PMID: 3744598Aug 1, 1986Paper

Dissociation of the responses of the renin-angiotensin system and sympathetic nervous system to a vasodilator stimulus in congestive heart failure

International Journal of Cardiology
T B LevineJ N Cohn

Abstract

The ability of neurohumoral reflex control mechanisms to respond to a vasodilator mediated alteration in hemodynamic status was studied. A sodium nitroprusside infusion was administered to 5 normal subjects and 47 patients with severe congestive heart failure resulting in significant decreases in mean arterial pressure and in systemic vascular resistance. As expected in normals the vasodilator stimulus caused a reflex activation in both the renin-angiotensin system and sympathetic nervous system as measured by increased plasma renin activity and plasma norepinephrine, respectively. In the patients with heart failure, plasma renin activity rose similarly in response to nitroprusside (+63% in heart failure, 100% in normals, P = NS) while plasma norepinephrine remained essentially unchanged (+11% in heart failure, 98% in normals, P less than 0.01). These data demonstrate that the neurohumoral dysfunction seen in patients with heart failure is not uniform. In patients with severe congestive heart failure the renin-angiotensin system apparently is activated by mechanisms other than sympathetic nervous stimulation. This intact reflex humoral response may still function in opposition to the beneficial hemodynamic effects produced by d...Continue Reading

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Citations

Feb 1, 1996·The Journal of Small Animal Practice·J HäggströmC Kvart
Oct 18, 2005·European Journal of Heart Failure·Magnus PeterssonBengt Rundqvist
Dec 1, 1994·Journal of Autism and Developmental Disorders·P SzatmariD L Streiner
Sep 14, 2010·Clinical Physiology and Functional Imaging·Athanasios MandroukasKonstantinos Mandroukas

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