title: An analysis of pulsus alternans in aortic stenosis.
abstract: Pulsus alternans was studied hemodynamically in 5 patients with calcific aortic stenosis. Left ventricular function was assessed by angiographic volume analysis and by force-velocity analysis. All cases showed alternation of max and min dP/dt and kVmax. Inconsistent factors were an alternating left ventricular enddiastolic pressure, alternating left ventricular enddiastolic volume, alternating left ventricular endsystolic volume, ejection fraction, enddiastolic wall stress and wall stiffness. All cases had a high ventricular mass, but the critical value of ventricular mass or the ratio of mass to left ventricular enddiastolic volume were also inconsistent. Pulses alternans is primarily due to alternating contractility.
mesh_terms: D000790:Angiocardiography; D001024:Aortic Valve Stenosis / Q000503:physiopathology*; D001794:Blood Pressure; D002302:Cardiac Output; D002306:Cardiac Volume; D004562:Electrocardiography; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006439:Hemodynamics; D006801:Humans; D008365:Manometry; D008875:Middle Aged; D009200:Myocardial Contraction; D011674:Pulse