Which position should an adult victim be in for effective chest compressions during CPR?

For effective chest compressions during CPR, the adult victim should be positioned on their back on a firm surface. This position allows the lifeguard or rescuer to apply compressions directly over the center of the chest, which is crucial for ensuring that the compressions can adequately circulate blood and provide the necessary force to maintain blood flow to vital organs.

When the victim is lying flat on their back, the sternum can be effectively compressed without obstruction, and the rescuer has better leverage and body mechanics to deliver the compressions at the appropriate depth and rate. A firm surface is essential because it prevents the chest from sinking during compressions, facilitating maximum effectiveness.

Other positions, such as lying on the side or standing upright, would not allow for the appropriate technique or force needed for chest compressions, making them ineffective for CPR. Similarly, a sitting position would not provide the necessary access to the chest and could hinder the ability to perform compressions correctly.