What is the Optimum A-V Interval in D.D.D. Pacing?

Rao, Gopal; Winzelberg, Gary; Flaherty, Patrick
April 1985
Angiology;Apr1985, Vol. 36 Issue 4, p253
Academic Journal
One of the programmable parameters in recent pacemakers is atrio-ventricular interval. To find out the optimum A-V interval studies were done in 14 patients. Multigated radionuclide scans were used to measure the left ventricular function, at a resting heart rate of 70/minute. Seven patients had poor left ventricles (ejection fraction <50%). Left ventricular ejection fraction, relative cardiac output and end diastolic counts were highest at 250 M. Sec. interval compared to <50. Ejection rates and end systolic counts were not related to A-V interval. Relative cardiac output was 27% higher in poor ventricles at 250 delay than 150. This observation was not significant in normal hearts. Optimum P-R interval is 250 M. Sec. for maximum left ventricular function.


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