• Analena Beitz, Andrea Riphaus, Alexander Meining, Tim Kronshage, Christoph Geist, Stefan Wagenpfeil, Andreas Weber, Andreas Jung, Monther Bajbouj, Christian Pox, Gerhard Schneider, Roland M Schmid, Till Wehrmann, and Stefan von Delius.
• Medizinische Klinik und Poliklinik, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.
• Am. J. Gastroenterol. 2012 Aug 1;107(8):1205-12.

ObjectivesThe aim of this randomized study was to determine whether intervention based on additional capnographic monitoring reduces the incidence of arterial oxygen desaturation during propofol sedation for colonoscopy.MethodsPatients (American Society of Anesthesiologists classification (ASA) 1-3) scheduled for colonoscopy under propofol sedation were randomly assigned to either a control arm with standard monitoring (standard arm) or an interventional arm in which additional capnographic monitoring (capnography arm) was available. In both study arms, detection of apnea or altered respiration induced withholding propofol administration, stimulation of the patient, chin lift maneuver, or further measures. The primary study end point was the incidence of arterial oxygen desaturation (defined as a fall in oxygen saturation (SaO(2)) of ≥5% or <90%); secondary end points included the occurrences of hypoxemia (SaO(2) <90%), severe hypoxemia (SaO(2) ≤85%), bradycardia, hypotension, and the quality of sedation (patient cooperation and patient satisfaction).ResultsA total of 760 patients were enrolled at three German endoscopy centers. The intention-to-treat analysis revealed a significant reduction of the incidence of oxygen desaturation in the capnography arm in comparison with the standard arm (38.9% vs. 53.2%; P<0.001). The numbers of patients with a fall in SaO(2) <90% and ≤85% were also significantly different (12.5% vs. 19.8%; P=0.008 and 3.7 vs. 7.8%; P=0.018). There were no differences regarding the rates of bradycardia and hypotension. Quality of sedation was similar in both groups. Results of statistical analyses were maintained for the per-protocol population.ConclusionsAdditional capnographic monitoring of ventilatory activity reduces the incidence of oxygen desaturation and hypoxemia during propofol sedation for colonoscopy.

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