What is the correct way to perform back blows on an unconscious adult?

The correct method for performing back blows on an unconscious adult involves using the heel of your hand to strike firmly between the scapulae. This technique is specifically designed to create enough force to expel an obstruction from the airway, in cases where a person is choking. The back blows should be delivered with a consistent rhythm and sufficient strength to be effective, while ensuring that the individual is in a safe position, typically bent forward.

The rationale behind focusing strikes between the shoulder blades is that this area is most effective for creating a pressure wave in the thoracic cavity which can help dislodge blockages in the airway. Proper technique not only helps maximize the effect of the blows but also minimizes the risk of causing injury to the ribs or spine.

Other methods mentioned in the options, such as striking with a fist, gently slapping the back, or using a quick jab between the ribs, are ineffective for dislodging an obstruction and could lead to injury without providing the necessary assistance. It is important to follow established guidelines and techniques when offering assistance to ensure both the safety of the responder and the person in distress.