Brief Loss of Consciousness
March 31, 2014
April’s Case: It is a busy day in your ED when a 51-year-old woman arrives by EMS. She felt faint while riding her racing bicycle and got off just before losing consciousness. EMS found her conscious, but pale, with a heart rate, 50 beats/min; blood pressure, 90/50 mm Hg; respiratory rate, 25 breaths/min; and oxygen saturation, 98% on room air. EMS provided 1 liter of normal saline without a change in her vital signs. In the ED, her BP is still 90/50 mm Hg. She tells you that just before she got off her bike, she experienced pain in her throat, but she denies chest pain, shortness of breath, or headache. She appears uncomfortable and complains of persisting throat pain and states she is afraid of dying. Her initial ECG shows a sinus bradycardia but is otherwise normal. Her past medical history is not significant. She takes no medications. She is an experienced marathon runner and has never had similar complaints. You wonder what could have caused the syncope and persistent bradycardia.
Share your diagnosis with us in the comments box below. The case conclusion will be published on April 7!