• Fredy-Michel Roten, Richard Steffen, Maren Kleine-Brueggeney, Robert Greif, Marius Wipfli, Andreas Arnold, Henrik Fischer, and Lorenz Theiler.
• Department of Anesthesiology and Pain Therapy, Bern University Hospital and University of Bern, CH-3010, Bern, Switzerland. fredy-michel.roten@insel.ch.
• BMC Anesthesiol. 2019 Apr 11; 19 (1): 52.

BackgroundThe dislocation rate of oral versus nasal airway exchange catheters (AEC) in the postoperative care unit (PACU) are unknown. Our aim was to establish dislocation rates and to assess the usefulness of waveform capnography to detect dislocation.MethodsIn this non-randomized, prospective observational trial at the University Hospital Bern, Switzerland, we included 200 patients admitted to PACU after extubation via AEC, having provided written informed consent. The study was approved by the local ethical committee. AEC position was assessed by nasal fiberoptic endoscopy at beginning of PACU stay and before removal of the AEC. Capnography was continuously recorded via the AEC. Additional measurements included retching and coughing of the patient, and re-intubation, if necessary.ResultsData from 182 patients could be evaluated regarding dislocation. Overall dislocation rate was not different between oral and nasal catheters (7.2% vs. 2.7%, p = 0.16). Retching was more often noted in oral catheters (26% vs. 8%, p < 0.01). Waveform capnography was unreliable in predicting dislocation (negative predictive value 17%). Re-intubation was successful in all five of the nine re-intubations where an AEC was still in situ. In four patients, the AEC was already removed when re-intubation became necessary, and re-intubation failed once, with a front of neck access as a rescue maneuver.ConclusionsWe found no difference in dislocation rate between nasal and oral position of an airway exchange catheter. However, nasal catheters seemed to be tolerated better. In the future, catheters like the staged extubation catheter may further increase tolerance.Trial RegistrationThe study was registered in a clinical study registry ( ISRCTN 96726807 ) on 10/06/2010.

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