During abdominal thrusts, which part of the fist is used against the patient?

The correct answer is the thumb side of the fist. When performing abdominal thrusts, also known as the Heimlich maneuver, the rescuer forms a fist using one hand and places the thumb side against the midline of the abdomen, just above the navel of the person who is choking. The location and positioning are critical for the effectiveness of the thrusts.

Using the thumb side provides a solid surface for delivering upward thrusts aimed at creating pressure in the abdomen. This pressure can help expel the obstruction in the airway. Proper alignment and force generation are essential; hence, using the thumb side facilitates a strong, controlled thrust without the risk of applying pressure incorrectly or causing injury to the body.