JBL EMT Practice Exam

Compression-to-ventilation ratio refers to the number of chest compressions to the number of rescue breaths given during CPR. During single-rescuer CPR on an adult patient, the recommended ratio is 302, which means 30 chest compressions followed by 2 rescue breaths. This allows for adequate blood circulation and oxygenation in the patient. Option A, 15:2, would not provide enough compressions to maintain adequate circulation, and option D, 15:1, would provide too few rescue breaths. Option C, 5:1, would also not provide enough compressions and may result in ineffective CPR.