Vasoconstriction and hypersensitivity to vasoactive substances after acute volume expansion in dogs.
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چکیده
منابع مشابه
Vasoconstriction and hypersensitivity to vasoactive substances after acute volume expansion in dogs.
In a search for factors contributing to the sustained blood pressure (BP) elevation in acutely volume-loaded animals, dextran dissolved in lactated Ringer's solution (20 ml/kg) was infused into 34 mongrel dogs over a period of 1 hour under pentobarbital anesthesia and changes in hemodynamic and humoral variables were monitored during its infusion and for 3 hours after its infusion. BP elevation...
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Elucidation of the mechanism by which coronary flow is regulated has been attempted. Substances with coronary vasodilator or vasoconstrictor properties as well as those with inotropic or chronotropic effects on isolated frog hearts were sought in the coronary sinus blood of dogs. Blood draining normal, hypoxic or "overperfused" hearts was oxygenated in a dog lung or on a screen and perfused at ...
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We determined whether a 3-minute period of intense cardiac sympathetic stimulation, which is known to release neuropeptide Y (NPY), elicits a sustained poststimulatory coronary vasoconstriction in anesthetized dogs that had received propranolol. We also periodically measured the cardiac chronotropic responses to test vagal stimulations; these responses served as an index of the neuronal release...
متن کاملEffects of acute blood volume expansion on vascular resistance and reactivity in anaesthetized dogs.
1. The effects of acute volume expansion on vascular resistance and reactivity to noradrenaline and angiotensin I1 are reported in this study. The estimated circulating blood volume of pentobartibal-anaesthetized dogs was expanded by about 35% with equilibrated donor blood. The animals were bilaterally nephrectomized to sustain expanded volume. 2. Functional changes in vascular smooth muscle we...
متن کاملVolume expansion during acute angiotensin II receptor (AT(1)) blockade and NOS inhibition in conscious dogs.
The responses to AT(1)-receptor blockade (candesartan 1 mg/kg) and to concomitant volume expansion (saline 35 ml/kg for 90 min) with and without nitric oxide synthase (NOS) inhibition (N(G)-nitro-L-arginine methyl ester 30 microg small middle dot kg(-1) small middle dot min(-1)) were investigated in separate experiments in normal dogs. AT(1) blockade decreased arterial pressure (106 +/- 4 to 96...
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ژورنال
عنوان ژورنال: Hypertension
سال: 1988
ISSN: 0194-911X,1524-4563
DOI: 10.1161/01.hyp.12.1.59