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Bradycardia

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342:(AV node), another specialized grouping of cells located in the base of the right atrium, which is the only anatomically normal electrical connection between the atria and ventricles. Impulses coursing through the AV node are slowed before carrying on to the ventricles, allowing for appropriate filling of the ventricles before contraction. The SA and AV nodes are both closely regulated by the autonomic nervous system's fibres, allowing for adjustment of cardiac output by the central nervous system in times of increased metabolic demand. 527:, classically demonstrates grouped patterns of heartbeats on ECG. Throughout the group, the PR interval gradually lengthens until a dropped conduction occurs, resulting in no QRS complex seen on surface ECG following the last P wave. After a delay, the grouping repeats, with the PR interval shortening again to baseline. Type 1 2nd degree AV block due to disease in the AV node (as opposed to in the His-purkinje system) rarely needs intervention with pacemaker implantation. 53: 363: 1054: 473:, and tachycardia-bradycardia syndrome. These conditions can be caused by damage to the native sinus node itself and are frequently accompanied by damaged AV node conduction and reduced backup pacemaker activity. The condition can also be caused by dysfunction of the autonomic nervous system that regulates the node and is commonly exacerbated by medications. 486: 615:, about 61% take place at the bundle branch-Purkinje system, 21% at the AV node, and 15% at the bundle of His. AV block may be ruled out with an ECG indicating "a 1:1 relationship between P waves and QRS complexes." Ventricular bradycardias occurs with sinus bradycardia, sinus arrest, and AV block. Treatment often consists of the administration of 187:. In large population studies of adults without underlying heart disease, resting heart rates of 45-50 BPM appear to be the lower limits of normal, dependent on age and sex. Bradycardia is most likely to be discovered in the elderly, as age and underlying cardiac disease progression contribute to its development. 517:
conduction but are merely delayed. The location of the causal lesion can be anywhere between the AV node and the His-Purkinje system but is most commonly found in the AV node itself. Generally, isolated PR prolongation in 1st degree AV block is not associated with increased mortality or hospitalization.
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Bradycardia can also result from the inhibition of the flow of action potentials through the atrioventricular (AV) node. While this can be normal in young patients due to excessive vagus nerve tone, symptomatic bradycardia due to AV node dysfunction in older people is commonly due to structural heart
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Sinus arrhythmias are heart rhythm abnormalities characterized by variations in the cardiac cycle length over 120 milliseconds (longest cycle - shortest cycle). These are the most common type of arrhythmia in the general population and usually have no significant consequences. They typically occur in
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of less than 50 BPM. Cardiac action potentials are generated from the SA node and propagated through an otherwise normal conduction system, but they occur at a slow rate. It is a common condition found in both healthy individuals and those considered well-conditioned athletes. Studies have found that
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in excess of 200 milliseconds. The PR interval represents the length of time between the start of atrial depolarization and the start of ventricular depolarization, representing the flow of electrical impulses between the SA and AV nodes. Despite the term "block," no impulses are fully lost in this
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Respiratory sinus arrhythmia refers to the physiologically normal variation in heart rate due to breathing. During inspiration, vagus nerve activity decreases, reducing parasympathetic innervation of the sinoatrial node and causing an increase in heart rate. During expiration, heart rates fall due
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For infants, bradycardia is defined as a heart rate less than 100 BPM (normal is around 120–160 BPM). Premature babies are more likely than full-term babies to have apnea and bradycardia spells; their cause is not clearly understood. The spells may be related to centers inside the brain that
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may also occur when the electrical impulses from the SA node fail to reach the AV node because of SA or AV block. This is a protective mechanism for the heart to compensate for an SA node that is no longer handling the pacemaking activity and is one of a series of backup sites that can take over
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2nd degree, Mobitz type 2 AV block is another phenomenon of intermittently dropped QRS complexes after characteristic groupings of beats seen on surface ECG. The PR and RR intervals are consistent in this condition, followed by a sudden AV block and dropped QRS complex. Because type 2 blocks are
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With SA node dysfunction (sometimes called sick sinus syndrome), there may be disordered automaticity or impaired conduction of the impulse from the SA node into the surrounding atrial tissue (an "exit block"). Second-degree sinoatrial blocks can be detected only by use of a 12-lead ECG. It is
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Sinoatrial exit block is a similar non-respiratory phenomenon of temporarily lost sinoatrial impulses. However, in contrast to a sinus pause, the action potential is still generated at the SA node but is either unable to leave or delayed from leaving the node, preventing or delaying atrial
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A diagnosis of bradycardia in adults is based on a heart rate of less than 60 BPM, although some studies use a heart rate of less than 50 BPM. This is usually determined either by palpation or ECG. If symptoms occur, a determining electrolytes may help determine the underlying cause.
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depolarization and subsequent ventricular systole. Therefore, the length of the pause in heartbeats is usually a multiple of the P-P interval, as seen on electrocardiography. Like a sinus pause, a sinoatrial exit block can be symptomatic, especially with prolonged pause length.
1349:"2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society" 253:. In atrioventricular causes of bradycardia, permanent pacemaker implantation is often required when no reversible causes of disease are found. In both SND and atrioventricular blocks, there is little role for medical therapy unless a patient is 2880: 2865: 2850: 353:
that innervate myocardial tissue. The His-Purkinje system conducts action potentials much faster than can be propagated between myocardial cells, allowing the entire ventricular myocardium to contract in less time, improving pump function.
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Most pathological causes of bradycardia result from damage to this normal cardiac conduction system at various levels: the sinoatrial node, the atrioventricular node, or damage to conduction tissue between or after these nodes.
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difficult and sometimes impossible to assign a mechanism to any particular bradycardia, but the underlying mechanism is not clinically relevant to treatment, which is the same in both cases of sick sinus syndrome: a permanent
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until such time that an appropriate workup can be undertaken and long-term treatment selected. While asymptomatic bradycardias rarely require treatment, consultation with a physician is recommended, especially in the elderly.
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Menozzi C, Brignole M, Alboni P, Boni L, Paparella N, Gaggioli G, et al. (November 1998). "The natural course of untreated sick sinus syndrome and identification of the variables predictive of unfavorable outcome".
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in the AV node will produce a wide QRS complex with heart rates between 20 and 40 BPM. Those above the bundle of His, also known as junctional, will typically range between 40 and 60 BPM with a narrow QRS complex. In a
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regulate breathing which may not be fully developed. Touching the baby gently or rocking the incubator slightly will almost always get the baby to start breathing again, which increases the heart rate. The
591:. An AV-junctional escape complex is a normal response that may result from excessive vagal tone on the SA node. Pathological causes include sinus bradycardia, sinus arrest, sinus exit block, or AV block. 222:(SND), atrioventricular block, and other conduction tissue diseases. However, bradycardia can also result without dysfunction of the native conduction system, arising secondary to medications including 523:
is characterized by intermittently lost conduction of impulses between the SA node and the ventricles. 2nd degree block is classified into two types. Mobitz type 1 block, otherwise known by the eponym
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are divided into three categories, ranked by severity. AV block is diagnosed via surface ECG, which is usually sufficient to locate the causal lesion of the block without the need for an invasive
512:, electrical impulses originating in the SA node (or other ectopic focus above the ventricles) are conducted with significant delay through the AV node. This condition is diagnosed via ECG, with 602:, also known as atrioventricular bradycardia or ventricular escape rhythm, is a heart rate of less than 50 BPM. This is a safety mechanism when a lack of electrical impulse or stimuli from the 962:, can improve symptoms. If discontinuation of these medications is not possible due to clinical need, cardiac pacing can be considered with continuation of the medications. Beta blockers with 245:
The management of bradycardia is generally reserved for patients with symptoms, regardless of minimum heart rate during sleep or the presence of concomitant heart rhythm abnormalities (See:
724:) may result from impaired conduction in the AV node or anywhere below it, such as in the bundle of His. The clinical relevance pertaining to AV blocks is greater than that of SA blocks. 277:(CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation. 694:, or degenerative primary electrical disease. Ultimately, the causes act by three mechanisms: depressed automaticity of the heart, conduction block, or escape pacemakers and rhythms. 531:
typically due to lesions below the AV node, the ability for ventricular escape rhythms to maintain cardiac output is compromised. Permanent pacemaker implantation is often required.
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with hydralazine, prazosin, and anticholinergics and myocardial toxicity with sympathomimetics, as well as limited data for this indication, hinder their routine and long-term use.
3639: 249:), which are common with this condition. Untreated SND has been shown to increase the future risk of heart failure and syncope, sometimes warranting definitive treatment with an 416:
the young, athletes or after administration of medications such as morphine. The types of sinus arrhythmia are separated into the respiratory and non-respiratory categories.
