The compression to ventilation ratio during CPR is:

5:2

15:2

30:2

5:5

Cardiopulmonary Resuscitation is meant CPR
***
The compression to ventilation ratio during CPR is: 15:2
More than a hundred times per minute should be the rate of chest compression while doing CPR
Prolong CPR is suggested for a patient with Electric Shock
You should compress the chest about 1.5 inches or 4 cm.