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Ectopic pacemaker

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151:. In a normal heart beat rhythm, the SA node usually suppresses the ectopic pacemaker activity due to the higher impulse rate of the SA node. However, in the instance of either a malfunctioning SA node or an ectopic focus bearing an intrinsic rate superior to SA node rate, ectopic pacemaker activity may take over the natural heart rhythm. This phenomenon (an intrinsically slower pacemaker activity being unmasked by failure of faster pacemaker tissue 'upstream') is called an escape rhythm, the lower rhythm having escaped from the dominance of the upper rhythm. As a rule, premature ectopic beats (i.e. with a shorter than the prevailing preceding R-R' interval) indicate increased myocyte or conducting tissue excitability, whereas late ectopic beats (i.e. with a prolonged preceding R-R' interval) indicate proximal pacemaker or conduction failure with an escape 'ectopic' beat. 273:. When an ectopic pacemaker initiates a beat, premature contraction occurs. A premature contraction will not follow the normal signal transduction pathway, and can render the heart refractory or incapable of transmitting the normal signal from the SA node. Location of the pacemaker can also change its effect on the SA node and its rhythm. An ectopic pacemaker located in the atria is known as an atrial pacemaker and can cause the atrial contraction to be faster. An ectopic pacemaker situated near the 51: 301:
will be abnormally shaped when looking at ventricular ectopic activity, often it occurs earlier with an absent P wave. It can be perceived as a skipped beat on both the ECG and through normal pulse-taking. During atrial ectopic activity where the P wave is normally rounded can be inverted or peaked.
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Isolated ectopic beats frequently cause no symptoms, although the most common symptom is the perception of a 'missed beat'. This occurs because the person notices the prolonged gap between the early (ectopic) beat and the next normal
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However the QRS complex and T waves appear relatively normal. Conversely, during junctional ectopic activity the P wave is frequently absent or can be hidden in the QRS complex.
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Hoogaars, Willem M.H.; Engel, Angela; Brons, Janynke F.; Verkerk, Arie O.; de Lange, Frederik J.; Wong, L.Y. Elaine; Bakker, Martijn L.; Clout, Danielle E.; et al. (2007).
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is known as a junctional pacemaker. The pacemaker that is operating in the ventricles is known as the ventricular. Other such ectopic pacemakers can even lie within the
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Haghjoo, Majid (2007). "Efficacy, safety, and role of segmental superior vena cava isolation in the treatment of atrial fibrillation".
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Keller-Wood, Maureen. "Electrical Activity in the Heart." Lecture at the University of Florida College of Pharmacy, 23-Oct-2007.
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Tveito, Aslak; Lines, Glenn T. (2008). "A condition for setting off ectopic waves in computational models of excitable cells".
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Tan, Alex Y.; Zhou, Shengmei; Jung, Byung Chun; Ogawa, Masahiro; Chen, Lan S.; Fishbein, Michael C.; Chen, Peng-Sheng (2008).
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Ectopic pacemakers can occur within healthy hearts in response to various stimulating events, they can be caused by
1670: 1158: 1143: 192: 1445: 1748: 1413: 1340: 1067: 1698: 1872: 1628: 1418: 1315: 1296: 1126: 899: 148: 517:"Ectopic activity in the rat pulmonary vein can arise from simultaneous activation ofα1- andβ1-adrenoceptors" 1905: 1879: 1867: 1855: 1840: 1574: 1516: 1320: 1301: 953: 893: 846: 795:"Ectopic atrial arrhythmias arising from canine thoracic veins during in vivo stellate ganglia stimulation" 1494: 1460: 1403: 1381: 1203: 1185: 1121: 988: 941: 869: 1258: 1253: 1148: 958: 1754: 1282: 1263: 1163: 1074: 1017: 177: 116: 1759: 1616: 1611: 1534: 1438: 1408: 1367: 993: 910: 469: 1862: 1660: 1482: 1433: 1058: 1005: 915: 132: 86: 429:
Rozanski, GJ (1991). "Atrial ectopic pacemaker escape mediated by phasic vagal nerve activity".