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originates in the AV node and rapidly splits into a left and right branch, each destined for a different ventricle. Finally, these bundle branches terminate in the small
176:(BPM). While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 4051: 1754:
Sauer WH, Koplan BA (2022). "The Bradyarrhythmias: Disorders of the Atrioventricular Node". In Loscalzo J, Fauci AS, Kasper DL, Hauser S, Longo D, Jameson JL (eds.).
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Many heathy young adults, and particularly well-trained athletes, have sinus bradycardia that is without symptoms. This can include heart rates of less than 50 or 60
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Following slowed conduction through the atrioventricular node, the action potential produced initially at the SA node now flows through the His-Purkinje system. The
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Sauer WH, Koplan BA, Zei PC (2022). "Principles of Clinical Cardiac Electrophysiology". In Loscalzo J, Fauci AS, Kasper DL, Hauser S, Longo D, Jameson JL (eds.).
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Loscalzo J, Keaney JF, MacRae CA (2022). "Basic Biology of the Cardiovascular System". In Loscalzo J, Fauci AS, Kasper DL, Hauser S, Longo D, Jameson JL (eds.).
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50–85% of conditioned athletes have benign sinus bradycardia, as compared to 23% of the general population studied. The heart muscle of athletes has a higher
327:. The SA node contains pacemaker cells that demonstrate "automaticity" and can generate impulses that travel through the heart and create a steady heartbeat. 2753: 242:
are neurological causes of transient symptomatic bradycardia. Hypothyroidism and metabolic derangements are other common extrinsic causes of bradycardia.
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Temporal correlation of symptoms with bradycardia is necessary for diagnosis of symptomatic bradycardia. This can sometimes be difficult. Challenge with
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Rijnbeek PR, van Herpen G, Bots ML, Man S, Verweij N, Hofman A, et al. (2014). "Normal values of the electrocardiogram for ages 16-90 years".
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Treatment of chronic symptomatic bradycardia first necessitates correlation of symptoms. Once symptoms have been clearly linked to bradycardia,
3014: 1763: 1694: 1574: 1542: 1228: 304:, or heart muscle cells. Like most cells, cardiomyocytes maintain a highly regulated negative voltage at rest and are capable of propagating 4731: 3692: 3501: 3338: 520: 3506: 3496: 3085: 509: 308:, much like neurons. While at rest, the negative cellular voltage of a cardiomyocyte can be raised above a certain threshold (so-called 177: 407:, requiring fewer contractions to circulate the same volume of blood. Asymptomatic sinus bradycardia decreases in prevalence with age. 3803: 3634: 3248: 963: 273:
The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness.
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At the beginning of the cardiac cycle, the SA node generates an electrical action potential that spreads across the right and left
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Martin Brady holds the Guinness world record for the slowest heart rate, with a certified rate over a minute duration of 27 BPM.
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Daniel Green holds the world record for the slowest heartbeat in a healthy human, with a heart rate measured in 2014 of 26 BPM.
779: 3614: 3609: 3533: 680: 203: 3333: 441:. Sinus pause and arrest involve slowing or arresting of automatic impulse generation from the sinus node. This can lead to 2728: 998:. Doses less than 0.5 mg should not be used, which may further decrease the rate. If this is ineffective, intravenous 3960: 3836: 3765: 3597: 1959:
Ye F, Hatahet M, Youniss MA, Toklu HZ, Mazza JJ, Yale S (June 2018). "The Clinical Significance of Relative Bradycardia".
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due to reduced forward blood flow to the brain, lungs, and skeletal muscle. The types of symptoms often depend on the
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In clinical practice, elderly people over age 65 and young athletes of both sexes may have sinus bradycardia. The US
323:(SA node). This collection of specialized conduction tissue is located in the right atrium, near the entrance of the 3780: 3268: 3253: 4460: 3555: 1126: 3858: 3523: 3450: 3177: 959: 697:
In general, two types of problems result in bradycardias: disorders of the SA node and disorders of the AV node.
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In people who are unwilling to undergo pacemaker implantation or are not candidates for cardiac pacing, chronic
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reported in 2011 that 15.2% of adult males and 6.9% of adult females had clinically defined bradycardia (a
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Normally, the origination of the action potential causing cardiomyocyte contraction originates from the
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Kusumoto FM, Schoenfeld MH, Barrett C, Edgerton JR, Ellenbogen KA, Gold MR, et al. (August 2019).
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Franklin SM, Thihalolipavan S, Fontaine JM (May 2017). "Sinus Bradycardia in Habitual Cocaine Users".
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Resting heart rates of less than 50 BPM are often normal during sleep in young and healthy adults and
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Jaillon P (September 1990). "Relevance of intrinsic sympathomimetic activity for beta blockers".
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Ufberg JW, Clark JS (February 2006). "Bradydysrhythmias and atrioventricular conduction blocks".
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Aro AL, Anttonen O, Kerola T, Junttila MJ, Tikkanen JT, Rissanen HA, et al. (January 2014).
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de Caen AR, Berg MD, Chameides L, Gooden CK, Hickey RW, Scott HF, et al. (November 2015).
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Ling CA, Crouch MA (1998). "Theophylline for chronic symptomatic bradycardia in the elderly".
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Neumar RW, Otto CW, Link MS, Kronick SL, Shuster M, Callaway CW, et al. (November 2010).
2402: 2353: 2304: 2266: 2217: 2135: 2100: 2009: 1968: 1941: 1870: 1852: 1803: 1759: 1733: 1690: 1656: 1621: 1570: 1538: 1510: 1504: 1485: 1454: 1418: 1370: 1271: 1224: 1167: 974:, have less risk of bradycardia and may be useful as replacements of pure beta blockers, like 752: 434: 395: 145: 140: 128: 60: 4584: 4555: 4396: 4311: 4283: 4276: 4261: 4104: 4005: 3897: 3790: 3486: 2688: 2675:
Atkins DL, Berger S, Duff JP, Gonzales JC, Hunt EA, Joyner BL, et al. (November 2015).
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Northcote RJ (May 1987). "The clinical significance of intrinsic sympathomimetic activity".
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Douedi S, Mararenko A, Alshami A, Al-Azzawi M, Ajam F, Patel S, et al. (August 2021).
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Dominic P, Ahmad J, Awwab H, Bhuiyan MS, Kevil CG, Goeders NE, et al. (January 2022).
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Bonnet D, Martin D, Villain E, Jouvet P, Rabier D, Brivet M, et al. (November 1999).
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Clark BA, Prystowsky EN (December 2021). "Electrocardiography of Atrioventricular Block".
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Emergency treatment is not needed if the person is asymptomatic or minimally symptomatic.
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Bradycardia caused by the alterations of sinus node activity is divided into three types.
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A syndrome of intrinsic disease of the sinus node, referred to as sick sinus syndrome or
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of the slow heart rate, classified by the anatomic location of a dysfunction within the
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Sharma J, Rathnayaka N, Green C, Moeller FG, Schmitz JM, Shoham D, et al. (2016).
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pacemaker function when the SA node fails to do so. This would present with a longer
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The treatment of bradycardia depends on whether the person is stable or unstable.
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is present and is the cause of symptomatic bradycardia, symptoms respond well to
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has been suggested as a possible cause of this. In contrast to cocaine however,
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Patterson KK, Olgin JE (2022). "Bradyarrhythmias and Atrioventricular Block".
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and improves subjective symptoms in most people with bradycardia due to SND.
374:): The points on the heart where the ECG signals are measured are also shown. 4304: 1831:"Prognostic significance of prolonged PR interval in the general population" 764: 748: 744: 199: 2702: 2661: 2577: 2460: 2406: 2357: 2308: 2270: 2221: 2104: 2013: 1972: 1945: 1856: 1807: 1737: 1625: 1489: 1473: 1422: 1374: 1275: 1171: 1018:
may be required if the cause of the bradycardia is not rapidly reversible.
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If a person is unstable, the initial recommended treatment is intravenous
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An AV-junctional escape beat is a delayed heartbeat originating from an
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Ye F, Hatahet M, Youniss MA, Toklu HZ, Mazza JJ, Yale S (June 2018).
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Adams MG, Pelter MM (September 2003). "Ventricular escape rhythms".
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standard practice is to electronically monitor the heart and lungs.
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Characteristic ECGs of atrioventricular blocks, organized by degree.
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Miller MB (May 1998). "Arrhythmias associated with drug toxicity".
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Bryan G, Ward A, Rippe JM (April 1992). "Athletic heart syndrome".
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bpm. Such individuals, without symptoms, do not require treatment.
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Kurian T, Ambrosi C, Hucker W, Fedorov VV, Efimov IR (June 2010).
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can be provided to increase heart rate and symptoms will improve.
