Journal
ANESTHESIA AND ANALGESIA
Volume 99, Issue 1, Pages 166-172Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1213/00000539-200407000-00034
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Automated online tonometry displays a rapid, semicontinuous measurement of gastric-to-end tidal carbon dioxide (Pr-etCO(2)) as an index of gastrointestinal perfusion during surgery. Its use to predict postoperative outcome has not been studied in general surgery patients. We, therefore, studied ASA physical status III-IV patients operated on for elective surgery under general anesthesia and a planned duration of >2 h in a European, multicenter study. As each center was equipped with only 1 tonometric monitor, a randomization was performed if more than one patient was eligible the same day. Patients not monitored with tonometry were assessed only for follow-up. The main outcome measure was the assessment of postoperative functional recovery delay (FRD) on day 8. Among the 290 patients studied, 34% had FRD associated with a longer hospital stay. The most common FRDs were gastrointestinal (45%), infection (39%), and respiratory (35%). In those monitored with tonometry (n = 179), maximum Pr-etCO(2) proved to be the best predictor increasing the probability of FRD from 34% for all patients to 65% at a cut-off of 21 mm Hg (2.8 kPa) (sensitivity 0.27, specificity 0.92, positive predictive value 64%, negative predictive value 70%). We conclude that intraoperative Pr-etCO(2) measurement may be a useful prognostic index of postoperative morbidity.
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