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Hamilton, S. D.; Bartley, T. D.; Miller, R. H.; Schiebler, G. L.; Marriott, H. J. L. (1968).
139:. Acute occurrence is usually non-life-threatening, but chronic occurrence can progress into 1895: 1787: 1680: 1376: 814: 806: 767: 635: 627: 616:"Tbx3 controls the sinoatrial node gene program and imposes pacemaker function on the atria" 586: 536: 528: 438: 398: 361: 1917: 1309: 1290: 1277: 1084: 963: 350:"Paroxysmal Atrial Tachycardia with Block Around the Ectopic Pacemaker: Report of a Case" 1910: 1818: 1716: 1708: 1606: 1116: 1109: 1096: 819: 794: 771: 640: 615: 541: 516: 311: 282: 266: 207: 63: 442: 1937: 1900: 1811: 946: 236: 221: 1832: 1806: 1650: 1598: 1271: 1247: 1217: 1194: 1063: 1053: 217: 136: 242:
SA node dysfunction (1st degree block) which can cause the rate of impulse to slow
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Maupoil, V; Bronquard, C; Freslon, J-L; Cosnay, P; Findlay, I (2007).
1801: 1781: 936: 278: 224:(high concentration of potassium/calcium), causing random excitation. 124: 494:(7th ed.). Lippincott Williams & Wilkins. p. 588. 842: 294: 466:"Atrial Fibrillation – information, symptoms and treatment" 424: 422: 420: 228:
They can also occur within unhealthy hearts, caused by:
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SA node blockage so that impulses never leave the atria
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An ectopic pacemaker can reside within a part of the
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ECG Interpretation: An Incredibly Easy! Pocket Guide
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ECG Interpretation: An Incredibly Easy! Pocket Guide
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ECG Interpretation: An Incredibly Easy! Pocket Guide
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Bupa. Archived from 93:Isolated ectopic beats 1588:Wolff–Parkinson–White 1548:Premature contraction 1446:Adams–Stokes syndrome 1149:Loeffler endocarditis 959:Myocardial infarction 667:"Wandering pacemaker" 1755:Right axis deviation 1717:Sudden cardiac death 1075:Pericardial effusion 1018:Ventricular aneurysm 729:"Atrial tachycardia" 437:(5 Pt 2): H1507–14. 117:premature heart beat 1760:Left axis deviation 1617:Atrial fibrillation 1612:Ventricular flutter 1535:Torsades de pointes 1409:Bundle branch block 1368:Sick sinus syndrome 1154:Cardiac amyloidosis 1139:Tachycardia-induced 994:Myocardial stunning 942:Prinzmetal's angina 911:Coronary thrombosis 348:Phibbs, B. (1963). 