Open AccessEchocardiography for Determining the Optimal Atrioventricular Interval in Patients with Dual Chamber Pacemakers
Author(s) -
Sun Pin,
Zhao Qing,
Wang ZhiBin,
Li JianSheng,
Wo JinShan,
Cai ShangLang
Publication year - 2009
Publication title -
clinical cardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.263
H-Index - 72
eISSN - 1932-8737
pISSN - 0160-9289
DOI - 10.1002/clc.20555
Subject(s) - medicine , atrioventricular valve , cardiology , atrioventricular block , atrioventricular septal defect , doppler echocardiography , stroke volume , pr interval , mitral valve , heart block , interval (graph theory) , electrocardiography , heart disease , heart rate , heart failure , ejection fraction , ventricle , mathematics , combinatorics , blood pressure , diastole
Background We investigated the clinical value of Doppler echocardiography for determining the optimal setting of atrioventricular interval in patients with dual chamber pacemakers (DDD). In 38 patients with complete atrioventricular block and DDD pacemakers, the atrioventricular interval was prolonged in a stepwise fashion by 20 ms, from 90 to 250 ms, and cardiac stroke volume and transmitral flow were measured by pulsed Doppler echocardiography. Methods The optimal atrioventricular interval at which the cardiac stroke volume was maximal was 168.9 ± 15.6 ms. The atrioventricular interval was 178.4 ± 23.4 ms when the end of the A wave coincided with complete closure of the mitral valve. Results There was a significant linear relationship between the optimal atrioventricular interval and the predicted optimal atrioventricular interval ( Y = 86.2 ± 0.5 X , r = 0.70, standard error of the estimate [SEE] = 11.5, P < 0.01). Conclusion The optimal atrioventricular interval setting for DDD pacing can be successfully determined using Doppler echocardiography, which is a noninvasive, repeatable, and simple approach. Copyright © 2009 Wiley Periodicals, Inc.