1. Lack of influence of atrioventricular delay on stroke volume at rest in patients with complete atrioventricular block and dual chamber pacing.
- Author
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Occhetta E, Piccinino C, Francalacci G, Magnani A, Bolognese L, Devecchi P, Rognoni G, and Rossi P
- Subjects
- Aged, Aged, 80 and over, Cardiac Output physiology, Echocardiography, Echocardiography, Doppler, Female, Heart Block therapy, Heart Rate physiology, Humans, Male, Middle Aged, Myocardial Contraction physiology, Pacemaker, Artificial, Time Factors, Atrioventricular Node physiopathology, Cardiac Pacing, Artificial methods, Heart Block physiopathology, Heart Conduction System physiopathology, Stroke Volume physiology
- Abstract
Dual chamber pacing (DDD) maintains atrioventricular (AV) sequence; AV delay programmability modifies the relationship between atrial and ventricular contraction. To evaluate the hemodynamic effects of such a modification, ten patients with a DDD unit for complete AV block were studied by time-motion (M-mode) and Doppler echocardiography during inhibited ventricular pacing (VVI), atrial-triggered ventricular pacing (VDD) and atrioventricular sequential pacing (DVI) at different AV delay (90, 140, 190, 240 msec). A significant improvement in stroke volume (SV) (15%-20%, P less than 0.05) was seen during DDD versus VVI pacing; no changes, however, were observed in the same patient with different AV delay or during DVI versus VDD pacing. These data suggest that programming of AV delay does not affect systolic performance at rest; longer diastolic filling times recorded during DDD pacing with "short" AV delay (90-140 msec) do not seem to be a hemodynamically relevant epi-phenomenon of PM programming.
- Published
- 1990
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