• Pang Philip Y K PYK Department of Cardiothoracic Surgery, National Heart Centre, Singapore; Section of Cardiac Surgery, Yale University School of Medicine, New Haven, Con, Gillian H L Wee, Ming Jie Huang, Anne E E Hoo, Ismail Mohamed Tahir Sheriff, See Lim Lim, Teing Ee Tan, Yee Jim Loh, Chao Victor T T VTT Department of Cardiothoracic Surgery, National Heart Centre, Singapore., Jia Lin Soon, Ka Lee Kerk, Zakir Hussain Abdul Salam, Yoong Kong Sin, and Chong Hee Lim.
• Department of Cardiothoracic Surgery, National Heart Centre, Singapore; Section of Cardiac Surgery, Yale University School of Medicine, New Haven, Connecticut, USA. Electronic address: philip.pang.y.k@nhcs.com.sg.
• Heart Lung Circ. 2017 Aug 1; 26 (8): 817-824.

BackgroundLimited data exists on patients receiving therapeutic hypothermia during extracorporeal life support (ECLS). We investigated outcomes and prognostic factors in these patients.MethodsA retrospective review was conducted for 225 consecutive adult patients treated with ECLS between July 2003 and January 2016. Extracorporeal life support was initiated for refractory cardiac arrest (>10 mins) in 79 patients (35.1%). Patient demographics, ECLS-related complications, in-hospital mortality and neurological outcomes were analysed.ResultsThe mean age was 49.9±12.4 years. Sixty-two patients (78.5%) were male. The mean duration of CPR and ECLS were respectively, 32.0±23.3 mins and 5.4±4.0 days. Therapeutic hypothermia (34oC) was maintained for 24hours in 14 patients (17.7%). Thirty-five patients (44.3%) were weaned off ECLS. Twenty-one patients (26.6%) survived to hospital discharge with 16 (20.3%) recovering good neurological function. Compared to ECLS at normothermia, neurologically favourable survival was higher in the hypothermia group (42.9% vs 15.4%, p=0.020). Multivariable analysis identified a non-shockable rhythm [odds ratio (OR) 5.1, confidence interval (CI) 1.5-16.8], ischaemic hepatitis (OR 6.2, CI 1.1-33.6) and hypoxic ischaemic encephalopathy (OR 5.1, CI 1.5-17.1) as predictors of in-hospital mortality. Therapeutic hypothermia (OR 4.9, CI 1.2-20.4) and acute renal failure (OR 0.19, CI 0.05-0.70) were predictors of neurologically favourable survival.ConclusionsIn this report of patients treated with ECLS, in-hospital survival and survival with good neurological performance were 26.6% and 20.3% respectively. A non-shockable rhythm, ischaemic hepatitis and hypoxic ischaemic encephalopathy were predictors of in-hospital mortality. Therapeutic hypothermia during ECLS was associated with improved neurological outcomes.Copyright © 2017 Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS) and the Cardiac Society of Australia and New Zealand (CSANZ). Published by Elsevier B.V. All rights reserved.

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