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Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine
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Non-respiratory causes of sinus arrhythmia include sinus pause,
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The heart is a specialized muscle containing repeating units of
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Design and Development of Medical Electronic Instrumentation
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In children, giving oxygen, supporting their breathing, and
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are also used in the treatment of acute bradycardia due to
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do not create backup sources of cardiac action potentials.
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Non-cardiac causes are usually secondary and can involve
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have also been used to treat bradycardia, including the
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disease, myocardial ischemia, or age-related fibrosis.
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Harwood-Nuss' Clinical Practice of Emergency Medicine
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Illustration comparing the ECGs of a healthy person (
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can induce or exacerbate bradycardia. These include
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may have many causes, both cardiac and non-cardiac.
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Treasure Island (FL): StatPearls Publishing. 946:that induce or exacerbate bradycardia, such as 790:has not been associated with bradyarrhythmias. 190:Bradycardia may be associated with symptoms of 2551:"The evaluation and management of bradycardia" 1749: 1747: 1560: 1558: 1556: 1554: 4059: 2964: 1873:. American Heart Association. 4 December 2008 1781: 1779: 1777: 1775: 8: 2151: 2149: 1390: 1388: 1386: 1384: 659:, metabolic or endocrine issues, especially 338:. This electrical impulse carries on to the 2428: 2426: 2424: 2422: 2420: 2418: 2416: 2085:Emergency Medicine Clinics of North America 1153: 1151: 1149: 1147: 1145: 1143: 683:, acute bradycardia can occur more rarely. 4560: 4384: 4066: 4052: 4044: 3580: 3460: 3300: 3281:Arrhythmogenic right ventricular dysplasia 3151: 2993: 2971: 2957: 2949: 2833: 1902:. Merck Sharp and Dohme Corp. January 2008 1756:Harrison's Principles of Internal Medicine 1567:Harrison's Principles of Internal Medicine 1535:Harrison's Principles of Internal Medicine 1086:Centers for Disease Control and Prevention 803:has been found to be a cause bradycardia. 778:use has been associated with bradycardia. 51: 34: 2692: 2651: 2450: 2396: 2347: 2260: 2211: 2003: 1900:The Merck Manuals: Online Medical Library 1846: 1727: 1615: 1412: 1364: 1265: 671:, situational factors, such as prolonged 1890: 1888: 1116:had a resting heart rate of 28 BPM. 1112:During his career, professional cyclist 686:Cardiac causes include acute or chronic 334:, causing the atrial contraction of the 2078: 2076: 1919: 1917: 1158:Hafeez Y, Grossman SA (9 August 2021). 1139: 3015:Spontaneous coronary artery dissection 1896:"Arrhythmias and Conduction Disorders" 1680: 1678: 1676: 1674: 1672: 1670: 1509:. John Wiley & Sons. p. 371. 1129: â€“ Processes which cause hypopnea 708:AV conduction disturbances (AV block; 238:drugs. Excess vagus nerve activity or 2549:Mangrum JM, DiMarco JP (March 2000). 1596:Pacing and Clinical Electrophysiology 1397:"Evaluating and managing bradycardia" 837:in people with bradycardia caused by 7: 3339:Nonbacterial thrombotic endocarditis 2734:from the original on 10 October 2022 2060:The Lecturio Medical Concept Library 1712:"Sinus Node and Atrial Arrhythmias" 280:The word "bradycardia" is from the 3635:Accelerated idioventricular rhythm 2725:National Health Statistics Reports 1439:The American Journal of Cardiology 1258:10.1016/j.jelectrocard.2014.07.022 964:intrinsic sympathomimetic activity 25: 2452:10.1161/CIRCULATIONAHA.110.970988 1926:American Journal of Critical Care 1788:Cardiac Electrophysiology Clinics 1729:10.1161/CIRCULATIONAHA.116.018011 1401:Trends in Cardiovascular Medicine 370:) and a person with bradycardia ( 27:Heart rate below the normal range 1608:10.1111/j.1540-8159.2010.02699.x 1395:Sidhu S, Marine JE (July 2020). 1052: 793:Bradycardia is also part of the 429:Non-respiratory sinus arrhythmia 75: 3320:Subacute bacterial endocarditis 2727:. Centers for Disease Control. 2322:Panneton WM (September 2013). 1758:(21st ed.). McGraw Hill. 1685:Allan B. Wolfson, ed. (2005). 1569:(21st ed.). McGraw Hill. 1537:(21st ed.). McGraw Hill. 681:fatty acid oxidation disorders 240:carotid sinus hypersensitivity 1: 3837:Pulseless electrical activity 3766:Multifocal atrial tachycardia 3640:Catecholaminergic polymorphic 2301:10.1016/j.amjcard.2017.02.018 2132:10.1016/s0733-8627(05)70009-2 1710:John RM, Kumar S (May 2016). 1653:10.1016/S0278-5919(20)30529-9 1451:10.1016/s0002-9149(98)00605-5 1293:. Rotterdam, The Netherlands. 880:adenosine receptor antagonist 570:. It occurs when the rate of 547:. This usually appears on an 46:Bradyarrhythmia, brachycardia 2805:Lovgren S (20 August 2004). 2694:10.1161/cir.0000000000000265 2644:10.1161/cir.0000000000000266 2605:10.1016/0002-9149(90)90758-s 2528:10.1016/0167-5273(87)90309-3 2253:10.1080/08964289.2014.897931 2192:Circ Arrhythm Electrophysiol 1366:10.1161/CIR.0000000000000628 1246:Journal of Electrocardiology 634:neonatal intensive-care unit 578:falls below the rate of the 420:Respiratory sinus arrhythmia 4732:Symptoms and signs: Cardiac 4694:superior vena cava syndrome 2570:10.1056/NEJM200003093421006 555:accompanied by an inverted 425:to the converse occurring. 4748: 3781:Wandering atrial pacemaker 3328:non-infective endocarditis 3269:Endocardial fibroelastosis 2340:10.1152/physiol.00020.2013 2005:10.1161/01.cir.100.22.2248 1800:10.1016/j.ccep.2021.07.001 1641:Clinics in Sports Medicine 960:potassium channel blockers 718:secondary type II AV block 690:, vascular heart disease, 447:ventricular escape rhythms 265:and interventions such as 4607:radial artery sufficiency 3859:hexaxial reference system 3804:Jervell and Lange-Nielsen 3334:Libman–Sacks endocarditis 2687:(18 Suppl 2): S519–S525. 