The antihypertensive effects of verapamil and propranolol were evaluated in 62 patients with mild to moderate systemic hypertension. We also studied the change of 24 hours urinary catecholamines. 31 cases received verapamil and 31 others were treated by propranolol for 4 weeks. Before treating, there were no statistically significant differences (ECG, echocardiology, blood pressure...) noted between the two groups. Conclusions: 1) Blood pressure and heart rate were controlled by verapamil as well as by propranolol. 2) 24 hours urinary catecholamines were reduced by verapamil but not by propranolol
Hypertension ; Verapamil

The Na+ -K+ -activated ATPase is required to maintain osmotic balance and stabilize cell volume. The Na+ -K+ -ATPase has a more direct role in regulating cell volume; it controls the solute concentrations inside the cell, thereby regulating the osmotic forces that can make a cell swell or shrink. The impotance of the Na+ -K+ -ATPase in controlling cell volume is indicated by the observation that animal cells swell, and may burst, if they are treated with ouabain, which, inhibits the Na+ -K+ -ATPase. The present experiment was designed and carried out to determine the effect of verapamil, a calcium blocker, on the activity of Na+ -K+ -ATPase prepared from renal medulla in the normal rabbit. It was reported that verapamil, a well known coronary vasodilator, possessed negative inotropic effects. The mechanism of action of verapamil was initially thought to be due to coronary vasodilation and blockade of myocardial B-adrenergic receptors. 1t was termed such agent calcium antagonist. A derivative of verapamil, D-600, was subsequently shown to block the movement of calcium through the slow channel and thereby after the plateau phase of the cardiac action potential. Verapamil do not directly antagonize the effects of calcium. Rather, it inhibit the entry of ealcium into cells or its mobilization form intracellular stores and, as such, have been termed a calcium channel blocker.
Action Potentials ; Adenosine Triphosphatases* ; Adenosine* ; Animals ; Calcium ; Calcium Channels ; Cell Size ; Gallopamil ; Ouabain ; Vasodilation ; Verapamil*

No abstract available.
Coronary Vasospasm* ; Heart Arrest* ; Verapamil*

No abstract available.
Animals ; Macrophages, Alveolar* ; Rats* ; Superoxides* ; Verapamil*

No abstract available.
Allopurinol* ; Animals ; Liver* ; Rats* ; Reperfusion Injury* ; Verapamil*

Verapamil is highly effective in terminating paroxysmal supraventricular tachycardia(PSVT) by its depressive action on the AV node. In other countries it is already the drug of choice if vagal manevers fail for conversion of PSVT. We evaluated therapeutic efficacy of intravenous verapamil in 30 patients with PSVT who visited Severance Hospital from november 1978 to November 1984. Twenty six of 30 patients(86.7%) had a restoration of normal sinus rhythm by intravenous verapamil without significant side effects. Thus intravenous verapamil is safe and extremely effective in terminating most PSVT.
Atrioventricular Node ; Humans ; Tachycardia, Supraventricular* ; Verapamil*

No abstract available.
Injections, Intralesional* ; Male ; Penile Induration* ; Triamcinolone Acetonide* ; Triamcinolone* ; Verapamil*

This study was designed to investigate the effect of substitution of strontium for calcium on mechanical activity in isolated perfused spontaneously beating rat hearts. The mechanical activity of the hearts of Langendorff's preparation in conditions of low calcium and strontium-substitution for calcium was compared. The effect of norepinephrine and verapamil were also observed in those conditions. The results were as follows: 1. In low calcium, the mechanical activity of the heart preparation was significantly reduced, but when the equimolar strontium was substituted for the reduced calcium, the activity was kept at similar level to the normal condition. 2. When equimolar strontium was substituted for the total calcium in perfusate, the heart preparation stopped its beating, and it was not restored in spite of reperfusion with normal calcium perfusate. 3. Norepinephrine-induced positive inotropic effect was inhibited in low-calcium condition especially with low concentration of norepinephrine, but not in strontium-substitution for calcium. 4. Verapamil reduced the activity of the heart both in low-calcium and strontium-substitution as well as in normal calcium conditions. From above results, it was concluded that strontium served as a substitute of calcium in maintaining mechanical activity and in responsiveness to norepinephrine, and the influx of strontium through cell membrane is inhibited by verapamil as the influx of calcium.
Animals ; Calcium ; Cell Membrane ; Heart* ; Norepinephrine* ; Rats* ; Reperfusion ; Strontium* ; Verapamil

No abstract available.
Cyclosporine* ; Drug Resistance, Multiple* ; Humans* ; Lung Neoplasms* ; Lung* ; Tamoxifen* ; Verapamil*

Higenamine is known to possess stimulatory activity on beta-receptor of the heart. Chronotropic actions of higenamic were studied in spontaneously beating right atrial muscle isolated from rabbits. The frequency of spontaneous beating and the relative threshold voltage of the right atrium were examined. The relative threshold voltage was defined as the minimal voltage of the given impulse above which the right atrium could be paced at the frequency of 20% of higenamine was also observed. Higenamine caused the postive chronotropic effect. This response became prominent as the ca2+ concentration in the bathing solution lowered. When tetrodotoxin was added to the bathing solution, the effect of higenemine altered and became similar to that of epinephrine. Higenamine reduced the relative threshold voltage of the right atrium in the bathing solution with [ca2+] of 0.5mM. Such effect was abolished by tetrodotoxin. The effects of verapamill on the spontaneous rate and the relativel threshold voltage were inhibited by higenemine. The above results suggest that, aithough the main action og higenamine is on the Ca channel, higenamine also have a minor effect of augmenting the Na channel.
Baths ; Epinephrine ; Heart ; Heart Atria* ; Heart Rate ; Rabbits ; Tetrodotoxin ; Verapamil