Effect of verapamil on ventricular contraction.
D002118:Calcium / Q000378:metabolism; D006321:Heart / Q000187:drug effects*; D006352:Heart Ventricles / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D016276:Ventricular Function; D014700:Verapamil / Q000494:pharmacology*
D014700:Verapamil; D002118:Calcium