Key result
Varying ventricular pacing rates from 50 to 100 beats/min revealed that patients with cardiomegaly have a narrow range of optimal pacing rates (70-90 beats/min) to maximize cardiac index.
Why the study?
Does varying the ventricular pacing rate affect left ventricular volumes and ejection fraction in patients with permanent pacemakers?
Population
22 patients with permanent ventricular pacemakers
Comparison
Ventricular pacing at varying rates vs Different pacing rates within the same patients…
Design
Cohort
Follow-up
4.3 months
Authors
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Suggests individualized rate selection in cardiomegaly; leaves open randomized confirmation for pacemaker programming.
Observational (n=22)
Does varying the ventricular pacing rate affect left ventricular volumes and ejection fraction in patients with permanent pacemakers?
Patients with cardiomegaly and permanent pacemakers have a narrow range of optimal pacing rates (70-90 beats/min) to maximize cardiac index at rest.
Narahara et al. (1983) conducted an observational in Permanent ventricular pacemakers (n=22). Ventricular pacing rates of 50-100 beats/min vs. Different pacing rates and sinus rhythm was evaluated on Left ventricular ejection fraction and volume indexes. Varying ventricular pacing rates from 50 to 100 beats/min revealed that patients with cardiomegaly have a narrow range of optimal pacing rates (70-90 beats/min) to maximize cardiac index.
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