Vasodilator Action of Guanethidine

Vasodilator action of guanethidine.

Enhancement of coronary vasodilator action of adenosine triphosphate by dipyridamole.

It has been reported that previously administered dipyridamole intensifies the coronary vasodilator action of adenosine compounds. In the present study, a combination of dipyridamole and ATP at doses that alone are ineffective was examined for its effect on the coronary sinus blood flow. In 10 anesthetized dogs, heart rate, arterial blood pressure, cardiac output, and coronary sinus blood flow ...

Mechanisms of action of OPC-28326, a selective hindlimb vasodilator.

The unique cardiovascular profile of OPC-28326 [4-(N-methyl-2-phenylethylamino)-1-(3, 5-dimethyl-4-propionylaminobenzoyl)piperidine hydrochloride monohydrate] provides insight into basic mechanisms of this new drug as determined by experiments in dogs and rats. In anesthetized open-chest dogs, an i.v. administration of a low dose (0.3 and 1.0 microg/kg) of OPC-28326 selectively increased femora...

Patient Acceptance of Guanethidine

The relative benefits and risks of reserpine and guanethidine were compared in patients with thiazide-treated mild to moderate hypertension (diastolic pressure 95-115 mm Hg). Fortynine ambulant patients (30 men, 19 women) were treated throughout the study with hydrochlorothiazide, 50 mg/day. In this double blind crossover study each drug was added in graded increments until a predetermined ther...

Vasodilator action of calcium antagonists in coronary arteries in vitro.

Calcium antagonists have routinely been assumed to inhibit the contractions of arterial smooth muscle through block of membrane channels. The effects of nifedipine and diltiazem on contractions were examined in in vitro preparations of cattle coronary artery, one of the key therapeutic targets of calcium antagonists, to determine if alternate mechanisms of action are involved. Contractions elic...