Keyword
stroke volume variation (SVV).
Definition
SVV = SV max − SV min
SV mean
Preload reserve를 나타내는 수치이며, 증가하는 경우 Fluid therapy가 필요.
Mechanism
SVV는 30초동안의 ventilation cycle중 측정된 maximum and minimum SV를 이용하여 위의 식을 이용하여 variation을 %로 나타낸 것
Normal range
조절호흡시 10~15% 이하가 정상이다
Further readings
The Use of Stroke Volume Variation and Arterial Pressure Based Cardiac Output to Guide Intra-operative Volume Resuscitation in Cardiovascular Surgery
( http://www.scahq.org/sca3/newsletters/2007aug/di_update.pdf)
Reference
Miller’s Anesthesia, 8th edition, CH 45. p1584
Morgan and Mikhail's Clinical Anesthesiology, 5th edition, CH51. P.1163