A clinical observational study found that rescuers consistently hyperventilated patients during out-of-hospital cardiopulmonary resuscitation (CPR). The objective was to quantify excessive ventilation and determine if it reduced coronary perfusion pressure and survival. In humans, the average ventilation rate was 30 ± 3.2 breaths per minute, with a duration of 1.0 ± 0.07 seconds per breath. No patients survived. In animal studies, pigs ventilated at 30 breaths per minute had significantly lower coronary perfusion pressure and survival rates compared to those ventilated at 12 breaths per minute. The study showed that excessive ventilation increased intrathoracic pressure, decreased coronary perfusion, and reduced survival. These findings suggest that hyperventilation during CPR is harmful and may contribute to poor survival rates. The study also highlights the need for education to correct this practice. The results emphasize the importance of proper CPR techniques to improve survival rates.A clinical observational study found that rescuers consistently hyperventilated patients during out-of-hospital cardiopulmonary resuscitation (CPR). The objective was to quantify excessive ventilation and determine if it reduced coronary perfusion pressure and survival. In humans, the average ventilation rate was 30 ± 3.2 breaths per minute, with a duration of 1.0 ± 0.07 seconds per breath. No patients survived. In animal studies, pigs ventilated at 30 breaths per minute had significantly lower coronary perfusion pressure and survival rates compared to those ventilated at 12 breaths per minute. The study showed that excessive ventilation increased intrathoracic pressure, decreased coronary perfusion, and reduced survival. These findings suggest that hyperventilation during CPR is harmful and may contribute to poor survival rates. The study also highlights the need for education to correct this practice. The results emphasize the importance of proper CPR techniques to improve survival rates.