title: Evaluation of century-old physical signs, S3 and S4, by modern technology.
authors.forename: S
authors.initials: S
authors.lastname: Zoneraich
mesh_terms: D000818:Animals; D004285:Dogs; D006347:Heart Sounds / Q000502:physiology*; D009200:Myocardial Contraction / Q000502:physiology; D010701:Phonocardiography; D016276:Ventricular Function / Q000502:physiology