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Theophylline이 心筋收縮力 亢進作用에 미치는 影響
李相卓,徐大圭 한양대학교 의과대학 1986 한양의대 학술지 Vol.6 No.1
Isolated rabbit left atria were driven electrically at frequency from 6 to 240/min stepwisely. The contractile force of electrically-driven left atria varied with frequency of stimulation: the developed tension increased with frequency between 6 and 120/min but decreased with increasing frequency higher than 180/min. The application of phenylephrine at concentrations of 10(???)M and 10(???)M increased the developed contractile tension and shifted the tension-frequency curve upward dose-dependently. The positive inotropic effect of phenylephrine was markedly inhibited by pretreatment with phentolamine (10(???)M) but no significant changes were observed with theophylline (10(???)⁴M)-treatment. Isoproterenol at concentrations of 2×10(???)M and 10(???)M also increased developed contractile tension and shifted the tension-frequency curve upward dose-relatedly. Pretreatment of atria with theophylline (10(???)⁴M) markedly potentiated the effect of isoproterenol.