title: Evaluation of the contractile state of the human heart from the first derivative of the apexcardiogram.
mesh_terms: D001021:Aortic Valve; D001794:Blood Pressure; D001993:Bronchodilator Agents / Q000494:pharmacology; D003327:Coronary Disease / Q000503:physiopathology; D004374:Ductus Arteriosus, Patent / Q000503:physiopathology; D004562:Electrocardiography; D006321:Heart / Q000502:physiology / Q000503:physiopathology*; D006343:Heart Septal Defects / Q000503:physiopathology; D006352:Heart Ventricles; D006801:Humans; D009921:Metaproterenol / Q000494:pharmacology; D008943:Mitral Valve; D009119:Muscle Contraction / Q000187:drug effects
chemical_list: D001993:Bronchodilator Agents; D009921:Metaproterenol