38 These findings of strict patient selection are reinforced by a meta-analysis that observed a negative trend in survival when manual CPR was done for more than 30 minutes, 39 and another in which favorable neurologic survival decreased from more than 30% to around 15% when arrest to E-CPR time exceeded 40 minutes. 40 Patient age was also associated with decreased 1-month survival in another study that concluded that patients who are older than 70 may not be suitable candidates for E-CPR. 41 The identification and validation of prognostic markers of E-CPR outcomes would be valuable to inform patient selection.
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