1944:Cardiac arrhythmia 1863:Atrial enlargement 1661:Pacemaker syndrome 1583:Lown–Ganong–Levine 1505:Junctional ectopic 1500:AV nodal reentrant 1006:Myocardial rupture 916:Coronary vasospasm 632:10.1101/gad.416007 248:AV node blockage ( 239:and atrial defects 155:Signs and symptoms 1931: 1930: 1923:Obstructive shock 1827: 1826: 1774:Short QT syndrome 1741:Other / ungrouped 1732:Sinoatrial arrest 1647:Ectopic pacemaker 1543: 1542: 1363:Sinus bradycardia 1335: 1334: 1331: 1330: 1080:Cardiac tamponade 1033: 1032: 1023:Dressler syndrome 921:Myocardial bridge 742:978-1-58255-701-4 711:978-1-58255-701-4 680:978-1-58255-701-4 501:978-0-7817-4988-6 235:Disease, such as 129:cardiac pacemaker 109:ectopic pacemaker 105: 104: 76:Electrophysiology 60:papillary muscles 36:Ectopic pacemaker 30:Medical condition 27:Cardiac condition 16:(Redirected from 1951: 1896:Cardiac fibrosis 1788:T wave alternans 1681:Long QT syndrome 1475:Supraventricular 1471: 1404:Intraventricular 1351: 1191: 1042: 887:Coronary disease 884: 863: 856: 849: 840: 833: 832: 822: 790: 784: 783: 753: 747: 746: 725: 716: 715: 694: 685: 684: 663: 654: 653: 643: 611: 605: 604: 594: 570: 564: 561: 555: 554: 544: 512: 506: 505: 487: 481: 480: 478: 477: 461: 455: 454: 426: 415: 414: 386: 380: 379: 369: 345: 250:3rd degree block 184:Increased local 111:, also known as 53: 33: 21: 1959: 1958: 1954: 1953: 1952: 1950: 1949: 1948: 1934: 1933: 1932: 1927: 1918:Rheumatic fever 1884: 1823: 1736: 1703: 1675: 1633: 1592: 1569: 1539: 1511: 1458: 1450: 1344: 1327: 1235: 1184: 1175: 1091: 1085:Hemopericardium 1029: 970: 964:Unstable angina 937:Angina pectoris 930:Active ischemia 925: 873: 867: 837: 836: 792: 791: 787: 755: 754: 750: 743: 727: 726: 719: 712: 696: 695: 688: 681: 665: 664: 657: 626:(9): 1098–112. 613: 612: 608: 572: 571: 567: 562: 558: 514: 513: 509: 502: 489: 488: 484: 475: 473: 463: 462: 458: 428: 427: 418: 388: 387: 383: 347: 346: 335: 330: 308: 291: 259: 174: 157: 135:, producing an 127:. 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314: 312:Cardiac ectopy 307: 304: 290: 287: 283:pulmonary vein 258: 255: 254: 253: 246: 243: 240: 233: 226: 225: 210: 208:catecholamines 196: 189: 173: 170: 169: 168: 165: 162: 156: 153: 103: 102: 101: 100: 97: 94: 89: 83: 82: 73: 67: 66: 64:left ventricle 55: 54: 46: 45: 42: 38: 37: 29: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1956: 1945: 1942: 1941: 1939: 1924: 1921: 1919: 1916: 1912: 1909: 1907: 1904: 1903: 1902: 1901:Heart failure 1899: 1897: 1894: 1893: 1891: 1887: 1881: 1878: 1874: 1871: 1869: 1866: 1865: 1864: 1861: 1857: 1854: 1852: 1849: 1847: 1844: 1843: 1842: 1839: 1838: 1836: 1834: 1830: 1820: 1817: 1813: 1812:ST depression 1810: 1808: 1805: 1803: 1800: 1799: 1798: 1797: 1793: 1789: 1786: 1785: 1784: 1783: 1779: 1775: 1772: 1771: 1770: 1769: 1765: 1761: 1758: 1756: 1753: 1752: 1751: 1750: 1746: 1745: 1743: 1739: 1733: 1730: 1728: 1725: 1723: 1720: 1718: 1715: 1714: 1712: 1710: 1706: 1700: 1697: 1695: 1692: 1690: 1687: 1686: 1684: 1682: 1678: 1672: 1669: 1667: 1664: 1662: 1659: 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1766: 1747: 1651:Ectopic beat 1646: 1599:fibrillation 1434:Bifascicular 1308: 1289: 1270: 1246: 1216: 1202: 1195:Endocarditis 1134:Hypertrophic 1068:Constrictive 1054:Pericarditis 1012: 1000: 983: 802: 798: 788: 763: 757: 751: 732: 701: 670: 623: 619: 609: 585:(1): 73–81. 