PMID: 7083729Jul 1, 1982Paper

Antiarrhythmic effects of the quaternary propranolol analog that does not induce beta-adrenergic blockade

Clinical Pharmacology and Therapeutics
S B ReeleR L Woosley


Pranolium chloride (dimethylpropranolol chloride) is a nonbeta blocking quaternary ammonium that has structural similarities to propranolol and bretylium that exert antiarrhythmic effects in animals. In initial studies, eight patients with chronic ventricular arrhythmias were given gradually increasing intravenous doses of pranolium (up to 3 mg/kg) obtaining plasma concentrations up to 7 micrograms/ml without change in pulse, blood pressure, or arrhythmia frequency. We therefore evaluated the response to pranolium in seven similar patients at doses up to 10 mg/kg as an infusion of 100 microgram/kg/min over 40 to 100 min. At plasma concentrations of 4.7 to 12.2 micrograms/ml, there was suppressing of ventricular ectopic depolarization (greater than 90%) in three subjects and in two others there was partial suppression (49% and 82%). Arrhythmia frequency was unchanged in two. At plasma concentrations of 4.1 to 17.2 micrograms/ml four subjects developed nausea (two of these also vomited) and to experienced perioral numbness. There was no change in sinus heart rate, supine or standing blood pressure, venous reflex response (adrenergic reflex venoconstriction), or ECG intervals in any subject. Pranolium appeared to have antiarrhythm...Continue Reading


Related Concepts

Pranolium iodide, (+-)-isomer
Cardiac Depressants
Cardiac Arrhythmia
Dose-Response Relationship, Drug
Drug Evaluation

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