Effect of early postextubation high-flow nasal cannula vs conventional oxygen therapy on hypoxaemia in patients after major abdominal surgery: a French multicentre randomised controlled trial (OPERA)
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High-flow nasal cannula (HFNC) oxygen therapy is attracting increasing interest in acute medicine as an alternative to standard oxygen therapy; however, its use to prevent hypoxaemia after major abdominal surgery has not been evaluated. Our trial was designed to close this evidence gap.
A multicentre randomised controlled trial was carried out at three university hospitals in France. Adult patients at moderate to high risk of postoperative pulmonary complications who had undergone major abdominal surgery using lung-protective ventilation were randomly assigned using a computer-generated sequence to receive either HFNC oxygen therapy or standard oxygen therapy (low-flow oxygen delivered via nasal prongs or facemask) directly after extubation. The primary endpoint was absolute risk reduction (ARR) for hypoxaemia at 1 h after extubation and after treatment discontinuation. Secondary outcomes included occurrence of postoperative pulmonary complications within 7 days after surgery, the duration of hospital stay, and in-hospital mortality. The analysis was performed on data from the modified intention-to-treat population. This trial was registered with ClinicalTrials.gov (NCT01887015).
Between 6 November 2013 and 1 March 2015, 220 patients were randomly assigned to receive either HFNC (n = 108) or standard oxygen therapy (n = 112); all of these patients completed follow-up. The median duration of the allocated treatment was 16 h (interquartile range 14–18 h) with standard oxygen therapy and 15 h (interquartile range 12–18) with HFNC therapy. Twenty-three (21 %) of the 108 patients treated with HFNC 1 h after extubation and 29 (27 %) of the 108 patients after treatment discontinuation had postextubation hypoxaemia, compared with 27 (24 %) and 34 (30 %) of the 112 patients treated with standard oxygen (ARR 4, 95 % CI –8 to 15 %; p = 0.57; adjusted relative risk [RR] 0.87, 95 % CI 0.53–1.43; p = 0.58). Over the 7-day postoperative follow-up period, there was no statistically significant difference between the groups in the proportion of patients who remained free of any pulmonary complication (ARR 7, 95 % CI –6 to 20 %; p = 0.40). Other secondary outcomes also did not differ significantly between the two groups.
Among patients undergoing major abdominal surgery, early preventive application of high-flow nasal cannula oxygen therapy after extubation did not result in improved pulmonary outcomes compared with standard oxygen therapy.
KeywordsPostoperative hypoxaemia Oxygen therapy Postoperative pulmonary complications Perioperative medicine High-risk surgery
The OPERA trial investigators would like to thank all patients who participated in the study, and the clinical and research coordinators at all participating sites, especially Dominique Morand (Direction de la Recherche Clinique, DRC, Clermont-Ferrand, France), Albert Prades (Montpellier University Hospital, Montpellier, France) as well as the nurses and medical staff at all of the participating sites, without whom the OPERA study would never have been completed.
Compliance with ethical standards
Conflicts of interest
All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. EF reports receiving consulting fees from Fresenius kabi, and lecture fees from General Electrics Heathcare and Fresenius kabi, nonfinancial support from Drager, and reimbursement of travel expenses from Fisher and Paykel Healthcare. CPB reports receiving consulting fees from Merck Sharp & Dohme, Baxter Gambro and Astellas. TG reports receiving a research grant from LFB Bio-medicaments and meeting support (reimbursement of travel costs) from Baxter Gambro. SJ reports receiving consulting fees from Drager, Maquet, Hamilton and Fisher and Paykel Healthcare, lecture fees from Abbott and Philips, and reimbursement of travel expenses from Pfizer. The other authors declare no competing interests.
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