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SeHCAT

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195: 26: 96: 344: 437:, one of the major natural bile acids in humans. It undergoes secretion into the biliary tree, gallbladder and intestine in response to food, and is reabsorbed efficiently in the ileum, with kinetics similar to natural bile acids. It was soon shown to be the most convenient and accurate method available to assess and measure 478:
is quoted at 5.3 mSv and annual background exposure in the UK 1-3 mSv.) Measurements were originally performed with a whole-body counter but are usually performed now with an uncollimated gamma camera. The patient is scanned supine or prone with anterior and posterior acquisition from head
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A capsule containing radiolabelled SeHCAT (with 370 kBq of Selenium-75 and less than 0.1 mg SeHCAT) is taken orally with water, to ensure passage of the capsule into the gastrointestinal tract. The physical half life of Se is approximately 118 days; activity is adjusted to a standard
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Patients may be given instructions to fast prior to capsule administration; there is significant variation in clinical practice in this regard. The effective dose of radiation for an adult given 370 kBq of SeHCAT is 0.26 mSv. (For comparison, the radiation exposure from an abdominal
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van Tilburg AJ, de Rooij FW, van den Berg JW, Kooij PP, van Blankenstein M (1991). "The selenium-75-homocholic acid taurine test reevaluated: combined measurement of fecal selenium-75 activity and 3 alpha-hydroxy bile acids in 211 patients".
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InChI=1S/C26H45NO7SSe/c1-15(13-36-14-23(31)27-8-9-35(32,33)34)18-4-5-19-24-20(12-22(30)26(18,19)3)25(2)7-6-17(28)10-16(25)11-21(24)29/h15-22,24,28-30H,4-14H2,1-3H3,(H,27,31)(H,32,33,34)/t15-,16+,17-,18-,19+,20+,21-,22+,24+,25+,26-/m1/s1
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From these measurements, the percent retention of SeHCAT at 7 days is calculated. A 7-day SeHCAT retention value greater than 15% is considered to be normal, with values less than 15% signifying excessive bile acid loss, as found in
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With more frequent measurements, it is possible to calculate SeHCAT retention whole-body half-life; this is not routinely measured in a clinical setting. A half-life of greater than 2.8 days has been quoted as normal.
426:. By incorporating the gamma-emitter Se into the SeHCAT molecule, the retention in the body or the loss of this compound into the feces could be studied easily using a standard gamma camera, available in most clinical 479:
to thigh 1 to 3 hours after taking the capsule. Scanning is repeated after 7 days. Background values are subtracted and care must be taken to avoid external sources of radiation in a nuclear medicine department.
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Jazrawi, RP; Ferraris, R; Bridges, C; Northfield, TC (1988). "Kinetics for the synthetic bile acid 75selenohomocholic acid-taurine in humans: comparison with taurocholate".
982:"Systematic review: the prevalence of idiopathic bile acid malabsorption as diagnosed by SeHCAT scanning in patients with diarrhoea-predominant irritable bowel syndrome" 937: 569:
patients. When these data were combined, 32% of 1223 patients had a SeHCAT 7-day retention of less than 10%, and 80% of these reported a response to cholestyramine, a
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Boyd, GS; Merrick, MV; Monks, R; Thomas, IL (1981). "Se-75-labeled bile acid analogs, new radiopharmaceuticals for investigating the enterohepatic circulation".
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of bile acids is reduced in these patients with ileal abnormalities and, as the normal bile acid retention exceeds 95%, only a small degree of change is needed.
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Shrimpton PC, Hillier MC, Lewis MA, Dunn M (December 2006). "National survey of doses from CT in the UK: 2003".
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Walters, JR (2010). "Defining primary bile acid diarrhea: making the diagnosis and recognizing the disorder".
511:, the 7-day SeHCAT retention usually is abnormal, and most of these patients will benefit from treatment with 683:"Assessment of ileal function by abdominal counting of the retention of a gamma emitting bile acid analogue" 551: 520: 500: 484: 392: 1074: 547: 512: 1738: 2103: 1708: 1635: 570: 38: 1828: 1754: 1749: 1668: 1313: 1175: 190: 441:
turnover in the intestine. SeHCAT testing was commercially developed by Amersham International Ltd (
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SeHCAT has been shown to be absorbed from the gut and excreted into the bile at the same rate as
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and other disorders affecting intestinal motility or digestion such as radiation enteritis,
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23-Seleno-25-homo-tauro-cholic acid; Selenium homocholic acid taurine; Tauroselcholic acid
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There have been at least 18 studies of the use of SeHCAT testing in diarrhea-predominant
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Smith, MJ; Perkins, AC (2013). "A Survey of the clinical use of SeHCAT in the UK".
