Optimum AV Interval in Dual Chamber Pacemakers

Approximately 50–70% of permanent implanted pacemakers are dual chamber pacemakers. However, little is known concerning adjustment of the atrioventricular (AV) interval to maximize cardiac output. Ten consecutive patients with complete heart block and dual chamber pacemakers were paced at heart rate...

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Bibliographic Details
Published in:Pacing and clinical electrophysiology 1986-09, Vol.9 (5), p.670-675
Main Authors: HASKELL, RICHARD J., FRENCH, WILLIAM J.
Format: Article
Language:English
Subjects:
AV interval
Cardiac Output
Cardiac Pacing, Artificial
Female
Heart - physiopathology
Heart Block - therapy
Heart Rate
Humans
Male
Middle Aged
pacemakers
Time Factors
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Summary:Approximately 50–70% of permanent implanted pacemakers are dual chamber pacemakers. However, little is known concerning adjustment of the atrioventricular (AV) interval to maximize cardiac output. Ten consecutive patients with complete heart block and dual chamber pacemakers were paced at heart rates of 80, 100, and 118 beats/ minute and at five AV intervals with simultaneous measurments of cardiac output using pulsed Doppler. Maximum cardiac output occurred at AV intervals of 150 and 200 ms at rates of 80 and 100 beats/minute, and at 150 ms at a rate of 118 beats/minute (p < .05). An increase in the AV interval to 250 ms resulted in a decrease in cardiac output at all heart rates (p < .01). We recommend the noninvasive measurement of cardiac output, if available, for determining the optimum AV interval in an individual patient; otherwise, an AV interval of 150 or 200 ms will provide the highest cardiac output in most patients.
ISSN:0147-8389
1540-8159
DOI:10.1111/j.1540-8159.1986.tb05414.x