Think CPAP Mask After Major Abdominal Surgery

Posted by Clark Venable on 2/13/2005

JAMA just published Continuous positive airway pressure for treatment of postoperative hypoxemia: a randomized controlled trial and those of us giving anesthesia for open major abdominal surgery should take note. Here's the abstract:

" Results Patients who received oxygen plus continuous positive airway pressure had a lower intubation rate (1% vs 10%; P = .005; relative risk [RR], 0.099; 95% confidence interval [CI], 0.01-0.76) and had a lower occurrence rate of pneumonia (2% vs 10%, RR, 0.19; 95% CI, 0.04-0.88; P = .02), infection (3% vs 10%, RR, 0.27; 95% CI, 0.07-0.94; P = .03), and sepsis (2% vs 9%; RR, 0.22; 95% CI, 0.04-0.99; P = .03) than did patients treated with oxygen alone. Patients who received oxygen plus continuous positive airway pressure also spent fewer mean (SD) days in the intensive care unit (1.4 [1.6] vs 2.6 [4.2], P = .09) than patients treated with oxygen alone. The treatments did not affect the mean (SD) days that patients spent in the hospital (15 [13] vs 17 [15], respectively; P = .10). None of those treated with oxygen plus continuous positive airway pressure died in the hospital while 3 deaths occurred among those treated with oxygen alone (P = .12). "

I remember the first time someone suggested using CPAP for the struggling patient in the recovery room after major abdominal surgery. I snorted and mumbled something under my breath about how the patient needed an endotracheal tube and should have taken the offered thoracic epidural. I went back to bed, convinced that I'd be called in an hour or two to intubate the patient who would by then certainly be in extremis. You know what? They never called me that night and this paper helps me understand why.

I think I need to modify my internal algorithm for post-anesthesia management of these often difficult cases to reflect the option of CPAP as a middle ground between mask oxygen and endotracheal intubation.

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