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The relationship between chest compression fraction and outcome from ventricular fibrillation arrests in prolonged resuscitations. | LitMetric
Background : Guidelines direct rescuers to minimize CPR interruptions during resuscitation. There is little evidence that evaluates the relationship of increasing CPR fraction among patients with relatively high fractions or prolonged resuscitation.Methods : We conducted an observational study of persons who suffered out-of-hospital ventricular fibrillation arrest and required >5 min of emergency medical services (EMS) CPR for persistent pulselessness. We determined the association between hands-on CPR fraction and outcomes of spontaneous circulation, survival to hospital discharge, and neurologically favorable survival. Analyses were stratified by median hands-on CPR and were conducted for those who required 5, 10, and 20 min of EMS CPR for persistent pulselessness.Results : Of 414 potentially eligible patients, 323 (78%) required >5 min of EMS CPR, 234 (56%) required >10 min of EMS CPR, and 153 (37%) required EMS CPR for >20 min. The median CPR fraction was 81%. We did not observe a significant association for the outcomes of hospital survival and neurologically favorable survival for the 5-min and 10-min groups. When restricted to patients who required >20 min of EMS CPR, the half who received a higher hands-on CPR fraction were more likely to achieve spontaneous circulation (40% versus 18%, p=0.004), survival to hospital discharge (20% versus 8%, p=0.03), and neurologically favorable survival (20% versus 7%, p=0.02).Conclusion : Over one-third required 20 min of persistent EMS CPR. The EMS was able to achieve a high hands-on CPR fraction in the context of advanced therapies. Those who required the most prolonged EMS CPR appeared to benefit from greater hands-on CPR fraction.
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