title: Interchangeability of left ventriculograms.
mesh_terms: D002302:Cardiac Output; D003327:Coronary Disease / Q000000981:diagnostic imaging*; D006321:Heart / Q000000981:diagnostic imaging*; D006334:Heart Function Tests; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D011859:Radiography; D012107:Research Design