Which position is used for patients who feel faint or are at risk for going into shock?

A patient involved in a motor-vehicle collision has suffered the separation of a rib from a spinal vertebra. Based on the anatomy of the spine, where has this injury occurred?

a. The lumbar spine b. The cervical spine c. The middle spine d. The thoracic spine

Your patient has a P(A?a)O2 of 200 mm Hg while breathing 100% O2. What is the estimated percentage shunt?

a. 5% b. 10% c. 20% d. 30%