What is the result of excessive ventilation during resuscitation?

Excessive ventilation during resuscitation leads to increased intrathoracic pressure. This occurs because the lungs are being over-inflated, causing the pressure inside the thoracic cavity to rise. The elevated intrathoracic pressure can impede venous return to the heart, making it more difficult for the heart to fill with blood. As a result, this can reduce cardiac output, as there is less blood available for the heart to pump out.

When intrathoracic pressure increases, it can also affect the effectiveness of chest compressions during cardiopulmonary resuscitation (CPR). Optimal venous return and circulation are crucial for effective resuscitation, so maintaining appropriate ventilation is key to successful outcomes.