• Ary Serpa Neto, Pedro P Z A Campos, Sabrine N T Hemmes, Lieuwe D Bos, Thomas Bluth, Marion Ferner, Andreas Güldner, Markus W Hollmann, Inmaculada India, Thomas Kiss, Rita Laufenberg-Feldmann, Juraj Sprung, Demet Sulemanji, Carmen Unzueta, Marcos F Vidal Melo, Toby N Weingarten, BoerAnita M Tuip-deAM, Paolo Pelosi, Gama de AbreuMarceloM, Marcus J Schultz, and PROVE Network Investigators.
• From the Department of Critical Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil (ASN, PPZAC), the Department of Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands (ASN, PPZAC, SNTH, LDB, MJS), the Program of Post-Graduation, Innovation and Research, Faculdade de Medicina do ABC, Santo André, Brazil (ASN), the Department of Anesthesiology (SNTH, MWH), the Laboratory of Experimental Intensive Care and Anesthesiology, University of Amsterdam, Amsterdam, The Netherlands (LDB, AMTB, MJS), the Department of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany (TB, AG, TK, MGA), the Interdisciplinary Center for Clinical Trials (IZKS), University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany (MF), the Department of Anaesthesiology, Hospital de Sant Pau, Barcelona, Spain (II, CU), the Department of Anaesthesiology, University Hospital Medical Centre of the Johannes Gutenberg University Mainz, Mainz, Germany (RL), the Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota (JS, TNW), the Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA (DS, MFVM), and the Department of Surgical Sciences and Integrated Diagnostics, IRCCS San Martino IST, University of Genoa, Genoa, Italy (PP).
• Eur J Anaesthesiol. 2017 Apr 1; 34 (4): 229-238.

BackgroundPostoperative pulmonary complications (PPCs) are common after major abdominal surgery. The kinetics of plasma biomarkers could improve identification of patients developing PPCs, but the kinetics may depend on intraoperative ventilator settings.ObjectiveTo test whether the kinetics of plasma biomarkers are capable of identifying patients who will develop PPCs, and whether the kinetics depend on the intraoperative level of positive end-expiratory pressure (PEEP).DesignA preplanned substudy of a randomised controlled trial.SettingOperation room of five centres.PatientsTwo hundred and forty-two adult patients scheduled for abdominal surgery at risk of developing PPCs.InterventionsHigh (12 cmH2O) versus low (≤2 cmH2O) levels of PEEP.Main Outcome MeasuresIndividual PPCs were combined as a composite endpoint. Plasma samples were collected before surgery, directly after surgery and on the fifth postoperative day. The levels of the following were measured: tumour necrosis factor (TNF)-α, interleukin (IL)-6 and IL-8, the soluble form of the Receptor for Advanced Glycation End-products (sRAGE), Surfactant Protein (SP)-D, Clara Cell protein (CC)-16 and Krebs von den Lungen 6 (KL6).ResultsBlood sampling was complete in 242 patients: 120 patients in the high PEEP group and 122 patients in the low PEEP group. Increases in plasma levels of TNF- IL-6, IL-8 and CC-16, and a decrease in plasma levels of SP-D were greater in patients who developed PPCs; however, the area under the receiver operating characteristic curve was low for all biomarkers. CC-16 was the only biomarker whose level increased more in patients who had received high levels of PEEP.ConclusionIn patients undergoing abdominal surgery and at risk of developing PPCs, plasma levels of biomarkers for inflammation or lung injury showed distinct kinetics with development of PPCs, but none of the biomarkers showed sufficient prognostic value. The use of high levels of PEEP was associated with increased levels of CC-16, suggesting lung overdistension.Trial RegistrationThe PROVHILO trial, including this substudy, was registered at clinicaltrials.gov (NCT01441791).

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