Final answer:
To give abdominal thrusts to a choking adult, position your fist just above their navel and below the ribcage. Wrap your other hand around their waist and perform quick inward and upward thrusts. If unsuccessful, seek emergency medical help immediately.
Step-by-step explanation:
When you give care to an adult who is responsive and choking, the correct position for your fist when performing abdominal thrusts is just above the navel and below the ribcage. Make sure to position your fist with the thumb side against the abdomen. From behind, wrap your other hand around the waist of the person and pull inward and upward with quick thrusts. This procedure, known as the Heimlich maneuver, is used to dislodge an object from a person's airway when they are choking.
If back slaps and encouragement to cough do not clear the airway, and the person is still able to breathe or cough, continue with abdominal thrusts. If the person is unable to breathe, cough, or make any noise, it is crucial to call for emergency medical care immediately and continue with the abdominal thrusts until help arrives or the obstruction is removed.