Physiology Which of the following is not true about cardiopulmonary resuscitation (CPR)? A Closed chest massage is as effective as open chest massage B The success rate for out-of-hospital resuscitation may be as high as 30% to 60% C The most common cause of sudden death is ischemic hea disease D Standard chest massage generally provides less than 15% of normal coronary and cerebral blood flow 💡 Explanation Which of the following is not true about cardiopulmonary resuscitation (CPR)? ✓ Correct Answer: A. Closed chest massage is as effective as open chest massage