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Wedlake, L; A'Hern, R; Russell, D; Thomas, K; Walters, JR; Andreyev, HJ (2009).
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Smith, MJ; Cherian, P; Raju, GS; Dawson, BF; Mahon, S; Bardhan, KD (2000).
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Thaysen, EH; Orholm, M; Arnfred, T; Carl, J; Rødbro, P (October 1982).
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Except where otherwise noted, data are given for materials in their
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The SeHCAT test is used to investigate patients with suspected
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Medical Diagnostics division) for clinical use to investigate
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C(CCC(NCCS(O)(=O)=O)=O)1()CC2()3()(O)C4()C(O)CC4(C)3()C(O)21C
178: 558:. These patients are frequently misdiagnosed as having the 352: 591:"23-seleno-25-homotaurocholic acid - Compound Summary" 900:
Journal of the Royal College of Physicians of London
1844: 1562: 1547: 1515: 1380: 1333: 1275: 1238: 1211: 1162: 1139: 1073: 938:Expert Review of Gastroenterology & Hepatology 896:"Bile acid malabsorption in persistent diarrhoea" 546:, an abnormal SeHCAT retention and a response to 391:) is a drug used in a clinical test to diagnose 140: 71: 42:(Se)-2-seleno]acetyl]amino]ethanesulfonic acid, 1045: 845:Nyhlin, H; Merrick, MV; Eastwood, MA (1994). 8: 1559: 1052: 1038: 1030: 986:Alimentary Pharmacology & Therapeutics 193: 115: 17: 997: 911: 870: 706: 160: 582: 239: 214: 189: 2049:Therapeutic radiopharmaceuticals (V10) 772:SeHCAT. SmPC 2008. GE Healthcare 1-7. 537:small intestinal bacterial overgrowth 221:Key: JCMLWGQJPSGGEI-HZAMXZRMSA-N 7: 323: 614: 612: 410:which was synthesized for use as a 131: 14: 381:23-seleno-25-homotaurocholic acid 999:10.1111/j.1365-2036.2009.04081.x 784:The British Journal of Radiology 385:selenium homocholic acid taurine 342: 287: 275: 269: 24: 403:SeHCAT is a taurine-conjugated 338:(at 25 °C , 100 kPa). 284: 278: 263: 1: 744:10.1097/MNM.0b013e32835e8989 660:10.1016/0016-5085(88)90306-x 2069:Diagnostic gastroenterology 820:Journal of Nuclear Medicine 621:Journal of Nuclear Medicine 2120: 556:primary bile acid diarrhea 1939: 1025:GE Healthcare SeHCAT site 523:can also be secondary to 517:enterohepatic circulation 503:, who usually experience 420:enterohepatic circulation 332: 306: 250: 230: 205: 55: 47: 37: 32: 23: 2094:Organoselenium compounds 567:irritable bowel syndrome 560:irritable bowel syndrome 2099:Selenium(−II) compounds 1775:Gallium (Ga) gozetotide 1324:Iodinated human albumin 552:bile acid malabsorption 521:Bile acid malabsorption 501:bile acid malabsorption 485:bile acid malabsorption 393:bile acid malabsorption 1075:Central nervous system 548:bile acid sequestrants 513:bile acid sequestrants 1709:Fludeoxyglucose (18F) 1636:Pittsburgh compound B 1277:Cardiovascular system 699:10.1136/gut.23.10.862 571:bile acid sequestrant 542:A similar picture of 2074:Radiopharmaceuticals 1755:Fluorothymidine F-18 1750:Fluoroestradiol F-18 1669:Desmethoxyfallypride 1176:Sodium iodohippurate 1062:radiopharmaceuticals 796:10.1259/bjr/93277434 1739:Fluorodeoxysorbitol 1483:Fluoroethyltyrosine 1422:Satumomab pendetide 863:10.1136/gut.35.1.90 412:radiopharmaceutical 389:tauroselcholic acid 302: g·mol 20: 1820:Piflufolastat F-18 