<prompt> Patients with syncope cannot maintain sufficient cardiac output to meet peripheral perfusion demands. Which of the following BEST describes cardiac output?Cardiac output end diastolic volume - end systolic volumeCardiac output hea rate X mean aerial pressureCardiac output hea rate X stroke volumeCardiac output stroke volume X mean aerial pressure  <response>: Cardiac output hea rate X stroke volume: is the correct answer. 1st Choice is incorrect: Stroke volume end diastolic volume - end systolic volume 2nd Choice is incorrect: Double product estimation of cardiac work mean aerial pressure X hea rate 4th Choice is a nonsense distractor Ref: Mohrman D.E., Heller L.J. 2010. Chapter 3. The Hea Pump. In D.E. Mohrman, L.J. Heller Eds, Cardiovascular Physiology, 7e. 