Chest compression fraction: A time dependent variable of survival in shockable out-of-hospital cardiac arrest

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• 作者：Sheldon Cheskes^a ; ^{Sheldon.Cheskes@sunnybrook.ca" class="auth_mail" title="E-mail the corresponding author} ; Robert H. Schmicker^b ; Tom Rea^b ; Judy Powell^b ; Ian R. Drennan^a ; Peter Kudenchuk^b ; Christian Vaillancourt^d ; William Conway^e ; Ian Stiell^d ; Dion Stub^g ; Dan Davis^f ; Noah Alexander^c ; Jim Christenson^c ; the Resuscitation Outcomes Consortium (ROC) investigators
• 关键词：Cardiopulmonary resuscitation ; Heart arrest ; Resuscitation ; Survival
• 刊名：Resuscitation
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：97
• 期：Complete
• 页码：129-135
• 全文大小：527 K

文摘

The role of chest compression fraction (CCF) in resuscitation of shockable out-of-hospital cardiac arrest (OHCA) is uncertain. We evaluated the relationship between CCF and clinical outcomes in a secondary analysis of the Resuscitation Outcomes Consortium PRIMED trial.

Methods

We included patients presenting in a shockable rhythm who suffered OHCA prior to EMS arrival. Multivariable logistic regression was used to determine the relationship between CCF and survival to hospital discharge, return of spontaneous circulation (ROSC), and neurologically intact survival. We also performed a secondary analysis restricted to patients without ROSC in the first 10 min of EMS resuscitation.

Results

Among the 2011 patients, median (IQR) age was 65 (54, 75) years, 78.2% were male, and mean (SD) CCF was 0.71 (0.14). Compared to the reference group (CCF < 0.60), the odds ratio (OR) for survival was 0.49 (95%CI: 0.36, 0.68) for CCF 0.60–0.79 and 0.30 (95%CI: 0.20, 0.44) for CCF ≥ 0.80. Results were similar for outcomes of ROSC and neurologically intact survival. Conversely, when restricted to the cohort who did not achieve ROSC during the first 10 min (n = 1633), compared to the reference group (CCF < 0.60), the OR for survival was 0.79 (95%CI: 0.53, 1.18) for CCF 0.60–0.79 and OR 0.88 (95%CI: 0.56, 1.36) for CCF ≥ 0.80.

Conclusions

In this study of OHCA patients presenting in a shockable rhythm, CCF was paradoxically associated with lower odds of survival. CCF is a complex measure and taken by itself may not be a consistent predictor of good clinical outcomes.