Use of pulse oximetry as a noninvasive indicator of intravascular volume status.
The use of pulse oximetry as a noninvasive method to assess intravascular volume status is described. Pulse oximeters providing a continuous display of the pulse waveform offer a new method of estimating relative volume status during positive-pressure ventilation. Like intraarterial pressure tracings, the peaks of the pulse waveform demonstrate increased variation in response to positive-pressure ventilation when a patient becomes hypovolemic. Pulse oximeter waveform tracings were compared with central venous pressure and intraarterial pressure tracings in 12 patients undergoing major operative procedures. A significant correlation (r = 0.61) was seen between pulse waveform variation and systolic pressure variation, which has previously been shown to be a sensitive indicator of hypovolemia. When data from individual patients were analyzed separately, the correlation between pulse waveform variation and systolic pressure variation was as high as 0.88.
Partridge
B L
BL
Department of Anesthesiology, University of California, San Diego Medical Center 92103.
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000768:Anesthesia, General; D001811:Blood Volume Determination / Q000379:methods*; D005260:Female; D006439:Hemodynamics; D006801:Humans; D007431:Intraoperative Complications / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D010092:Oximetry / Q000379:methods*; D012769:Shock / Q000175:diagnosis