What is an important factor to remember when performing CPR on an adult?

When performing CPR on an adult, ensuring that the surface is firm is crucial for effective chest compressions. A firm surface allows for adequate depth and recoil of the chest, which is necessary for blood circulation during compression. If compressions are given on a soft or uneven surface, such as a bed or couch, they may be ineffective because the compression may not fully compress the heart between the ribs as needed, thereby reducing the amount of blood being pumped to vital organs.

Additionally, a firm surface helps stabilize the body, allowing the rescuer to maintain a proper hand position and apply the necessary force effectively. This significantly increases the chances of successful resuscitation efforts.

The other choices—performing compressions slowly, using fingers instead of palms, and only performing rescue breaths—do not align with CPR guidelines and can compromise the effectiveness of the procedure. Compressions should be performed at a rate of 100 to 120 per minute, with a depth of at least 2 inches. CPR requires the use of the palms to generate sufficient force, and rescue breaths are to be administered in conjunction with chest compressions, not exclusively.