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- W1999853886 abstract "Background —Ventricular tachyarrhythmias present a unique set of stimuli to arterial and cardiopulmonary baroreceptors by increasing cardiac filling pressures and decreasing arterial pressure. The net effect on the control of sympathetic nerve activity (SNA) in humans is unknown. The purpose of this study was to determine the relative roles of cardiopulmonary and arterial baroreceptors in controlling SNA and arterial pressure during ventricular pacing in humans. Methods and Results —Two experiments were performed in which SNA and hemodynamic responses to ventricular pacing were compared with nitroprusside infusion (NTP) in 12 patients and studied with and without head-up tilt or phenylephrine to normalize the stimuli to either the arterial or cardiopulmonary baroreceptors in 9 patients. In experiment 1, the slope of the relation between SNA and mean arterial pressure was greater during NTP (−4.7±1.4 U/mm Hg) than during ventricular pacing (−3.4±1.1 U/mm Hg). Comparison of NTP doses and ventricular pacing rates that produced comparable hypotension showed that SNA increased more during NTP ( P =0.03). In experiment 2, normalization of arterial pressure during pacing resulted in SNA decreasing below baseline ( P <0.05), whereas normalization of cardiac filling pressure resulted in a greater increase in SNA than pacing alone (212±35% versus 189±37%, P =0.04). Conclusions —These data demonstrate that in humans arterial baroreflex control predominates in mediating sympathoexcitation during ventricular tachyarrhythmias and that cardiopulmonary baroreceptors contribute significant inhibitory modulation." @default.
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- W1999853886 date "1999-08-10" @default.
- W1999853886 modified "2023-09-23" @default.
- W1999853886 title "Reflex Control of Sympathetic Activity During Simulated Ventricular Tachycardia in Humans" @default.
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- W1999853886 doi "https://doi.org/10.1161/01.cir.100.6.628" @default.
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