title: Effects of alpha- and beta-receptor blockade on systolic time intervals.
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D003864:Depression, Chemical; D004562:Electrocardiography; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D006352:Heart Ventricles / Q000187:drug effects; D006801:Humans; D008297:Male; D010096:Oxprenolol / Q000494:pharmacology; D010646:Phentolamine / Q000494:pharmacology; D010919:Placebos; D013997:Time Factors
chemical_list: D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists; D010919:Placebos; D010096:Oxprenolol; D010646:Phentolamine