1694:Flotufolastat F-18 1689:Flortaucipir (18F) 1507:Piflufolastat F-18 1478:Fluorodeoxyglucose 1417:Capromab pendetide 1240:Respiratory system 1130:Flutemetamol (18F) 365:Infobox references 18: 2056: 2055: 1935: 1934: 1829:Rubidium chloride 1795:N-Methylspiperone 1684:Florbetapir (18F) 1679:Florbetaben (18F) 1631:N-Methylspiperone 1462:Iobenguane (131I) 1449:Iobenguane (123I) 1314:Rubidium chloride 1126:Florbetapir (18F) 1106:Iofetamine (123I) 951:10.1586/egh.10.54 453:in patients with 373:Chemical compound 371: 370: 174:CompTox Dashboard 97:Interactive image 2111: 2079:Gastroenterology 1560: 1459: 1446: 1433: 1405:Hynic-octreotide 1213:Gastrointestinal 1111:Iolopride (123I) 1101:Ioflupane (123I) 1054: 1047: 1040: 1031: 1012: 1011: 1001: 977: 971: 970: 932: 926: 925: 915: 891: 885: 884: 874: 842: 836: 835: 814: 808: 807: 779: 773: 770: 764: 763: 727: 721: 720: 710: 678: 672: 671: 648:Gastroenterology 643: 637: 636: 616: 607: 606: 604: 602: 587: 544:chronic diarrhea 505:chronic diarrhea 470:reference date. 428:nuclear medicine 355: 349: 346: 345: 327: 301: 289: 286: 280: 277: 271: 265: 258:Chemical formula 198: 197: 182: 180: 164: 144: 133: 119: 99: 75: 28: 21: 2119: 2118: 2114: 2113: 2112: 2110: 2109: 2108: 2059: 2058: 2057: 2052: 2051: 2045: 1941:Isotopes used: 1931: 1840: 1551: 1543: 1538:Iodocholesterol 1511: 1488:Sodium fluoride 1457: 1444: 1431: 1376: 1329: 1271: 1234: 1207: 1158: 1141:Skeletal system 1135: 1069: 1058: 1021: 1016: 1015: 979: 978: 974: 934: 933: 929: 893: 892: 888: 844: 843: 839: 816: 815: 811: 790:(948): 968–80. 781: 780: 776: 771: 767: 732:Nuc. Med. Comms 729: 728: 724: 680: 679: 675: 645: 644: 640: 618: 617: 610: 600: 598: 589: 588: 584: 579: 525:cholecystectomy 509:Crohn's disease 497: 467: 445:is now part of 414:to investigate 401: 374: 367: 362: 361: 360:  ?) 351: 347: 343: 339: 316: 299: 283: 274: 268: 260: 246: 243: 238: 237: 226: 223: 222: 219: 213: 212: 201: 191:DTXSID601108465 183: 176: 167: 147: 134: 122: 102: 89: 78: 65: 51: 43: 12: 11: 5: 2117: 2115: 2107: 2106: 2101: 2096: 2091: 2086: 2081: 2076: 2071: 2061: 2060: 2054: 2053: 2046: 2044: 2043: 2038: 2033: 2031:technetium-99m 2028: 2023: 2018: 2013: 2008: 2003: 1998: 1993: 1988: 1983: 1978: 1973: 1968: 1963: 1958: 1953: 1948: 1942: 1940: 1937: 1936: 1933: 1932: 1930: 1929: 1924: 1919: 1914: 1909: 1904: 1899: 1894: 1889: 1884: 1879: 1874: 1869: 1863: 1861: 1842: 1841: 1839: 1838: 1832: 1822: 1817: 1807: 1802: 1797: 1792: 1787: 1782: 1777: 1772: 1767: 1762: 1757: 1752: 1747: 1742: 1736: 1731: 1721: 1716: 1706: 1701: 1696: 1691: 1686: 1681: 1676: 1671: 1666: 1661: 1660: 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Retrieved 594: 585: 564: 541: 498: 495:Clinical use 489: 481: 472: 468: 443:Amersham plc 432: 415: 402: 388: 384: 380: 376: 375: 56:Identifiers 48:Other names 15: 2026:selenium-75 2016:rubidium-82 2006:nitrogen-13 2001:krypton-81m 1966:fluorine-18 1951:chromium-51 1606:Carfentanil 1552:(including 1395:Arcitumomab 1361:Tilmanocept 1351:Exametazime 1294:Tetrofosmin 1087:Exametazime 1060:Diagnostic 857:(1): 90–3. 