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• W2164012016 abstract "Patients with borderline hypertension have exaggerated vascular responses to orthostatic stress produced by tilt or lower body negative pressure (LBNP). It has been suggested that 1) in the supine position, these patients have augmented activity of cardiopulmonary baroreceptors that exerts an increased restraint on sympathetic vasoconstrictor tone; 2) withdrawal of this augmented inhibitory baroreceptor activity during orthostatic stress elicits augmented reflex sympathetic vasoconstrictor outflow; and 3) augmented cardiopulmonary baroreceptor activity may be secondary to impaired arterial baroreflex mechanisms. To test these hypotheses, we recorded muscle sympathetic nerve activity from the peroneal nerve in seven borderline hypertensive subjects and seven age-, sex-, and weight-matched normotensive subjects during three levels of nonhypotensive LBNP and infusions of phenylephrine and nitroprusside. During LBNP, reductions of central venous pressure were similar in borderline hypertensive and normotensive subjects, and arterial pressure and heart rate values were unchanged. Increases of sympathetic nerve activity, however, were significantly greater in borderline hypertensive than in normotensive subjects at each level of LBNP, indicating an augmented gain of the cardiopulmonary baroreflex. To determine whether this augmentation is related to impairment of arterial baroreflexes, we measured changes of sympathetic nerve activity during increases and decreases of arterial pressure produced with infusions of intravenous phenylephrine and nitroprusside. Central venous pressure was held at control levels by LBNP during phenylephrine and saline infusion during nitroprusside. Changes of sympathetic nerve activity during alterations of arterial pressure were similar in borderline hypertensive and normotensive subjects. These data show that cardiopulmonary baroreflex control of SNA is augmented in borderline hypertensive subjects and that this augmentation does not result from an attenuation of the arterial baroreflex." @default.
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• W2164012016 title "Baroreflex control of muscle sympathetic nerve activity in borderline hypertension." @default.
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• W2164012016 doi "https://doi.org/10.1161/01.cir.82.3.856" @default.
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