What is the most effective positioning for CPR on an adult patient?

The most effective positioning for CPR on an adult patient is flat on the back on a firm surface. This position allows the rescuer to perform high-quality chest compressions, which are critical for maintaining blood circulation during cardiac arrest. When the patient is on a firm surface, it provides the necessary resistance for effective compressions, ensuring that the chest can fully recoil between compressions to maximize blood flow.

Being flat on the back also opens the airway, making it easier to perform rescue breaths if they are required. This is important because airway obstruction can occur in patients experiencing cardiac arrest. Performing CPR in this position enhances the efficacy of the compressions and optimizes the chances of resuscitation.

Other positions, such as being on their side in the recovery position, sitting upright in a chair, or lying on a soft surface like a bed, would compromise the quality of chest compressions and may hinder the overall effectiveness of the resuscitation efforts.