435:cholic acid 399:Development 251:Properties 2084:Bile acids 2063:Categories 2047:See also: 1996:iodine-131 1991:iodine-125 1986:iodine-123 1981:indium-111 1976:gallium-68 1971:gallium-67 1835:Setoperone 1760:Fluspidine 1745:Fluorodopa 1728:Altanserin 1719:Flumazenil 1674:Fallypride 1641:Raclopride 1626:Methionine 1621:Flumazenil 1592:(Cimbi-36) 1198:Mertiatide 595:CID 123829 577:References 424:bile salts 295:Molar mass 162:H6630PU5ZJ 108:ChemSpider 84:3D model ( 73:75018-71-2 63:CAS Number 39:IUPAC name 2041:xenon-133 2011:oxygen-15 1961:copper-64 1956:cobalt-57 1946:carbon-11 1846:gamma ray 1699:Flubatine 1646:Verapamil 1590:25B-NBOMe 1584:ME@HAPTHI 1400:Votumumab 1356:Sulesomab 1339:infection 1304:Imciromab 1289:Sestamibi 1116:Iomazenil 465:Procedure 439:bile acid 405:bile acid 2089:Cholanes 1715:analogue 1564:positron 1500:Dotatate 1008:19570102 967:27123642 959:20932141 922:11077656 804:17213302 760:28551810 752:23407368 529:vagotomy 455:diarrhea 328:) 314:ATC code 1713:glucose 1657:Ammonia 1601:Choline 1596:Acetate 1554:tracers 1217:Hepatic 913:9665518 881:8307458 872:1374639 832:2045936 717:7117906 708:1419815 668:3371611 633:7264761 601:3 April 476:CT scan 416:in vivo 358:what is 356: ( 322: ( 320:V09DX01 142:3086012 129:PubChem 117:2342733 19:SeHCAT 1850:photon 1800:Nifene 1785:Mefway 1711:(FDG)- 1458:  1445:  1432:  1262:Tc-MAA 1229:SeHCAT 1006:  965:  957:  920:  910:  879:  869:  830:  802:  758:  750:  715:  705:  666:  631:  597:. NCBI 535:, and 515:. The 408:analog 377:SeHCAT 353:verify 350:  300:594.68 235:SMILES 33:Names 1854:SPECT 1814:Water 1770:FMISO 1741:(FDS) 1382:Tumor 1164:Renal 963:S2CID 756:S2CID 387:, or 210:InChI 86:JSmol 1790:MPPF 1616:DTBZ 1611:DASB 1571:list 1187:ETS2 1004:PMID 955:PMID 918:PMID 877:PMID 828:PMID 800:PMID 748:PMID 713:PMID 664:PMID 629:PMID 603:2011 418:the 153:UNII 1805:FET 1568:PET 1066:V09 994:doi 947:doi 908:PMC 867:PMC 859:doi 851:Gut 792:doi 740:doi 703:PMC 695:doi 687:Gut 656:doi 422:of 325:WHO 179:EPA 132:CID 2065:: 1927:Xe 1922:Tl 1917:Tc 1912:Se 1907:Sm 1902:Kr 1882:In 1877:Ga 1872:Co 1867:Cr 1825:Rb 1780:Ga 1664:Cu 1532:/ 1495:Cu 1412:In 1390:Tc 1372:Ga 1367:In 1347:Tc 1310:Rb 1300:In 1285:Tc 1264:, 1258:Tc 1253:Kr 1248:Xe 1225:Se 1200:, 1194:Tc 1182:Cu 1149:Tc 1128:, 1089:, 1083:Tc 1002:. 990:30 988:. 984:. 961:. 953:. 941:. 916:. 904:34 902:. 898:. 875:. 865:. 855:35 853:. 849:. 824:32 822:. 798:. 788:79 786:. 754:. 746:. 736:34 734:. 711:. 701:. 691:23 689:. 685:. 662:. 652:95 650:. 625:22 623:. 611:^ 593:. 573:. 539:. 527:, 487:. 461:. 395:. 383:, 288:Se 273:45 267:26 1897:I 1892:I 1887:I 1860:) 1856:/ 1852:( 1848:/ 1837:) 1831:) 1827:( 1816:) 1812:( 1810:O 1730:) 1726:( 1724:F 1652:N 1648:) 1586:) 1582:( 1580:C 1573:) 1566:( 1556:) 1540:) 1536:( 1534:I 1530:I 1525:I 1468:F 1464:) 1460:( 1455:I 1451:) 1447:( 1442:I 1438:) 1434:( 1429:I 1363:) 1349:( 1337:/ 1326:) 1322:( 1320:I 1316:) 1312:( 1306:) 1302:( 1296:) 1287:( 1268:) 1260:( 1231:) 1227:( 1215:/ 1204:) 1196:( 1178:) 1174:( 1172:I 1155:) 1151:( 1132:) 1124:( 1122:F 1118:) 1099:( 1097:I 1093:) 1085:( 1068:) 1064:( 1053:e 1046:t 1039:v 1010:. 996:: 969:. 949:: 943:4 924:. 883:. 861:: 834:. 806:. 794:: 762:. 742:: 719:. 697:: 670:. 658:: 635:. 605:. 379:( 348:Y 285:S 282:7 279:O 276:N 270:H 264:C 181:) 177:( 88:)

Index


IUPAC name
CAS Number
75018-71-2
JSmol
Interactive image
ChemSpider
2342733
PubChem
3086012
UNII
H6630PU5ZJ
CompTox Dashboard
DTXSID601108465
Edit this at Wikidata
InChI
SMILES
Chemical formula
Molar mass
ATC code
V09DX01
WHO
standard state
verify
what is
Infobox references
bile acid malabsorption
bile acid
analog
radiopharmaceutical

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