2638:(18 Suppl 2): S526–S542. 2445:(18 Suppl 3): S729–S767. 2204:10.1161/CIRCEP.121.010273 2097:10.1016/j.emc.2005.08.006 1938:10.4037/ajcc2003.12.5.477 1414:10.1016/j.tcm.2019.07.001 714:secondary type I AV block 296:Normal cardiac conduction 275:Chronotropic incompetence 216:cardiac conduction system 155:15% (males), 7% (females) 59: 50: 4217:Pericardial friction rub 3739:Ventricular fibrillation 3010:Coronary artery aneurysm 2811:National Geographic News 1848:10.1093/eurheartj/eht176 1647:(2). Elsevier: 259–272. 952:calcium channel blockers 866:permanent cardiac pacing 819:bpm or even less than 40 741:calcium channel blockers 667:, neurological factors, 613:third-degree heart block 255:hemodynamically unstable 228:calcium channel blockers 4653:Nicoladoni–Branham sign 4317:Jugular venous pressure 4179:Pulmonary insufficiency 4016:Diastolic heart failure 3990:Athletic heart syndrome 3951:Ventricular hypertrophy 3685:Pre-excitation syndrome 3539:Left posterior fascicle 3064:Acute coronary syndrome 3004:Coronary artery disease 2120:Emerg Med Clin North Am 1503:Prutchi, David (2005). 956:sodium channel blockers 922:orthostatic hypotension 795:mammalian diving reflex 566:focus somewhere in the 503:electrophysiology study 499:Atrioventricular blocks 4542:Gallavardin phenomenon 4380:Cardiovascular disease 3534:Left anterior fascicle 3314:infective endocarditis 3099:Hibernating myocardium 2980:Cardiovascular disease 2784:Guinness World Records 2157:"What is Bradycardia?" 2031:"What is Bradycardia?" 1835:European Heart Journal 1032:sinus node dysfunction 910:sympathomimetic agents 892:antihypertensive agent 839:sinus node dysfunction 784:β-adrenergic receptors 692:valvular heart disease 688:ischemic heart disease 600:Idioventricular rhythm 494:Atrioventricular block 490: 463:sinus node dysfunction 457:Sinus node dysfunction 375: 220:sinus node dysfunction 178:atrioventricular block 4647:arteriovenous fistula 4461:Bracht–Wachter bodies 3698:Wolff–Parkinson–White 3658:Premature contraction 3556:Adams–Stokes syndrome 3259:Loeffler endocarditis 3069:Myocardial infarction 1127:Bezold–Jarisch reflex 1012:transcutaneous pacing 884:positive chronotropes 665:electrolyte imbalance 653:recreational drug use 488: 477:Atrioventricular node 445:or cardiac arrest if 439:sinoatrial exit block 365: 340:atrioventricular node 4484:Pericardial effusion 4389:Aortic insufficiency 4202:Mitral insufficiency 4184:Graham Steell murmur 3865:Right axis deviation 3827:Sudden cardiac death 3185:Pericardial effusion 3128:Ventricular aneurysm 2758:World Record Academy 1289:Rijnbeek PR (2012). 541:AV-junctional rhythm 267:transcutenous pacing 4417:Austin Flint murmur 4196:Carey Coombs murmur 3870:Left axis deviation 3727:Atrial fibrillation 3722:Ventricular flutter 3645:Torsades de pointes 3519:Bundle branch block 3478:Sick sinus syndrome 3264:Cardiac amyloidosis 3249:Tachycardia-induced 3104:Myocardial stunning 3052:Prinzmetal's angina 3021:Coronary thrombosis 2780:"Lowest heart rate" 1291:"Normal ECG values" 1160:"Sinus bradycardia" 1096:Society and culture 942:Discontinuation of 933:replacement therapy 521:2nd degree AV block 510:1st degree AV block 288:"slow", and κιρδίι 251:implanted pacemaker 4727:Cardiac arrhythmia 4688:Trendelenburg test 4621:pseudohypertension 4599:Right heart strain 4593:pulmonary embolism 4208:Presystolic murmur 4079:circulatory system 4075:Signs and symptoms 3973:Atrial enlargement 3771:Pacemaker syndrome 3693:Lown–Ganong–Levine 3615:Junctional ectopic 3610:AV nodal reentrant 3116:Myocardial rupture 3026:Coronary vasospasm 2923:External resources 2760:. 29 November 2014 2389:10.1002/joa3.12578 2056:"Bradyarrhythmias" 1090:resting pulse rate 1039:chest compressions 1016:Transvenous pacing 843:resting heart rate 753:cardiac glycosides 669:autonomic reflexes 535:Junctional rhythms 491: 376: 325:superior vena cava 170:resting heart rate 4714: 4713: 4710: 4709: 4673:Friedreich's sign 4580:Cardarelli's sign 4550: 4549: 4480:Cardiac tamponade 4272:Pulsus bisferiens 4162:Functional murmur 4041: 4040: 4033:Obstructive shock 3937: 3936: 3884:Short QT syndrome 3851:Other / ungrouped 3842:Sinoatrial arrest 3757:Ectopic pacemaker 3653: 3652: 3473:Sinus bradycardia 3445: 3444: 3441: 3440: 3190:Cardiac tamponade 3143: 3142: 3133:Dressler syndrome 3031:Myocardial bridge 2946: 2945: 2817:on 20 August 2004 2493:10.1345/aph.17463 2295:(10): 1611–1615. 1998:(22): 2248–2253. 1765:978-1-264-26850-4 1722:(19): 1892–1900. 1696:978-0-7817-5125-4 1576:978-1-264-26850-4 1544:978-1-264-26850-4 1445:(10): 1205–1209. 1230:978-0-323-82467-5 1082: 1081: 1041:are recommended. 990:Acute or unstable 857:Chronic or stable 833:can be used as a 722:tertiary AV block 549:electrocardiogram 396:Sinus bradycardia 391:Sinus bradycardia 306:action potentials 159: 158: 146:electrocardiogram 141:Diagnostic method 61:Sinus bradycardia 32:Medical condition 16:(Redirected from 4739: 4700:Pemberton's sign 4561: 4556:Vascular disease 4402:De Musset's sign 4397:Collapsing pulse 4385: 4284:Pulsus alternans 4277:Pulsus bigeminus 4262:Pulsus paradoxus 4077:relating to the 4068: 4061: 4054: 4045: 4006:Cardiac fibrosis 3898:T wave alternans 3791:Long QT syndrome 3585:Supraventricular 3581: 3514:Intraventricular 3461: 3301: 3152: 2997:Coronary disease 2994: 2973: 2966: 2959: 2950: 2834: 2827: 2826: 2824: 2822: 2813:. Archived from 2802: 2796: 2795: 2793: 2791: 2786:. 11 August 2005 2776: 2770: 2769: 2767: 2765: 2750: 2744: 2743: 2741: 2739: 2733: 2722: 2713: 2707: 2706: 2696: 2672: 2666: 2665: 2655: 2623: 2617: 2616: 2588: 2582: 2581: 2555: 2546: 2540: 2539: 2511: 2505: 2504: 2487:(7–8): 837–839. 