Second-degree atrioventricular block

D. P. Zipes

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

1) While it is possible only one type of second-degree AV block exists electrophysiologically, the available data do not justify such a conclusion and it would seem more appropriate to remain a 'splitter', and advocate separation and definition of multiple mechanisms, than to be a 'lumper', and embrace a unitary concept. 2) The clinical classification of type I and type II AV block, based on present scalar electrocardiographic criteria, for the most part accurately differentiates clinically important categories of patients. Such a classification is descriptive, but serves a useful function and should be preserved, taking into account the caveats mentioned above. The site of block generally determines the clinical course for the patient. For most examples of AV block, the type I and type II classification in present use is based on the site of block. Because block in the His-Purkinje system is preceded by small or nonmeasurable increments, it is called type II AV block; but the very fact it is preceded by small increments is because it occurs in the His-Purkinje system. Similar logic can be applied to type I AV block in the AV node. Exceptions do occur. If the site of AV block cannot be distinguished with certainty from the scalar ECG, an electrophysiologic study will generally reveal the answer.

Original languageEnglish (US)
Pages (from-to)465-472
Number of pages8
JournalCirculation
Volume60
Issue number3
StatePublished - 1979

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Atrioventricular Block
Atrioventricular Node
Electrocardiography

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Zipes, D. P. (1979). Second-degree atrioventricular block. Circulation, 60(3), 465-472.

Second-degree atrioventricular block. / Zipes, D. P.

In: Circulation, Vol. 60, No. 3, 1979, p. 465-472.

Research output: Contribution to journalArticle

Zipes, DP 1979, 'Second-degree atrioventricular block', Circulation, vol. 60, no. 3, pp. 465-472.
Zipes DP. Second-degree atrioventricular block. Circulation. 1979;60(3):465-472.
Zipes, D. P. / Second-degree atrioventricular block. In: Circulation. 1979 ; Vol. 60, No. 3. pp. 465-472.
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