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Huang FY, Huang BT, Wang PJ, Zuo ZL, Heng Y, Xia TL, Gui YY, Lv WY, Zhang C, Liao YB, Liu W, Chen M, Zhu Y. The efficacy and safety of prehospital therapeutic hypothermia in patients with out-of-hospital cardiac arrest: A systematic review and meta-analysis. Resuscitation 2015; 96:170-9. [PMID: 26300235 DOI: 10.1016/j.resuscitation.2015.08.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 08/05/2015] [Accepted: 08/06/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND The benefit of therapeutic hypothermia (TH) to patients suffering out-of-hospital cardiac arrest (OHCA) has been well established. However, the effect of prehospital cooling remains unclear. We aimed to investigate the efficacy and safety of prehospital TH for OHCA patients by conducting a systematic review of randomised controlled trials (RCTs). METHODS The MEDLINE, EMbase and CENTRAL databases were searched for publications from inception to April 2015. RCTs that compared cooling with no cooling in a prehospital setting among adults with OHCA were eligible for inclusion. Random- and fixed-effect models were used depending on inter-study heterogeneity. RESULTS Eight trials that recruited 2379 participants met the inclusion criteria. Prehospital TH was significantly associated with a lower temperature at admission (mean difference (MD) -0.94; 95% confidence interval (CI) -1.06 to -0.82). However, survival upon admission (Risk ratio (RR) 1.01, 95%CI 0.98-1.04), survival at discharge (RR 1.02, 95%CI 0.91-1.14), in-hospital survival (RR 1.05, 95%CI 0.92-1.19) and good neurological function recovery (RR 1.06, 95% CI 0.91-1.23) did not differ between the TH-treated and non-treated groups. Prehospital cooling increased the incidence of recurrent arrest (RR 1.23, 95%CI 1.02-1.48) and decreased the PH at admission (MD -0.04, 95%CI -0.07 to -0.02). Pulmonary oedema did not differ between the arms (RR 1.02, 95%CI 0.67-1.57). None of the potentially controversial issues (cooling methods, time of inducing TH, the proportion of continuing cooling in hospital, actual prehospital infusion volume and primary cardiac rhythms) affected the efficacy. CONCLUSION Evidence does not support the administration of prehospital TH to patients with OHCA.
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Affiliation(s)
- Fang-Yang Huang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Bao-Tao Huang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Peng-Ju Wang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Zhi-Liang Zuo
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yue Heng
- Department of Family Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Tian-Li Xia
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yi-Yue Gui
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Wen-Yu Lv
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Chen Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yan-Biao Liao
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Wei Liu
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Mao Chen
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China.
| | - Ye Zhu
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China.
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