2481:Ann Pharmacother 2476: 2465: 2464: 2454: 2430: 2411: 2410: 2400: 2368: 2362: 2361: 2351: 2319: 2313: 2312: 2284: 2275: 2274: 2264: 2232: 2226: 2225: 2215: 2183: 2172: 2171: 2169: 2167: 2153: 2144: 2143: 2115: 2109: 2108: 2080: 2071: 2070: 2068: 2066: 2052: 2046: 2045: 2043: 2041: 2027: 2018: 2017: 2007: 1983: 1977: 1976: 1956: 1950: 1949: 1921: 1912: 1911: 1909: 1907: 1892: 1883: 1882: 1880: 1878: 1867: 1861: 1860: 1850: 1826: 1820: 1819: 1783: 1770: 1769: 1751: 1742: 1741: 1731: 1707: 1701: 1700: 1682: 1665: 1664: 1636: 1630: 1629: 1619: 1587: 1581: 1580: 1562: 1549: 1548: 1530: 1521: 1520: 1500: 1494: 1493: 1469: 1463: 1462: 1433: 1427: 1426: 1416: 1392: 1379: 1378: 1368: 1359:(8): e382–e482. 1344: 1295: 1294: 1286: 1280: 1279: 1269: 1241: 1235: 1234: 1216: 1183: 1182: 1180: 1178: 1155: 1077: 1074: 1056: 1049: 1014:should be used. 970:activity), like 906:anticholinergics 835:diagnostic agent 822: 818: 761:alpha-2 agonists 710:primary AV block 467:sinoatrial block 411:Sinus arrhythmia 174:beats per minute 119: 118: 115: 114: 111: 108: 105: 102: 99: 96: 93: 90: 87: 84: 81: 55: 35: 21: 4747: 4746: 4742: 4741: 4740: 4738: 4737: 4736: 4717: 4716: 4715: 4706: 4683:Kussmaul's sign 4659: 4574:aortic aneurysm 4546: 4518:Anitschkow cell 4511:rheumatic fever 4498: 4465: 4426: 4407:Duroziez's sign 4374: 4335: 4288: 4238: 4111: 4081: 4072: 4042: 4037: 4028:Rheumatic fever 3994: 3933: 3846: 3813: 3785: 3743: 3702: 3679: 3649: 3621: 3568: 3560: 3454: 3437: 3345: 3294: 3285: 3201: 3195:Hemopericardium 3139: 3080: 3074:Unstable angina 3047:Angina pectoris 3040:Active ischemia 3035: 2983: 2977: 2947: 2942: 2941: 2918: 2917: 2845: 2831: 2830: 2820: 2818: 2804: 2803: 2799: 2789: 2787: 2778: 2777: 2773: 2763: 2761: 2752: 2751: 2747: 2737: 2735: 2731: 2720: 2715: 2714: 2710: 2674: 2673: 2669: 2625: 2624: 2620: 2590: 2589: 2585: 2564:(10): 703–709. 2553: 2548: 2547: 2543: 2513: 2512: 2508: 2478: 2477: 2468: 2432: 2431: 2414: 2370: 2369: 2365: 2321: 2320: 2316: 2286: 2285: 2278: 2234: 2233: 2229: 2185: 2184: 2175: 2165: 2163: 2155: 2154: 2147: 2117: 2116: 2112: 2082: 2081: 2074: 2064: 2062: 2054: 2053: 2049: 2039: 2037: 2029: 2028: 2021: 1985: 1984: 1980: 1958: 1957: 1953: 1923: 1922: 1915: 1905: 1903: 1894: 1893: 1886: 1876: 1874: 1869: 1868: 1864: 1828: 1827: 1823: 1785: 1784: 1773: 1766: 1753: 1752: 1745: 1709: 1708: 1704: 1697: 1684: 1683: 1668: 1638: 1637: 1633: 1589: 1588: 1584: 1577: 1564: 1563: 1552: 1545: 1532: 1531: 1524: 1517: 1502: 1501: 1497: 1471: 1470: 1466: 1435: 1434: 1430: 1394: 1393: 1382: 1346: 1345: 1298: 1288: 1287: 1283: 1243: 1242: 1238: 1231: 1218: 1217: 1186: 1176: 1174: 1157: 1156: 1141: 1136: 1123: 1114:Miguel Indurain 1103: 1098: 1092:below 60 BPM). 1078: 1072: 1069: 1062:needs expansion 1047: 1020:Methylxanthines 992: 968:partial agonist 937:thyroid hormone 914:beta-1 agonists 899:alpha-1 blocker 859: 851: 820: 816: 809: 788:methamphetamine 780:Desensitization 642: 629: 597: 537: 496: 479: 459: 431: 422: 413: 393: 385: 360: 351:Purkinje fibers 321:sinoatrial node 298: 166:bradyarrhythmia 123: 78: 74: 33: 28: 23: 22: 18:Slow heart rate 15: 12: 11: 5: 4745: 4743: 4735: 4734: 4729: 4719: 4718: 4712: 4711: 4708: 4707: 4705: 4704: 4703: 4702: 4690: 4685: 4680: 4675: 4669: 4667: 4661: 4660: 4658: 4657: 4656: 4655: 4643: 4638: 4637: 4636: 4624: 4617: 4616: 4615: 4603: 4602: 4601: 4589: 4588: 4587: 4582: 4569: 4567: 4558: 4552: 4551: 4548: 4547: 4545: 4544: 4539: 4538: 4537: 4525: 4520: 4515: 4506: 4504: 4500: 4499: 4497: 4496: 4491: 4475: 4473: 4467: 4466: 4464: 4463: 4458: 4452:Janeway lesion 4449: 4437: 4435: 4428: 4427: 4425: 4424: 4419: 4414: 4409: 4404: 4399: 4393: 4391: 4382: 4376: 4375: 4373: 4372: 4370:Template:Shock 4366: 4361: 4356: 4351: 4345: 4343: 4337: 4336: 4334: 4333: 4331: 4326: 4325: 4324: 4322:Cannon A waves 4314: 4309: 4308: 4307: 4296: 4294: 4290: 4289: 4287: 4286: 4281: 4280: 4279: 4274: 4264: 4259: 4254: 4248: 4246: 4240: 4239: 4237: 4236: 4235: 4234: 4224: 4219: 4214: 4213: 4212: 4211: 4210: 4198: 4193: 4188: 4187: 4186: 4181: 4171: 4170: 4169: 4167:Still's murmur 4164: 4149: 4148: 4147: 4142: 4137: 4132: 4121: 4119: 4113: 4112: 4110: 4109: 4108: 4107: 4097: 4091: 4089: 4083: 4082: 4073: 4071: 4070: 4063: 4056: 4048: 4039: 4038: 4036: 4035: 4030: 4025: 4024: 4023: 4021:Cardiac asthma 4018: 4008: 4002: 4000: 3996: 3995: 3993: 3992: 3987: 3986: 3985: 3980: 3970: 3969: 3968: 3963: 3958: 3947: 3945: 3939: 3938: 3935: 3934: 3932: 3931: 3929:Strain pattern 3926: 3925: 3924: 3919: 3914: 3902: 3901: 3900: 3888: 3887: 3886: 3874: 3873: 3872: 3867: 3854: 3852: 3848: 3847: 3845: 3844: 3839: 3834: 3829: 3823: 3821: 3819:Cardiac arrest 3815: 3814: 3812: 3811: 3806: 3801: 3799:Andersen–Tawil 3795: 3793: 3787: 3786: 3784: 3783: 3778: 3773: 3768: 3763: 3753: 3751: 3745: 3744: 3742: 3741: 3736: 3735: 3734: 3724: 3719: 3717:Atrial flutter 3713: 3711: 3704: 3703: 3701: 3700: 3695: 3689: 3687: 3681: 3680: 3678: 3677: 3672: 3667: 3661: 3659: 3655: 3654: 3651: 3650: 3648: 3647: 3642: 3637: 3631: 3629: 3623: 3622: 3620: 3619: 3618: 3617: 3612: 3602: 3601: 3600: 3589: 3587: 3578: 3562: 3561: 3559: 3558: 3553: 3552: 3551: 3546: 3541: 3536: 3531: 3526: 3516: 3511: 3510: 3509: 3504: 3499: 3489: 3480: 3475: 3469: 3467: 3458: 3447: 3446: 3443: 3442: 3439: 3438: 3436: 3435: 3434: 3433: 3428: 3416: 3415: 3414: 3409: 3397: 3396: 3395: 3390: 3378: 3377: 3376: 3371: 3366: 3353: 3351: 3347: 3346: 3344: 3343: 3342: 3341: 3336: 3324: 3323: 3322: 3309: 3307: 3298: 3287: 3286: 3284: 3283: 3278: 3277: 3276: 3271: 3266: 3261: 3256: 3251: 3246: 3241: 3240: 3239: 3227:Cardiomyopathy 3224: 3223: 3222: 3220:Chagas disease 3211: 3209: 3203: 3202: 3200: 3199: 3198: 3197: 3192: 3182: 3181: 3180: 3171: 3160: 3158: 3149: 3145: 3144: 3141: 3140: 3138: 3137: 3136: 3135: 3130: 3120: 3119: 3118: 3108: 3107: 3106: 3101: 3090: 3088: 3082: 3081: 3079: 3078: 3077: 3076: 3071: 3061: 3060: 3059: 3054: 3043: 3041: 3037: 3036: 3034: 3033: 3028: 3023: 3018: 3012: 3007: 3000: 2998: 2991: 2985: 2984: 2978: 2976: 2975: 2968: 2961: 2953: 2944: 2943: 2940: 2939: 2927: 2926: 2924: 2920: 2919: 2916: 2915: 2904: 2877: 2862: 2846: 2841: 2840: 2838: 2837:Classification 2829: 2828: 2797: 2771: 2745: 2708: 2667: 2618: 2599:(9): 21C–23C. 2583: 2541: 2522:(2): 133–150. 2506: 2466: 2412: 2383:(4): 888–892. 2363: 2334:(5): 284–297. 2314: 2276: 2227: 2198:(1): e010273. 2173: 2145: 2126:(2): 405–417. 2110: 2072: 2047: 2019: 1978: 1951: 1932:(5): 477–478. 1913: 1884: 1862: 1841:(2): 123–129. 1821: 1794:(4): 599–605. 