Acute Caremiddle twist
A 71-year-old man collapses in the radiology department and is apnoeic with a palpable carotid pulse. You are first to arrive with a self-inflating bag, mask and oxygen. You apply head tilt with chin lift, insert a correctly sized oral airway, and attach oxygen at 15 L/min with the reservoir bag inflated. He has a thick beard. You squeeze the bag and the chest does not move. Which one of the following should you do next to make your ventilation effective?