During CPR, what fraction of normal blood flow is accomplished through chest compressions?

Chest compressions during cardiopulmonary resuscitation (CPR) are critical for maintaining some level of blood circulation when the heart has stopped beating effectively. When the heart is unable to pump blood normally, chest compressions help to manually circulate blood throughout the body, especially to vital organs like the brain and heart itself.

Research indicates that effective chest compressions can generate approximately one-third of normal blood flow. This fraction indicates that while compressions are not as efficient as the heart's natural pumping action, they still provide significant support for blood circulation until more advanced medical intervention can take place and restore normal cardiac function.

This understanding aligns with CPR guidelines, which emphasize the importance of high-quality chest compressions at the recommended rate and depth to maximize blood flow during the resuscitation efforts.