For adults the ratio of chest compressions-to-ventilation in case of single rescuer Cardiopulmonary Resuscitation (CPR) is:

Correct option is C

Ans. (c) Sol. The correct chest compressions-to-ventilation ratio for adults in single rescuer CPR is 30:2, meaning 30 chest compressions are given followed by 2 rescue breaths.
Explanation of each option:
· (a) 15:2 – Incorrect. This ratio is used for infant CPR but not for adults. For adults, the ratio is 30:2.
· (b) 15:1 – Incorrect. This ratio does not apply to adult CPR. The ratio for adult CPR is 30:2.
· (c) 30:2 – Correct. For adults, the ratio of chest compressions to ventilations in single rescuer CPR is 30:2.
· (d) 30:1 – Incorrect. A 30:1 ratio does not apply to CPR for adults, as 2 ventilations are required after 30 compressions.