Gary Quick, MD-Series Editor

A39-year-old man is brought to theemergency department (ED)after his car struck a tree. He experienceda transient loss of consciousnesswith a 3-minute episode of retrogradeamnesia at the scene of the accident,despite wearing a seat belt andshoulder harness. He was disorientedto date and place.

A 37-year-old woman presents to the emergency departmentwith a diffuse, sharp, pounding headache,which started 2 hours earlier. She rates her discomfort as4 on a scale of 1 to 10. Neck muscle soreness is also present,but the pain does not radiate.