What condition occurs when air pressure in the hollow spaces of the body (such as the middle ear and sinuses) rises too high or drops too low due to a diving accident?

Which of the following countries has the easiest access to see a specialist physician?

a. United States b. Canada c. France d. Great Britain

Typically, the highest continuous positive airway pressure (CPAP) pressure used for therapy is:

A) 2 cmH2O. B) 5 cmH2O. C) 10 cmH2O. D) 20 cmH2O.