Hemodynamic effect of the prone position during anesthesia

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Abstract
We studied 21 patients undergoing lumbar spinal surgery under halothane anesthesia on a convex saddle frame, in order to determine the hemodynamic effect of the prone position. A thermodilution pulmonary arterial catheter was placed in 14 patients (Group PA‐1: n = 8; and Group PA‐2: n = 6), and an inferior vena caval catheter in the remaining seven patients (Group IVC). Group PA‐1 and Group IVC patients were placed in the prone position on a convex saddle frame. In the prone position, the cardiac index (CI) decreased significantly from 3.1 ± 0.5 to 2.5 ± 0.3 (1·min‐1·m‐2 mean ± s.d., PP<0.05). We conclude that the prone position itself may not interfere with the circulatory function. The prone position using a convex saddle frame causes significant reductions in CI, but little change in the other hemodynamic variables.

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