Precision and consistency of passive leg raise in determining fluid responsiveness.

Precision is described by the range, average deviation, and standard deviation of the change in stroke volume index (ΔSVI) over 3 cycles of passive leg raising (PLR) maneuver. Consistency was defined as the same fluid responsiveness determination of “Yes” (ΔSVI > 10%) or “No” (ΔSVI ≤ 10%) over the 3 cycles of PLR maneuver. For example, a subject was categorized to have consistent results if they were persistently fluid responsive or not fluid responsive for all 3 cycles of PLR maneuver. A subject had inconsistent results if any one of the 3 cycles of PLR maneuver resulted in a fluid responsiveness determination that was different from the other PLR’s. Data are represented as mean ± standard deviation or as count (percentage).