582: 578: 568: 559: 524: 520: 510: 491: 485: 474:. Retrieved 470:the original 459: 434: 430: 394: 390: 384: 357: 353: 292: 260: 227: 218:hyperkalemic 178:automaticity 175: 164:Palpitations 137:ectopic beat 112: 108: 106: 99:Palpitations 1699:Romano–Ward 1666:Parasystole 1565:Ventricular 1517:Ventricular 1456:Tachycardia 1373:Heart block 1355:Bradycardia 1181:Endocardium 1144:Restrictive 1105:Myocarditis 1046:Pericardium 579:Circulation 354:Circulation 299:QRS complex 145:bradycardia 141:tachycardia 41:Other names 1597:Flutter / 1560:Junctional 1495:Junctional 1488:Multifocal 1461:paroxysmal 1377:Sinoatrial 1346:arrhythmia 1341:Conduction 1097:Myocardium 476:2009-02-04 328:References 271:ventricles 257:Physiology 80:Cardiology 1856:Pulmonary 1639:Pacemaker 1310:pulmonary 1291:tricuspid 1127:Alcoholic 289:Diagnosis 232:Infection 204:digitalis 191:Elevated 71:Specialty 1938:Category 1722:Asystole 1622:Familial 1316:stenosis 1297:stenosis 1278:stenosis 1259:stenosis 1254:prolapse 976:Sequelae 879:Ischemia 829:18539751 780:17599474 650:17473172 601:11712295 551:17325650 411:18539188 376:14079200 306:See also 277:and the 214:Ischemia 212:Cardiac 200:caffeine 188:activity 131:that is 87:Symptoms 1122:Dilated 1064:Chronic 872:(heart) 820:2519231 641:1855235 542:2013875 451:2035673 275:AV node 133:ectopic 123:of the 121:SA node 62:in the 1802:J wave 1555:Atrial 1483:Atrial 1272:aortic 1248:mitral 1240:Valves 1186:valves 1038:Layers 907:(SCAD) 827:  817:  778:  739:  708:  677:  648:  638:  599:  549:  539:  498:  449:  409:  374:  297:, the 293:On an 279:septum 206:, and 195:output 1889:Other 1873:Right 1851:Right 1465:sinus 1414:Right 1164:Viral 1059:Acute 1013:weeks 984:hours 896:(CAD) 267:atria 172:Cause 161:beat. 125:heart 1868:Left 1846:Left 1463:and 1419:Left 1001:days 825:PMID 776:PMID 737:ISBN 706:ISBN 675:ISBN 646:PMID 597:PMID 547:PMID 496:ISBN 447:PMID 407:PMID 372:PMID 815:PMC 807:doi 803:295 768:doi 636:PMC 628:doi 587:doi 537:PMC 529:doi 525:150 439:doi 435:260 399:doi 395:213 362:doi 295:ECG 269:or 220:or 147:or 107:An 1940:: 1796:ST 1768:QT 1649:/ 1397:3° 1392:2° 1387:1° 1382:AV 1375:: 1066:/ 823:. 813:. 801:. 797:. 774:. 764:40 762:. 731:. 720:^ 700:. 689:^ 669:. 658:^ 644:. 634:. 624:21 622:. 618:. 595:. 583:38 581:. 577:. 545:. 535:. 523:. 519:. 445:. 433:. 419:^ 405:. 393:. 370:. 358:28 356:. 352:. 336:^ 202:, 143:, 78:, 1782:T 1467:) 1459:( 1343:/ 1183:/ 862:e 855:t 848:v 831:. 809:: 782:. 770:: 745:. 714:. 683:. 652:. 630:: 603:. 589:: 553:. 531:: 504:. 479:. 453:. 441:: 413:. 401:: 378:. 364:: 20:)

Index

Ectopic focus

papillary muscles
left ventricle
Specialty
Electrophysiology
Cardiology
Symptoms
premature heart beat
SA node
heart
cardiac pacemaker
ectopic
ectopic beat
tachycardia
bradycardia
ventricular fibrillation
automaticity
parasympathetic nervous system
sympathetic nervous system
caffeine
digitalis
catecholamines
Ischemia
hyperkalemic
hypercalcemic
sinus venosus
3rd degree block
electrical conduction system of the heart
atria

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