1771: 1764: 1743: 1702: 1695: 1666: 1631: 1602:(6): 754–762. 1582: 1575: 1550: 1543: 1522: 1515: 1495: 1464: 1428: 1407:(5): 265–272. 1380: 1296: 1281: 1252:(6): 914–921. 1236: 1229: 1184: 1138: 1137: 1135: 1132: 1131: 1130: 1122: 1119: 1118: 1117: 1110: 1107: 1102: 1099: 1097: 1094: 1080: 1079: 1059: 1057: 1046: 1043: 991: 988: 929:hypothyroidism 858: 855: 850: 847: 808: 805: 661:hypothyroidism 641: 638: 628: 625: 621:cardiac pacing 596: 593: 572:depolarization 551:with a normal 536: 533: 495: 492: 478: 475: 458: 455: 430: 427: 421: 418: 412: 409: 392: 389: 384: 381: 359: 358:Classification 356: 310:depolarization 302:cardiomyocytes 297: 294: 232:antiarrythmics 164:, also called 157: 156: 153: 149: 148: 143: 137: 136: 131: 125: 124: 122: 121: 71: 69: 65: 64: 57: 56: 48: 47: 44: 40: 39: 31: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 4744: 4733: 4730: 4728: 4725: 4724: 4722: 4701: 4698: 4697: 4696: 4695: 4691: 4689: 4686: 4684: 4681: 4679: 4678:Caput medusae 4676: 4674: 4671: 4670: 4668: 4666: 4662: 4654: 4651: 4650: 4649: 4648: 4644: 4642: 4639: 4635: 4634:Lines of Zahn 4632: 4631: 4630: 4629: 4625: 4623: 4622: 4618: 4614: 4611: 4610: 4609: 4608: 4604: 4600: 4597: 4596: 4595: 4594: 4590: 4586: 4585:Oliver's sign 4583: 4581: 4578: 4577: 4576: 4575: 4571: 4570: 4568: 4566: 4562: 4559: 4557: 4553: 4543: 4540: 4536: 4533: 4532: 4531: 4530: 4526: 4524: 4521: 4519: 4516: 4514: 4512: 4508: 4507: 4505: 4501: 4495: 4492: 4490: 4487: 4485: 4481: 4477: 4476: 4474: 4472: 4468: 4462: 4459: 4457: 4453: 4450: 4448: 4445: 4443: 4439: 4438: 4436: 4434: 4429: 4423: 4420: 4418: 4415: 4413: 4412:MĂźller's sign 4410: 4408: 4405: 4403: 4400: 4398: 4395: 4394: 4392: 4390: 4386: 4383: 4381: 4377: 4371: 4367: 4365: 4362: 4360: 4357: 4355: 4352: 4350: 4347: 4346: 4344: 4342: 4338: 4332: 4330: 4327: 4323: 4320: 4319: 4318: 4315: 4313: 4312:Cœur en sabot 4310: 4306: 4303: 4302: 4301: 4298: 4297: 4295: 4291: 4285: 4282: 4278: 4275: 4273: 4270: 4269: 4268: 4265: 4263: 4260: 4258: 4255: 4253: 4250: 4249: 4247: 4245: 4241: 4233: 4230: 4229: 4228: 4225: 4223: 4220: 4218: 4215: 4209: 4206: 4205: 4204: 4203: 4199: 4197: 4194: 4192: 4189: 4185: 4182: 4180: 4177: 4176: 4175: 4172: 4168: 4165: 4163: 4160: 4159: 4158: 4155: 4154: 4153: 4150: 4146: 4145:Gallop rhythm 4143: 4141: 4138: 4136: 4133: 4131: 4128: 4127: 4126: 4123: 4122: 4120: 4118: 4114: 4106: 4105:Levine's sign 4103: 4102: 4101: 4098: 4096: 4095:Referred pain 4093: 4092: 4090: 4088: 4084: 4080: 4076: 4069: 4064: 4062: 4057: 4055: 4050: 4049: 4046: 4034: 4031: 4029: 4026: 4022: 4019: 4017: 4014: 4013: 4012: 4011:Heart failure 4009: 4007: 4004: 4003: 4001: 3997: 3991: 3988: 3984: 3981: 3979: 3976: 3975: 3974: 3971: 3967: 3964: 3962: 3959: 3957: 3954: 3953: 3952: 3949: 3948: 3946: 3944: 3940: 3930: 3927: 3923: 3922:ST depression 3920: 3918: 3915: 3913: 3910: 3909: 3908: 3907: 3903: 3899: 3896: 3895: 3894: 3893: 3889: 3885: 3882: 3881: 3880: 3879: 3875: 3871: 3868: 3866: 3863: 3862: 3861: 3860: 3856: 3855: 3853: 3849: 3843: 3840: 3838: 3835: 3833: 3830: 3828: 3825: 3824: 3822: 3820: 3816: 3810: 3807: 3805: 3802: 3800: 3797: 3796: 3794: 3792: 3788: 3782: 3779: 3777: 3774: 3772: 3769: 3767: 3764: 3762: 3758: 3755: 3754: 3752: 3750: 3746: 3740: 3737: 3733: 3730: 3729: 3728: 3725: 3723: 3720: 3718: 3715: 3714: 3712: 3710: 3705: 3699: 3696: 3694: 3691: 3690: 3688: 3686: 3682: 3676: 3673: 3671: 3668: 3666: 3663: 3662: 3660: 3656: 3646: 3643: 3641: 3638: 3636: 3633: 3632: 3630: 3628: 3624: 3616: 3613: 3611: 3608: 3607: 3606: 3603: 3599: 3596: 3595: 3594: 3591: 3590: 3588: 3586: 3582: 3579: 3576: 3572: 3567: 3563: 3557: 3554: 3550: 3549:Trifascicular 3547: 3545: 3542: 3540: 3537: 3535: 3532: 3530: 3527: 3525: 3522: 3521: 3520: 3517: 3515: 3512: 3508: 3505: 3503: 3500: 3498: 3495: 3494: 3493: 3490: 3488: 3484: 3481: 3479: 3476: 3474: 3471: 3470: 3468: 3466: 3462: 3459: 3457: 3452: 3448: 3432: 3431:regurgitation 3429: 3427: 3424: 3423: 3422: 3421: 3417: 3413: 3412:regurgitation 3410: 3408: 3405: 3404: 3403: 3402: 3398: 3394: 3393:regurgitation 3391: 3389: 3386: 3385: 3384: 3383: 3379: 3375: 3374:regurgitation 3372: 3370: 3367: 3365: 3362: 3361: 3360: 3359: 3355: 3354: 3352: 3348: 3340: 3337: 3335: 3332: 3331: 3330: 3329: 3325: 3321: 3318: 3317: 3316: 3315: 3311: 3310: 3308: 3306: 3302: 3299: 3297: 3292: 3288: 3282: 3279: 3275: 3272: 3270: 3267: 3265: 3262: 3260: 3257: 3255: 3252: 3250: 3247: 3245: 3242: 3238: 3235: 3234: 3233: 3230: 3229: 3228: 3225: 3221: 3218: 3217: 3216: 3213: 3212: 3210: 3208: 3204: 3196: 3193: 3191: 3188: 3187: 3186: 3183: 3179: 3175: 3172: 3170: 3167: 3166: 3165: 3162: 3161: 3159: 3157: 3153: 3150: 3146: 3134: 3131: 3129: 3126: 3125: 3124: 3121: 3117: 3114: 3113: 3112: 3109: 3105: 3102: 3100: 3097: 3096: 3095: 3092: 3091: 3089: 3087: 3083: 3075: 3072: 3070: 3067: 3066: 3065: 3062: 3058: 3057:Stable angina 3055: 3053: 3050: 3049: 3048: 3045: 3044: 3042: 3038: 3032: 3029: 3027: 3024: 3022: 3019: 3016: 3013: 3011: 3008: 3005: 3002: 3001: 2999: 2995: 2992: 2990: 2986: 2981: 2974: 2969: 2967: 2962: 2960: 2955: 2954: 2951: 2938: 2934: 2933: 2929: 2928: 2925: 2921: 2914: 2910: 2909: 2905: 2903: 2899: 2895: 2891: 2887: 2886: 2882: 2878: 2876: 2872: 2871: 2867: 2863: 2861: 2857: 2856: 2852: 2848: 2847: 2844: 2839: 2835: 2816: 2812: 2808: 2801: 2798: 2785: 2781: 2775: 2772: 2759: 2755: 2749: 2746: 2730: 2726: 2719: 2712: 2709: 2704: 2700: 2695: 2690: 2686: 2682: 2678: 2671: 2668: 2663: 2659: 2654: 2649: 2645: 2641: 2637: 2633: 2629: 2622: 2619: 2614: 2610: 2606: 2602: 2598: 2594: 2587: 2584: 2579: 2575: 2571: 2567: 2563: 2559: 2552: 2545: 2542: 2537: 2533: 2529: 2525: 2521: 2517: 2516:Int J Cardiol 2510: 2507: 2502: 2498: 2494: 2490: 2486: 2482: 2475: 2473: 2471: 2467: 2462: 2458: 2453: 2448: 2444: 2440: 2436: 2429: 2427: 2425: 2423: 2421: 2419: 2417: 2413: 2408: 2404: 2399: 2394: 2390: 2386: 2382: 2378: 2374: 2367: 2364: 2359: 2355: 2350: 2345: 2341: 2337: 2333: 2329: 2325: 2318: 2315: 2310: 2306: 2302: 2298: 2294: 2290: 2283: 2281: 2277: 2272: 2268: 2263: 2258: 2254: 2250: 2246: 2242: 2238: 2231: 2228: 2223: 2219: 2214: 2209: 2205: 2201: 2197: 2193: 2189: 2182: 2180: 2178: 2174: 2162: 2158: 2152: 2150: 2146: 2141: 2137: 2133: 2129: 