Key result
Vasopressin exerts dose-dependent positive chronotropic and negative inotropic effects in isolated canine atria.
Why the study?
The direct effects of vasopressin on SA nodal pacemaker activity and atrial contractility were unclear due to confounding reflex mechanisms in intact animals.
Suggests direct cardiac actions of vasopressin; leaves open translation to human physiology and practice.
Effects of vasopressin on SA nodal pacemaker activity and atrial contractility were investigated, using 5 isolated, blood-perfused canine atrium preparations. Vasopressin produced a dose-related positive chronotropic and negative inotropic effect, which was not influenced by treatments with an adequate dose of atropine or an adrenergic beta-blocking agent, alprenolol. From these results, it is concluded that vasopressin has a direct stimulating property on SA nodal pacemaker activity and a direct suppressive property on atrial contractility.
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Shigetoshi Chiba (1977) studied Healthy animal models (n=5). Vasopressin vs. Baseline was evaluated on Sinoatrial nodal pacemaker activity and atrial contractility. Vasopressin produced a direct, dose-related positive chronotropic and negative inotropic effect in isolated, blood-perfused canine atria.
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