Release of atriopeptin in the rat by vasoconstrictors or water immersion correlates with changes in right atrial pressure

Add time:08/29/2019    Source:sciencedirect.com

Vasopressin, its 1-deamino analog (dAVP), angiotensin II, and phenylephrine, administered intravenously, increased plasma atriopeptin immunoreactivity in chloral hydrate-anesthetized rats. A continuous one hour infusion of either dAVP or phenylephrine caused a sustained elevation in: a) systemic blood pressure; b) right atrial pressure; c) left ventricular end diastolic pressure; and d) plasma atriopeptin immunoreactivity. While continuous infusion of angiotensin II also produced a sustained elevation in left ventricular end diastolic pressure, the changes in right atrial pressure and plasma atriopeptin were only transient. These data suggest that plasma atriopeptin most closely correlates with right atrial pressure. Consistent with this hypothesis, we found that the release of atriopeptin directly correlated with changes in right atrial pressure in anesthetized, water-immersed rats.

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