title: Measurement of systolic time intervals.
mesh_terms: D000328:Adult; D004077:Digoxin / Q000494:pharmacology; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D008297:Male; D010042:Ouabain / Q000494:pharmacology; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D010042:Ouabain; D004077:Digoxin