Acute Caremiddle twist
A 47-year-old man chokes on a piece of bread roll while talking at a workplace lunch. He coughs hard for a few seconds, then the coughing becomes silent and his face darkens. He is upright and conscious. You deliver five back blows between the shoulder blades with the heel of your hand, checking after each one; nothing shifts, and between the blows he makes only weak soundless efforts to cough. Which one of the following should you do next?