Conversion to shockable rhythms is associated with better outcomes in out-of-hospital cardiac arrest patients with initial asystole but not in those with pulseless electrical activity. (October 2016)

• Record Type: Journal Article
• Authors: Zheng, Ruiying; Luo, Shengyuan; Liao, Jinli; Liu, Zhihao; Xu, Jia; Zhan, Hong; Liao, Xiaoxing; Xiong, Yan; Idris, Ahamed
• Is Part Of: Resuscitation. Volume 107(2016)
• Page Start: 88
• Page End: 93
• Publication Date: 2016-10
• Subjects: Defibrillation -- Pulseless electrical activity -- Asystole -- Outcomes -- Cardiac arrest; Resuscitation -- Periodicals; Resuscitation -- Periodicals; Réanimation -- Périodiques; Electronic journals; 616.025
• DOI: 10.1016/j.resuscitation.2016.08.008
• Languages: English
• ISSNs: 0300-9572

Abstract

Abstract: Background: The prognostic implication of conversion from initially non-shockable to shockable rhythms in patients with out-of-hospital cardiac arrest (OHCA) remains unclear. Our objective is to determine whether the conversion to shockable rhythms is a reliable predictor of short- and long-term outcomes both in patients who initially presented with pulseless electrical activity (PEA) and in those with asystole. Methods: A secondary analysis was performed on non-traumatic OHCA cases ≥18 years old with PEA or asystole as initial rhythms, who were treated in the field and enrolled in the Resuscitation Outcomes Consortium (ROC) PRIMED study (clinicaltrials.gov/ct2/show/NCT00394706 ). We reported the characteristics and outcomes for those patients with or without shocks delivered in the field. Logistic regression analysis assessed the association of shock delivery with pre-hospital return of spontaneous circulation (ROSC), survival to hospital discharge and favorable neurological outcome as well. Results: Of the 9902 included cases, 3415 (34.5%) were initially in PEA and 6487 (65.5%) were in asystole. 744 (21.8%) PEA and 1134 (17.5%) asystolic patients underwent rhythm conversions and received subsequent shocks. For asystolic patients, the adjusted odds ratios (ORs) of shock delivery for pre-hospital ROSC, survival to discharge and favorable neurological outcome were 1.862 (95%CI 1.590–2.180), 3.778 (95%CI 2.374–6.014) and 4.154 (95%CI 2.192–7.871) respectively, while for PEA patients they were 0.951 (95%CI 0.796–1.137), 1.115 (95%CI 0.720–1.726) and 1.373 (95%CI 0.790–2.385) respectively. Conclusions: Conversion to shockable rhythms was associated with better outcomes in initially asystolic OHCA patients, whereas such associations were not observed in patients initially in PEA.