Certified Hyperbaric Technologist Test CHT Hyperbaric Medicine and Indications 2

Question 1

Which gas law explains the mechanical reduction in bubble volume that occurs during hyperbaric oxygen therapy for arterial gas embolism?

Accepted Answer

Boyle's law

Answer

Boyle's law states that gas volume is inversely proportional to pressure, so increasing chamber pressure shrinks intravascular bubbles.

Question 2

Carbon monoxide poisoning is an approved HBO indication primarily because increased pressure does what?

Accepted Answer

Dissolves more oxygen in plasma and speeds COHb dissociation

Answer

HBO raises dissolved plasma oxygen and accelerates the displacement of carbon monoxide from hemoglobin.

Question 3

Which of the following is an UHMS-approved indication for hyperbaric oxygen therapy?

Accepted Answer

Crush injury and acute traumatic ischemia

Answer

Crush injury and acute traumatic ischemia is an established UHMS-approved indication for adjunctive HBO.

Question 4

In treating decompression sickness, the U.S. Navy Treatment Table 6 is most commonly initiated at what pressure?

Accepted Answer

2.8 ATA (60 fsw)

Answer

Treatment Table 6 begins at 2.8 ATA, equivalent to 60 feet of seawater, on 100% oxygen.

Question 5

Why is hyperbaric oxygen beneficial in clostridial myonecrosis (gas gangrene)?

Accepted Answer

High oxygen tension inhibits alpha-toxin and anaerobic bacterial growth

Answer

Elevated tissue oxygen tension halts alpha-toxin production and suppresses growth of the anaerobic Clostridium organisms.

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