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- W1975348548 abstract "Right ventricular pacing alters left ventricular synchrony and loading conditions, each of which may independently influence left ventricular relaxation. Addition of a properly timed atrial contraction by using sequential atrioventricular (AV) pacing minimizes changes in left ventricular loading conditions, but ventricular asynchrony persists. To separate the effects of altered loading from those of asynchrony, the effects of right ventricular pacing and sequential AV pacing on the rate of isovolumic pressure decline (relaxation time constant), myocardial (segment) lengthening rate and chamber (minor axis dimension) filling rate were examined. In 12 open chest anesthetized dogs, left ventricular pressure (micromanometer) and either left ventricular free wall segment length transients (n = 6) or minor axis dimension transients (n = 6) were measured during right atrial, right ventricular and sequential AV pacing; length and dimension were measured using ultrasonic crystals. Compared with right atrial pacing, right ventricular pacing produced a decrease in systolic pressure, a reduction in fractional shortening, a prolongation of the relaxation time constant (23.5 +/- 0.7 to 29.8 +/- 0.8 ms, p less than 0.05), slower peak segment lengthening rate (6.2 +/- 0.6 to 4.6 +/- 0.8 s-1, p less than 0.05) and a slower rate of increase in chamber dimension (3.5 +/- 0.1 to 2.7 +/- 0.1 s-1, p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1975348548 date "1987-09-01" @default.
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- W1975348548 title "Right ventricular pacing reduces the rate of left ventricular relaxation and filling" @default.
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- W1975348548 doi "https://doi.org/10.1016/s0735-1097(87)80215-2" @default.
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