Effects of vasomotor drugs on heart sound amplitude measured by the contour sound spectogram.
D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D004285:Dogs; D006801:Humans; D009638:Norepinephrine / Q000494:pharmacology*; D010701:Phonocardiography
D000109:Acetylcholine; D009638:Norepinephrine