CHT Hyperbaric Medicine Fundamentals 4

Question 1

At sea level (1 ATA), a rigid container holds 10 L of gas. If pressure is increased to 3 ATA, what is the new volume (Boyle's Law)?

Accepted Answer

3.3 L

Answer

P1V1 = P2V2 → (1)(10) = (3)(V2) → V2 = 10/3 ≈ 3.3 L.

Question 2

Which wound type has the strongest FDA-cleared and clinical evidence supporting adjunctive HBO therapy?

Accepted Answer

Wagner grade 3-4 diabetic foot ulcers

Answer

Wagner grade 3–4 diabetic foot ulcers are among the best-documented HBO indications with demonstrated limb-salvage benefit.

Question 3

Which gas law is most directly applied when calculating the total pressure of a gas mixture in a hyperbaric chamber?

Accepted Answer

Dalton's Law of Partial Pressures

Answer

Dalton's Law states total pressure equals the sum of individual partial pressures of all gases in the mixture.

Question 4

A patient reports ear pain and inability to equalize during chamber compression. The correct technician response is to:

Accepted Answer

Halt compression, allow slight decompression, and coach equalization techniques

Answer

Stopping and allowing slight decompression gives the middle ear time to equalize, preventing barotrauma to the tympanic membrane.

Question 5

Which biochemical mechanism explains HBO's role in enhancing leukocyte killing of bacteria in hypoxic tissues?

Accepted Answer

HBO restores the oxygen-dependent oxidative burst of neutrophils

Answer

Neutrophils require adequate PO2 to generate reactive oxygen species for bacterial killing; HBO restores this function in hypoxic wounds.

(CHT) Certified Hyperbaric Technician Practice Test