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disopyramideは1954年に合成され,その燐酸塩であるdisopyramide phosphate (DP)は現在広く臨床に用いられている1,2)。本剤は直接作用に加えて比較的強い抗コリン作用を有するために,洞不全症候群(SSS)に対する影響は諸家の報告において一致した結果が得られていない。また,血行動態におよぼす影響も必ずしも明らかにはされていない。本稿の目的はSSSを中心として,DP投与前後における電気生理学的検討ならびに血行動態に対する影響を検討することである。
The electrophysiological and hemodynamic effects of Disopyramide phosphate (DP) were studied in 16 patients (10 sick sinus syndrome, 6 supraventricular and ventricular tachycardia) and in 3 control cases.1~2mg/kg DP was administered intravenously as a bolus. Heart rate was insigni-ficantly increased. However, A-H interval was lengthened in 3 (30%) and shortened in 5 of 15 patients (33%).
Lengthening of H-V interval was found in 5 of 16 patients (31%) but shortening was not recorded. It was thought that these changes were induced by dual effects, such as direct membraneous de-pressive and anticholinergic effects of disopyra-mide.
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