Which of the following conditions must exist for gas to move between the alveolus and pulmo-nary capillary?
a. Adequate alveolar ventilation (VA)
b. Difference in partial pressures (pressure gradient)
c. Normal central nervous system (CNS) control mechanism
d. Sufficient amount of blood hemoglobin (Hb)
ANS: B
Diffusion is the process whereby gas molecules move from an area of high partial pressure to an area of low partial pressure.
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A 10-year-old boy arrives in the aid room bleeding from his nose. He states that he did not injure himself and just started bleeding while he was skiing, and that he can't get it to stop. Based on your OEC training, which of the following statements about treating epistaxis is false?
a. The nares, or nostrils should be pressed together just below the bony prominence of the nose. b. You should maintain pressure up to 15 minutes before evaluating ongoing bleeding. c. Your initial treatment is to pack the nose with tightly rolled gauze and then apply direct pressure to the nose. d. The most common mistake in the management of epistaxis is letting go of pressure too soon.
In situations where science did not exist to support a practice, Paramedics and medical directors often used a(n) ____ to think through a situation.
A. analogy B. role play C. experience D. debate