Abstract:
:His bundle electrograms of 40 patients developing Wenckebach block during atrial pacing and four with spontaneous Wenckebach block above the His were reviewed to determine the frequency of classical Wenckebach periodicity. Thirty patients had 143 Wenckebach cycles that were suitable for analysis. Cycles were evaluated for the following features: 1) the first A-H interval as the shortest, 2) the first R-R interval as the longest, 3) the last R-R interval as the shortest, 4) a progressive diminution of the increment of A-H interval prolongation, 5) a progressive diminution of the R-R interval and 6) the R-R interval containing the nonconducted A wave being equal to twice the A-A interval less the sum of the increments of A-H prolongation. Wenckebach cycles that occurred during atrial pacing were not significantly different from those that occurred spontaneously. Fifteen per cent of all cycles met all six criteria- 14% had five, 6% had four; 17% had three; 20% had two; 27% had one; and 1% had none. Short cycles were the most likely to show typical Wenckebach periodicity: 56% of the cycles with conduction ratios of 4:3, 28% with 5:4 and 4% with 6:5 met at least five criteria, whereas none of the 22 cycles having ratios 7:6 or greater had more than three features. The first A-H interval as the shortest was the most common feature occurring in 98% of cycles, whereas the features of a progressive diminution of the increments of the A-H interval prolongation or the progressive diminution of the R-R interval were the least common, occurring in 35% of cycles. These findings indicate, therefore, that classical Wenckebach periodicity is uncommon, especially when conduction ratios are 5:4 or greater. The implications of these observations and the suggested mechanisms are discussed and literature reviewed.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Friedman HS,Gomes JA,Haft JIdoi
10.1016/s0022-0736(75)80003-3keywords:
subject
Has Abstractpub_date
1975-01-01 00:00:00pages
307-15issue
4eissn
0022-0736issn
1532-8430journal_volume
8pub_type
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journal_title:Journal of electrocardiology
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pub_type: 杂志文章
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journal_title:Journal of electrocardiology
pub_type: 杂志文章,评审
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更新日期:2004-01-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2012.06.006
更新日期:2012-11-01 00:00:00
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pub_type: 杂志文章,多中心研究
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pub_type: 杂志文章
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
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更新日期:1977-04-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章,评审
doi:10.1016/j.jelectrocard.2006.05.017
更新日期:2006-10-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
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更新日期:1975-01-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
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更新日期:1981-01-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 临床试验,杂志文章
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更新日期:2015-07-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0022-0736(94)80091-x
更新日期:1994-01-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(00)80096-5
更新日期:2000-01-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2004.04.008
更新日期:2004-07-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2020.02.016
更新日期:2020-01-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/s0022-0736(95)80055-7
更新日期:1995-01-01 00:00:00
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更新日期:2012-05-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2007.10.006
更新日期:2008-03-01 00:00:00
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journal_title:Journal of electrocardiology
pub_type: 杂志文章
doi:10.1016/j.jelectrocard.2018.06.015
更新日期:2018-01-01 00:00:00
abstract::Initial electrical forces emanating from interventricular septal depolarization, being directed to the right and anteriorly, normally produce an initial negative deflection or Q wave in leads I, aVL and V6 and an initial positive deflection or R wave in leads V1 and V2. The observations of hypertrophied interventricul...
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pub_type: 杂志文章
doi:10.1016/s0022-0736(81)80044-1
更新日期:1981-01-01 00:00:00