Effect of dihydro-ouabain on vascular tone on the perfused cannine hindlimb

Digitalis compounds are known to cause contraction of vascular smooth muscle. However, it has been reported by Kahn and colleagues (J. Pharmacol. Exp. Ther. 142: 215-222, 1963) that dihydro-ouabain has no effect on vascular tone in dogs. The purpose of our study was to reassess the vasoconstrictor activity of dihydro-ouabain. This was done by monitoring perfusion pressure of the canine hindlimb preparation perfused at a constant rate of blood flow and administering intra-arterial injections of dihydro-ouabain. Increasing doses of this drug (i.e., 25, 50, 100, 200 and 300 mug) produced significant dose-dependent increases in perfusion pressure. Pretreatment with phentolamine prevented the effect of dihydro-ouabain on perfusion pressure. These results indicate that dihydro-ouabain causes contraction of vascular smooth muscle by an adrenergic mechanism.