Red Cross, Back Blows 2

From redcross.org (page 10)

Back Blows and Abdominal Thrusts
The responder should take a position slightly behind the victim. Provide support by placing one arm diagonally across the chest and lean the person forward.

The responder should firmly strike the person between the shoulder blades with the heel of the other hand five times. If the back blows do not dislodge the object, give five abdominal thrusts.
Continue to give sets of five back blows and five abdominal thrusts until the object is dislodged and the person can cough forcefully speak or breathe, or until the person becomes unconscious.