An acute drop in the PB and PAO2 are the primary reasons for high-altitude illness experienced by un-acclimatized persons.

Drugs for inhalation that are gases administered by the AEMT would include which of the following?

A) Oxygen B) Nitrous oxide C) Carbon dioxide D) Both A and B

A common cause of hearing loss in the elderly is presbycusis, which is defined as:

A) a progressive loss of hearing, particularly in the low frequencies, which explains why their television is turned up. B) an acute hearing impairment caused by idiopathic rupture of the tympanic membrane in the middle part of the ear. C) a degenerative condition in which the person experiences difficulty hearing both low and high frequency sounds. D) loss of high-frequency sounds and the inability to differentiate a particular sound from background noise.