Failure of atriopeptin II to cause arterial vasodilation in the conscious rat.

Abstract:

:The cardiovascular actions of the synthetic natriuretic peptide, atriopeptin II, were examined in conscious unrestrained spontaneously hypertensive rats and normotensive Wistar-Kyoto rats. The animals were chronically instrumented with miniaturized pulsed Doppler flow probes to allow measurement of regional blood flow, or with an electromagnetic flow probe on the ascending aorta to facilitate the measurement of cardiac output in the conscious rat. Intravenous infusion of increasing doses of atriopeptin II (0.25-4 micrograms/kg per min) caused a dose-dependent fall in mean arterial pressure in the hypertensive and normotensive rats. Blood flow in the renal, mesenteric, and hindquarters vascular beds was markedly decreased during the infusion of atriopeptin II, and regional vascular resistance was significantly increased in both groups of rats. Heart rate was significantly elevated (47 +/- 14 beats/min) in the spontaneously hypertensive rats during atriopeptin II infusion, but no change in heart rate was observed in the Wistar rats. In the hypertensive rats, atriopeptin II caused a marked dose-dependent decrease in cardiac output (maximal decrease = -39 +/- 4%) and stroke volume (maximal decrease = -48 +/- 4%). Central venous pressure and left atrial pressure were also significantly reduced during atriopeptin II infusion. Total peripheral resistance was increased over the infusion protocol by 26 +/- 3%. These data suggest that atriopeptin II infusion markedly attenuated cardiac output in the conscious spontaneously hypertensive rats. Total and regional vascular resistances were increased, possibly through reflex compensatory mechanisms, to maintain arterial pressure in the face of decreased cardiac output.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Circ Res

journal_title

Circulation research

authors

Lappe RW,Smits JF,Todt JA,Debets JJ,Wendt RL

doi

10.1161/01.res.56.4.606

subject

Has Abstract

pub_date

1985-04-01 00:00:00

pages

606-12

issue

4

eissn

0009-7330

issn

1524-4571

journal_volume

56

pub_type

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