open access

Vol 14, No 4 (2007)
Original articles
Published online: 2007-06-11
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Sinoatrial Wenckebach periodicity as an independent marker for the development of high-degree sinoatrial exit block

Andrzej Dąbrowski, Ryszard Piotrowicz, Elżbieta Kramarz, Leszek Kubik
Cardiol J 2007;14(4):391-395.

open access

Vol 14, No 4 (2007)
Original articles
Published online: 2007-06-11

Abstract


Background: The present study of patients with Wenckebach-type second-degree sinoatrial block (W-block) evaluated the probability of the development of a more advanced grade of sinoatrial block. Data on the clinical significance of W-block are limited. It is unknown whether W-block predicts a more advanced grade of sinoatrial block.
Methods: Standard ECGs of 412 patients with symptoms that might have been related to cardiac arrhythmias were reviewed for the presence of W-block. In the initial ECG W-block occurred in 29. During the follow-up period of 62 ± 35 months the main end-point was the first episode of type II second-degree sinoatrial block. An additional end-point was the occurrence of a sinus pause greater than 3 s or the development of type II second-degree sinoatrial block.
Results: Of the 29 patients with W-block initially, 6 (20.7%) developed higher grade sinoatrial block, and sinoatrial arrhythmic events occurred in 9 (31%). In the 383 patients without W-block subsequent episodes of higher grade sinoatrial block occurred in 14 (3.7%) and sinoatrial arrhythmic events in 28 (7.3%). A multivariate Cox analysis identified W-block as an independent marker for developing type II second-degree sinoatrial block (HR = 3.72, 95% CI 1.39-9.99) and for the occurrence of sinoatrial arrhythmic events (HR 3.01, 95% CI 1.37-6.58).
Conclusions: In patients with symptoms that might be caused by cardiac arrhythmias the presence of W-block in a standard ECG indicates a high probability of developing a more advanced grade of sinoatrial block. (Cardiol J 2007; 14: 391-395)

Abstract


Background: The present study of patients with Wenckebach-type second-degree sinoatrial block (W-block) evaluated the probability of the development of a more advanced grade of sinoatrial block. Data on the clinical significance of W-block are limited. It is unknown whether W-block predicts a more advanced grade of sinoatrial block.
Methods: Standard ECGs of 412 patients with symptoms that might have been related to cardiac arrhythmias were reviewed for the presence of W-block. In the initial ECG W-block occurred in 29. During the follow-up period of 62 ± 35 months the main end-point was the first episode of type II second-degree sinoatrial block. An additional end-point was the occurrence of a sinus pause greater than 3 s or the development of type II second-degree sinoatrial block.
Results: Of the 29 patients with W-block initially, 6 (20.7%) developed higher grade sinoatrial block, and sinoatrial arrhythmic events occurred in 9 (31%). In the 383 patients without W-block subsequent episodes of higher grade sinoatrial block occurred in 14 (3.7%) and sinoatrial arrhythmic events in 28 (7.3%). A multivariate Cox analysis identified W-block as an independent marker for developing type II second-degree sinoatrial block (HR = 3.72, 95% CI 1.39-9.99) and for the occurrence of sinoatrial arrhythmic events (HR 3.01, 95% CI 1.37-6.58).
Conclusions: In patients with symptoms that might be caused by cardiac arrhythmias the presence of W-block in a standard ECG indicates a high probability of developing a more advanced grade of sinoatrial block. (Cardiol J 2007; 14: 391-395)
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Keywords

sinoatrial node; arrhythmia; electrocardiography; prognosis

About this article
Title

Sinoatrial Wenckebach periodicity as an independent marker for the development of high-degree sinoatrial exit block

Journal

Cardiology Journal

Issue

Vol 14, No 4 (2007)

Pages

391-395

Published online

2007-06-11

Bibliographic record

Cardiol J 2007;14(4):391-395.

Keywords

sinoatrial node
arrhythmia
electrocardiography
prognosis

Authors

Andrzej Dąbrowski
Ryszard Piotrowicz
Elżbieta Kramarz
Leszek Kubik

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