Trendelenburg position and oxygen transport in hypovolemic adults.
OBJECTIVE
To evaluate the effect of the Trendelenburg position on oxygen transport in hypovolemic patients.


METHODS
A prospective, self-controlled sequential design.


METHODS
All patients had indwelling pulmonary artery catheters, and hypovolemia was confirmed by a pulmonary artery wedge pressure of 6 mm Hg or less. Hemodynamic and oxygen transport variables were measured with the patient supine and again ten minutes after placing the patient in the Trendelenburg position.


METHODS
University-affiliated tertiary care surgical ICU.


METHODS
Eight postoperative adults.


RESULTS
Mean arterial blood pressure increased from 64.9 +/- 4.9 to 75.6 +/- 3.5 mm Hg (P < .05), pulmonary artery wedge pressure increased from 4.6 +/- 1.1 to 7.9 +/- 0.8 mm Hg (P < .05), and the systemic vascular resistance rose to 2,965 +/- 210 from 2,302 +/- 199 dyne.sec/cm5 (P < .05). There was no significant change in cardiac index, oxygen delivery, oxygen consumption, or oxygen extraction ratio.


CONCLUSIONS
The increase in blood pressure from Trendelenburg position is not associated with an improvement in blood flow or tissue oxygenation.
Sing
R F
RF
Department of Surgery, Graduate Hospital, Philadelphia.
O'Hara
D
D
Sawyer
M A
MA
Marino
P L
PL
D000328:Adult; D000368:Aged; D006439:Hemodynamics; D006801:Humans; D008875:Middle Aged; D010100:Oxygen / Q000378:metabolism*; D011184:Postoperative Period; D011187:Posture / Q000502:physiology*; D011446:Prospective Studies; D012769:Shock / Q000378:metabolism* / Q000503:physiopathology / Q000628:therapy
D010100:Oxygen