CHT Hyperbaric Medicine Fundamentals 5

Question 1

Which is a recognized RELATIVE contraindication to hyperbaric oxygen therapy that requires careful risk-benefit evaluation?

Accepted Answer

Concurrent bleomycin chemotherapy

Answer

Bleomycin sensitizes lung tissue to oxygen toxicity, making HBO potentially dangerous and requiring oncology consultation before use.

Question 2

The oxygen window concept in decompression theory refers to:

Accepted Answer

The unsaturated partial pressure of inert gas that allows bubble reabsorption

Answer

The oxygen window is the partial pressure vacancy created when O2 is metabolized, which drives inert gas elimination from tissues.

Question 3

At what depth in feet of seawater (FSW) does 1 additional atmosphere of pressure accumulate?

Accepted Answer

33 FSW

Answer

Every 33 FSW (approximately 10 meters of seawater) adds 1 ATA of hydrostatic pressure.

Question 4

Which effect of HBO on red blood cells improves oxygen delivery beyond what hemoglobin alone can provide?

Accepted Answer

HBO dissolves additional oxygen directly in plasma

Answer

At 3 ATA with 100% O2, plasma can carry approximately 6 vol% of dissolved O2, enough to meet resting tissue needs without hemoglobin.

Question 5

A multiplace chamber requires patients breathing 100% O2 to use a mask or hood because:

Accepted Answer

The chamber is pressurized with air, so patients must receive O2 separately

Answer

Multiplace chambers are pressurized with air; patients receive therapeutic O2 via a tight-fitting mask, hood, or endotracheal tube.

(CHT) Certified Hyperbaric Technician Practice Test