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Connection between first observed rhythm and ratio of return of spontaneous circulation (ROSC). Ventricular fibrillation is a favourable indicator regarding the outcome of resuscitation in both Lucas and manual groups. In the cases of initial asystole, resuscitation by using a Lucas device was significantly more effective. VF: ventricular fibrillation, L: Lucas, PEA: pulseless electrical activity, VT: ventricular tachycardia
