Dynamic parameters for intraoperative fluid therapy

	Advantage	Disadvantage
Systolic pressure variations	Easy to manually calculate	Depends on diastolic pressure and on changes in pleural pressure (Has not been studied in the prone position)
Pulse pressure variations	Directly related to stroke volume variations	Not easy to manually calculate
Pulse pressure variations	Directly related to stroke volume variations	Need specific device for continuous display
Stroke volume variations	Accurate analysis despite multiple extrasystoles	Need specific device

Modified with permission from: Biais M, Ouattara A, Janvier G, Sztark F. Case scenario: Respiratory variations in arterial pressure for guiding fluid management in mechanically ventilated patients. Anesthesiology 2012; 116:1354. Copyright © 2012 Lippincott Williams & Wilkins.

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Dynamic parameters for intraoperative fluid therapy