title: On the decrease of myocardial oxygen consumption induced by chloracyzine.
abstract: The effects of chloracyzine (2-chloro-10-(3-diethylaminopropionyl)-phenothiazine hydrochloride; antianginal drug) on myocardial oxygen consumption were studied in open-chest cats and cat isolated hearts using oximetry and polarography respectively. It was found that chloracyzine produced a decrease in myocardial oxygen consumption accompanied by a reduction in coronary blood flow preceded by transient coronary dilatation. Chloracyzine produced an insignificant increase in arterial pressure; heart rate increased slightly in the open-chest experiments but not in the isolated heart. It is suggested that reduced oxygen uptake after chloracyzine is realized through improved efficiency in the use of oxygen.
mesh_terms: D000628:Aminophylline / Q000494:pharmacology; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002415:Cats; D003326:Coronary Circulation / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D009206:Myocardium / Q000378:metabolism*; D010101:Oxygen Consumption / Q000187:drug effects*; D010640:Phenothiazines / Q000494:pharmacology*; D011299:Prenylamine / Q000494:pharmacology
chemical_list: D010640:Phenothiazines; D000628:Aminophylline; D011299:Prenylamine; C004584:chloracizine