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RSI originated in the anesthesia literature to prevent aspiration in unprepped patients undergoing general anesthesia. From the first anecdotal reports of p-RSI in 1972, prehospital intubation has matured into widespread use. The often conflicting outcome data underscored the need to standardize the approach to p-RSI.
BPPV was first described by Barany in 1921. The characteristic nystagmus and vertigo associated with positioning changes were attributed at that time to the otolithic organs. In 1952, Dix and Hallpike performed the provocative positional testing named in their honor, shown below.