The influence of vagal activity on heart block; a study of the effect of oxygen, mecholyl, and atropine on auriculoventricular conduction time.
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D001285:Atropine; D006321:Heart; D006327:Heart Block; D006339:Heart Rate; D006801:Humans; D016210:Methacholine Chloride; D010100:Oxygen
D016210:Methacholine Chloride; D001285:Atropine; D010100:Oxygen