December 2006, Volume 36 Number 12 , p 20 - 20
Miller, Elaine R. RN, MPH; Woo, Emily Jane MD, MPH
Web site last accessed on November 6, 2006.
A HEALTHY TEENAGER received his third dose of hepatitis B vaccine. As he was leaving the clinic a few minutes later, he fainted, fell, and struck his head. When he regained consciousness, he complained of pain in his chest and arms, which was followed by seizure activity and cardiopulmonary arrest. Attempts to resuscitate him failed, and he died.
An autopsy showed frontal lobe contusions and cerebral hemorrhage and edema. The cause of death was a fall and the resulting head injuries. A vasovagal reaction triggered the fall.
A vasovagal reaction is an involuntary nervous system reflex that causes bradycardia, vasodilation, and hypotension, leading to decreased perfusion to the brain. Pain, anxiety, or trauma can trigger vasovagal reactions causing sudden dizziness or syncope.
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