Preload measures?: (A) End systolic volume, (B) End diastolic volume, (C) Peripheral resistance, (D) Stroke volume
Answer is B. ANSWER: (B) End diastolic volumeREF: Guytons physiology 22nd edition page 111, http://en.wikipedia.org/wiki/Preload_% 28cardiology%29"For cardiac contraction, the preload is usually considered to be the end-diastolic pressure when the ventricle has become filled"Quantitatively, preload can be calculated asLV EDT . LV EDR2hWhere LVEDP = Left ventricular end diastolic pressure, LVEDR = Left ventricular end diastolic radius (at the ventricle s midpoint), and h = thickness of the ventricle. This calculation is based on the Law of Laplace.