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The effect of Ca-antagonist on the contractile apparatus was investigated in glycerinated cardiac papillary muscle preparations obtained from canine hearts. The results showed that maximal developed tension (P0) was enhanced significantly by 5 mg/liter of verapamil, and the augmentation of contractility was dependent on the concentrations of verapamil. As a conclusion, Ca-antagonist appeared to be a potentiating agent of the contractile force on the contractile apparatus.
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