2125: 2121: 2114: 2111: 2106: 2102: 2098: 2094: 2091:(1): 1–9, v. 2090: 2086: 2079: 2077: 2073: 2061: 2057: 2051: 2048: 2036: 2032: 2026: 2024: 2020: 2015: 2011: 2006: 2001: 1997: 1993: 1989: 1982: 1979: 1974: 1970: 1966: 1962: 1955: 1952: 1947: 1943: 1939: 1935: 1931: 1927: 1920: 1918: 1914: 1901: 1897: 1891: 1889: 1885: 1872: 1866: 1863: 1858: 1854: 1849: 1844: 1840: 1836: 1832: 1825: 1822: 1817: 1813: 1809: 1805: 1801: 1797: 1793: 1789: 1782: 1780: 1778: 1776: 1772: 1767: 1761: 1757: 1750: 1748: 1744: 1739: 1735: 1730: 1725: 1721: 1717: 1713: 1706: 1703: 1698: 1692: 1688: 1681: 1679: 1677: 1675: 1673: 1671: 1667: 1662: 1658: 1654: 1650: 1646: 1642: 1635: 1632: 1627: 1623: 1618: 1613: 1609: 1605: 1601: 1597: 1593: 1586: 1583: 1578: 1572: 1568: 1561: 1559: 1557: 1555: 1551: 1546: 1540: 1536: 1529: 1527: 1523: 1518: 1516:9780471681830 1512: 1508: 1507: 1499: 1496: 1491: 1487: 1483: 1479: 1475: 1468: 1465: 1460: 1456: 1452: 1448: 1444: 1440: 1432: 1429: 1424: 1420: 1415: 1410: 1406: 1402: 1398: 1391: 1389: 1387: 1385: 1381: 1376: 1372: 1367: 1362: 1358: 1354: 1350: 1343: 1341: 1339: 1337: 1335: 1333: 1331: 1329: 1327: 1325: 1323: 1321: 1319: 1317: 1315: 1313: 1311: 1309: 1307: 1305: 1303: 1301: 1297: 1292: 1285: 1282: 1277: 1273: 1268: 1263: 1259: 1255: 1251: 1247: 1240: 1237: 1232: 1226: 1222: 1215: 1213: 1211: 1209: 1207: 1205: 1203: 1201: 1199: 1197: 1195: 1193: 1191: 1189: 1185: 1173: 1169: 1165: 1161: 1154: 1152: 1150: 1148: 1146: 1144: 1140: 1133: 1128: 1125: 1124: 1120: 1115: 1111: 1108: 1105: 1104: 1100: 1095: 1093: 1091: 1087: 1076: 1073:December 2018 1067: 1063: 1060:This section 1058: 1055: 1051: 1050: 1044: 1042: 1040: 1035: 1033: 1029: 1028:aminophylline 1025: 1021: 1017: 1013: 1009: 1005: 1001: 997: 989: 987: 985: 981: 977: 973: 969: 965: 961: 957: 953: 949: 948:beta blockers 945: 940: 938: 934: 930: 925: 923: 919: 915: 911: 907: 903: 900: 896: 893: 889: 885: 881: 877: 874: 869: 867: 862: 856: 854: 848: 846: 844: 840: 836: 832: 829: 824: 813: 806: 804: 802: 798: 796: 791: 789: 785: 781: 777: 772: 770: 766: 762: 758: 754: 750: 746: 742: 738: 734: 733:beta blockers 730: 727:A variety of 725: 723: 719: 715: 711: 706: 704: 698: 695: 693: 689: 684: 682: 678: 674: 670: 666: 662: 658: 654: 649: 647: 639: 637: 635: 626: 624: 622: 618: 614: 609: 608:bundle of His 605: 601: 594: 592: 590: 585: 581: 577: 573: 569: 565: 560: 558: 554: 550: 546: 542: 534: 532: 528: 526: 522: 518: 515: 511: 506: 504: 500: 493: 487: 483: 476: 474: 472: 468: 464: 456: 454: 450: 448: 444: 440: 436: 428: 426: 419: 417: 410: 408: 406: 405:stroke volume 401: 397: 390: 388: 382: 380: 373: 369: 364: 357: 355: 352: 348: 347:bundle of His 343: 341: 337: 336:cardiac cycle 333: 328: 326: 322: 317: 315: 311: 307: 303: 295: 293: 291: 287: 283: 278: 276: 271: 268: 264: 263:isoproterenol 260: 256: 252: 248: 243: 241: 237: 233: 229: 225: 224:beta blockers 221: 217: 213: 209: 205: 201: 197: 193: 188: 186: 181: 179: 175: 171: 167: 163: 154: 150: 147: 144: 142: 138: 135: 132: 130: 126: 117: 73: 72: 70: 68:Pronunciation 66: 62: 58: 54: 49: 45: 41: 36: 30: 19: 4692: 4645: 4641:Adson's sign 4626: 4619: 4613:Allen's test 4605: 4591: 4572: 4527: 4523:Aschoff body 4509: 4494:Ewart's sign 4489:Beck's triad 4478: 4456:Osler's node 4442:endocarditis 4440: 4422:Mayne's sign 4368:See further 4364:Distributive 4300:Palpitations 4266: 4256: 4200: 4152:Heart murmur 4125:Heart sounds 4117:Auscultation 3943:Cardiomegaly 3917:ST elevation 3904: 3890: 3876: 3857: 3761:Ectopic beat 3709:fibrillation 3544:Bifascicular 3464: 3418: 3399: 3380: 3356: 3326: 3312: 3305:Endocarditis 3244:Hypertrophic 3178:Constrictive 3164:Pericarditis 3122: 3110: 3093: 2930: 2906: 2879: 2864: 2849: 2819:. Retrieved 2815:the original 2810: 2800: 2788:. Retrieved 2783: 2774: 2762:. Retrieved 2757: 2748: 2736:. Retrieved 2724: 2711: 2684: 2680: 2670: 2635: 2631: 2621: 2596: 2593:Am J Cardiol 2592: 2586: 2561: 2558:N Engl J Med 2557: 2544: 2519: 2515: 2509: 2484: 2480: 2442: 2438: 2380: 2376: 2366: 2331: 2327: 2317: 2292: 2289:Am J Cardiol 2288: 2244: 2240: 2230: 2195: 2191: 2164:. Retrieved 2160: 2123: 2119: 2113: 2088: 2084: 2063:. Retrieved 2059: 2050: 2038:. Retrieved 2034: 1995: 1991: 1981: 1967:(2): 73–78. 1964: 1960: 1954: 1929: 1925: 1904:. Retrieved 1899: 1875:. Retrieved 1865: 1838: 1834: 1824: 1791: 1787: 1755: 1719: 1715: 1705: 1686: 1644: 1640: 1634: 1599: 1595: 1585: 1566: 1534: 1505: 1498: 1484:(2): 73–78. 1481: 1477: 1467: 1442: 1438: 1431: 1404: 1400: 1356: 1352: 1284: 1249: 1245: 1239: 1220: 1175:. Retrieved 1163: 1083: 1070: 1066:adding to it 1061: 1045:Epidemiology 1036: 1024:theophylline 993: 941: 926: 918:side effects 876:theophylline 870: 863: 860: 852: 831:theophylline 825: 814: 810: 799: 792: 773: 726: 707: 699: 696: 685: 677:autoimmunity 650: 644:Bradycardia 643: 630: 598: 561: 538: 529: 519: 514:PR intervals 507: 497: 480: 471:sinus arrest 460: 451: 435:sinus arrest 432: 423: 414: 400:sinus rhythm 394: 386: 377: 371: 367: 344: 329: 318: 299: 289: 285: 279: 272: 244: 234:, and other 206:, and frank 189: 182: 165: 161: 160: 29: 4471:Pericardium 4447:Roth's spot 4433:endocardium 4359:Hypovolemic 4354:Obstructive 4349:Cardiogenic 4257:Bradycardia 4252:Tachycardia 4222:Heart click 3809:Romano–Ward 3776:Parasystole 3675:Ventricular 3627:Ventricular 3566:Tachycardia 3483:Heart block 3465:Bradycardia 3291:Endocardium 3254:Restrictive 3215:Myocarditis 3156:Pericardium 2937:Bradycardia 2821:8 September 2738:15 December 2681:Circulation 2632:Circulation 2439:Circulation 1992:Circulation 1906:16 December 1877:15 December 1716:Circulation 1353:Circulation 1267:1887/117357 1164:StatPearls 1008:epinephrine 976:propranolol 944:medications 916:. However, 895:hydralazine 888:vasodilator 737:propranolol 729:medications 595:Ventricular 589:PR interval 584:dysrhythmia 568:AV junction 553:QRS complex 247:Sinus pause 236:cholinergic 162:Bradycardia 43:Other names 38:Bradycardia 4721:Categories 4329:Hyperaemia 4191:Continuous 4087:Chest pain 3707:Flutter / 3670:Junctional 3605:Junctional 3598:Multifocal 3571:paroxysmal 3487:Sinoatrial 3456:arrhythmia 3451:Conduction 3207:Myocardium 2932:Patient UK 2377:J Arrhythm 2328:Physiology 2247:(1): 1–8. 