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Recent research suggests that minimizing interruptions during cardiopulmonary resuscitation improves coronary perfusion pressure and increases the likelihood of return of spontaneous circulation (ROSC). The Kansas City, Missouri, emergency medical services system changed its cardiac arrest protocol to emphasize early chest compressions and de-emphasize airway management for resuscitation of adult patients with primary cardiac arrest (ventricular fibrillation [VF] or pulseless ventricular tachycardia). Changes included increasing the compression-to-ventilation ratio from 5:1 to 50:2 (with 200 mandatory compressions without interruption), managing the airway initially with only a nonrebreather mask followed by bag-mask ventilation, and not at…