title: Effect of beta-adrenergic blockade on beat-to-beat response to Valsalva manoeuvre.
mesh_terms: D000328:Adult; D000526:Alprenolol / Q000494:pharmacology*; D002302:Cardiac Output / Q000187:drug effects*; D002986:Clinical Trials as Topic; D004562:Electrocardiography; D006339:Heart Rate / Q000187:drug effects*; D006352:Heart Ventricles / Q000187:drug effects; D006801:Humans; D008297:Male; D010919:Placebos; D012018:Reflex; D013997:Time Factors; D014636:Valsalva Maneuver
chemical_list: D010919:Placebos; D000526:Alprenolol