1177:16 January 1134:References 1002:infusion ( 984:metoprolol 849:Management 646:arrhythmia 545:sinus node 525:Wenckebach 383:Sinus node 134:Cardiology 4305:Apex beat 4174:Diastolic 3966:Pulmonary 3749:Pacemaker 3420:pulmonary 3401:tricuspid 3237:Alcoholic 2241:Behav Med 1816:239091592 807:Diagnosis 765:clonidine 749:diltiazem 745:verapamil 703:pacemaker 627:Infantile 292:"heart". 204:confusion 200:dizziness 172:under 60 152:Frequency 129:Specialty 4628:thrombus 4565:Arterial 4157:Systolic 4130:Split S2 3832:Asystole 3732:Familial 3426:stenosis 3407:stenosis 3388:stenosis 3369:stenosis 3364:prolapse 3086:Sequelae 2989:Ischemia 2790:5 August 2764:5 August 2729:Archived 2703:26472999 2662:26473000 2578:10706901 2461:20956224 2407:34386113 2358:23997188 2309:28341362 2271:24621090 2222:34961335 2105:16308110 2014:10577999 1973:30048576 1946:14503433 1857:23677846 1808:34689889 1738:27166347 1626:20180918 1490:30048576 1423:31311698 1375:30586772 1276:25194872 1172:29630253 1121:See also 1004:dopamine 1000:inotrope 996:atropine 980:atenolol 972:pindolol 902:prazosin 801:COVID-19 774:Chronic 673:bed rest 617:atropine 443:asystole 314:contract 259:atropine 212:etiology 185:athletes 4267:doubled 4232:carotid 3232:Dilated 3174:Chronic 2982:(heart) 2913:D001919 2653:6191296 2613:1977302 2536:2884187 2501:9681101 2398:8339085 2349:3768097 2262:4162850 2213:8766923 2140:9621850 1661:1591784 1617:2889145 1459:9832095 1101:Records 1034:(SND). 966:(i.e., 920:, like 776:cocaine 769:lithium 757:digoxin 582:. This 580:AV node 576:SA node 574:of the 564:ectopic 284:βραδύς 208:syncope 196:dyspnea 192:fatigue 168:, is a 4665:Venous 4535:J wave 4431:Other 4100:Angina 3912:J wave 3665:Atrial 3593:Atrial 3382:aortic 3358:mitral 3350:Valves 3296:valves 3148:Layers 3017:(SCAD) 2902:779.81 2890:427.81 2860:MC81.1 2701:  2660:  2650:  2611:  2576:  2534:  2499:  2459:  2405:  2395:  2356:  2346:  2307:  2269:  2259:  2220:  2210:  2166:5 July 2138:  2103:  2065:5 July 2040:5 July 2012:  1971:  1944:  1855:  1814:  1806:  1762:  1736:  1693:  1659:  1624:  1614:  1573:  1541:  1513:  1488:  1457:  1421:  1373:  1274:  1227:  1170:  982:, and 958:, and 908:, and 897:, the 821:  817:  767:, and 675:, and 640:Causes 604:atrium 557:P wave 437:, and 372:bottom 290:kardia 286:bradys 120: 4503:Other 4341:Shock 4293:Other 4244:Pulse 4227:Bruit 3999:Other 3983:Right 3961:Right 3575:sinus 3524:Right 3274:Viral 3169:Acute 3123:weeks 3094:hours 3006:(CAD) 2898:785.9 2894:659.7 2875:R00.1 2732:(PDF) 2721:(PDF) 2554:(PDF) 2161:WebMD 2035:WebMD 1812:S2CID 1022:like 1010:) or 935:with 912:like 878:, an 763:like 755:like 743:like 735:like 663:, an 657:abuse 398:is a 332:atria 282:Greek 3978:Left 3956:Left 3573:and 3529:Left 3111:days 2908:MeSH 2885:9-CM 2823:2014 2792:2015 2766:2015 2740:2018 2699:PMID 2658:PMID 2609:PMID 2574:PMID 2532:PMID 2497:PMID 2457:PMID 2403:PMID 2354:PMID 2305:PMID 2267:PMID 2218:PMID 2168:2021 2136:PMID 2101:PMID 2067:2021 2042:2021 2010:PMID 1969:PMID 1942:PMID 1908:2009 1879:2009 1853:PMID 1804:PMID 1760:ISBN 1734:PMID 1691:ISBN 1657:PMID 1622:PMID 1571:ISBN 1539:ISBN 1511:ISBN 1486:PMID 1455:PMID 1419:PMID 1371:PMID 1272:PMID 1225:ISBN 1179:2022 1168:PMID 1026:and 890:and 873:oral 828:oral 747:and 619:and 261:and 4529:EKG 2881:ICD 2866:ICD 2851:ICD 2689:doi 2685:132 2648:PMC 2640:doi 2636:132 2601:doi 2566:doi 2562:342 2524:doi 2489:doi 2447:doi 2443:122 2393:PMC 2385:doi 2344:PMC 2336:doi 2297:doi 2293:119 2257:PMC 2249:doi 2208:PMC 2200:doi 2128:doi 2093:doi 2000:doi 1996:100 1965:117 1961:WMJ 1934:doi 1843:doi 1796:doi 1724:doi 1720:133 1649:doi 1612:PMC 1604:doi 1482:117 1478:WMJ 1447:doi 1409:doi 1361:doi 1357:140 1262:hdl 1254:doi 1068:. 927:If 782:of 655:or 539:An 508:In 368:top 104:ɑːr 4723:: 4140:S4 4135:S3 3906:ST 3878:QT 3759:/ 3507:3° 3502:2° 3497:1° 3492:AV 3485:: 3176:/ 2935:: 2911:: 2900:, 2896:, 2892:, 2888:: 2873:: 2870:10 2858:: 2855:11 2809:. 2782:. 2756:. 2723:. 2697:. 2683:. 2679:. 2656:. 2646:. 2634:. 2630:. 2607:. 2597:66 2595:. 2572:. 2560:. 2556:. 2530:. 2520:15 2518:. 2495:. 2485:32 2483:. 2469:^ 2455:. 2441:. 2437:. 2415:^ 2401:. 2391:. 2381:37 2379:. 2375:. 2352:. 2342:. 2332:28 2330:. 2326:. 2303:. 2291:. 2279:^ 2265:. 2255:. 2245:42 2243:. 2239:. 2216:. 2206:. 2196:15 2194:. 2190:. 2176:^ 2159:. 2148:^ 2134:. 2124:16 2122:. 2099:. 2089:24 2087:. 2075:^ 2058:. 2033:. 2022:^ 2008:. 1994:. 1990:. 1963:. 1940:. 1930:12 1928:. 1916:^ 1898:. 1887:^ 1851:. 1839:35 1837:. 1833:. 1810:. 1802:. 1792:13 1790:. 1774:^ 1746:^ 1732:. 1718:. 1714:. 1669:^ 1655:. 1645:11 1643:. 1620:. 1610:. 1600:33 1598:. 1594:. 1553:^ 1525:^ 1480:. 1476:. 1453:. 1443:82 1441:. 1417:. 1405:30 1403:. 1399:. 1383:^ 1369:. 1355:. 1351:. 1299:^ 1270:. 1260:. 1250:47 1248:. 1187:^ 1162:. 1142:^ 1006:, 986:. 978:, 954:, 950:, 939:. 904:, 797:. 759:, 751:, 739:, 720:, 716:, 712:, 705:. 623:. 505:. 469:, 230:, 226:, 202:, 198:, 194:, 180:. 4513:: 4486:: 4482:/ 4454:/ 4444:: 4067:e 4060:t 4053:v 3892:T 3577:) 3569:( 3453:/ 3293:/ 2972:e 2965:t 2958:v 2883:- 2868:- 2853:- 2843:D 2825:. 2794:. 2768:. 2742:. 2705:. 2691:: 2664:. 2642:: 2615:. 2603:: 2580:. 2568:: 2538:. 2526:: 2503:. 2491:: 2463:. 2449:: 2409:. 2387:: 2360:. 2338:: 2311:. 2299:: 2273:. 2251:: 2224:. 2202:: 2170:. 2142:. 2130:: 2107:. 2095:: 2069:. 2044:. 2016:. 2002:: 1975:. 1948:. 1936:: 1910:. 1881:. 1859:. 1845:: 1818:. 1798:: 1768:. 1740:. 1726:: 1699:. 1663:. 1651:: 1628:. 1606:: 1579:. 1547:. 1519:. 1492:. 1461:. 1449:: 1425:. 1411:: 1377:. 1363:: 1278:. 1264:: 1256:: 1233:. 1181:. 1075:) 1071:( 116:/ 113:ə 110:i 107:d 101:k 98:ˈ 95:ÉŞ 92:d 89:ĂŚ 86:r 83:b 80:ˌ 77:/ 20:)

Index

Slow heart rate

Sinus bradycardia
/ˌbrædɪˈkɑːrdiə/
Specialty
Cardiology
Diagnostic method
electrocardiogram
resting heart rate
beats per minute
atrioventricular block
athletes
fatigue
dyspnea
dizziness
confusion
syncope
etiology
cardiac conduction system
sinus node dysfunction
beta blockers
calcium channel blockers
antiarrythmics
cholinergic
carotid sinus hypersensitivity
Sinus pause
implanted pacemaker
hemodynamically unstable
atropine
isoproterenol

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