A syncopal reaction is one of the more common adverse reactions that blood donors experience. The American Red Cross (ARC) uses a number of criteria to describe the event.
(1) clinical features
(2) loss of consciousness (faint)
(4) recovery period
Clinical features with presyncope (prefaint):
(3) sweating (diaphoresis)
(4) light headedness
(6) nausea and/or vomiting
Loss of Consciousness
prefaint or presyncope
< 1 minute
>= 1 minute
Loss of consciousness may be accompanied by:
(2) loss of bladder or bowel control
Injuries that may occur:
(1) head injury
The recovery is considered prolonged if it takes more than 30 minutes.
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Specialty: Clinical Laboratory