title: Evaluation of cardiac efficiency (a preliminary note on a new method).
mesh_terms: D000293:Adolescent; D000328:Adult; D002302:Cardiac Output; D002648:Child; D005260:Female; D006333:Heart Failure / Q000503:physiopathology; D006334:Heart Function Tests / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011187:Posture; D011674:Pulse