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

Type 2 diabetes mellitus

Answer

Mild anemia (Hgb 10 g/dL)

Answer

Controlled asthma on inhaled bronchodilators

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 time frame when O2 toxicity is most likely

Answer

The chamber viewport used to monitor oxygen purity

Answer

The gap between two air break periods

Question 3

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

Accepted Answer

33 FSW

Answer

10 FSW

Answer

66 FSW

Answer

100 FSW

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

HBO increases hemoglobin synthesis in bone marrow

Answer

HBO converts methemoglobin back to functional hemoglobin

Answer

HBO increases erythrocyte deformability to improve capillary flow

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

Air is more flammable than oxygen at high pressure

Answer

The chamber uses helium as a pressurizing gas

Answer

Mask delivery allows higher pressure than ambient chamber pressure

Question 6

Which long-term complication can develop in patients receiving extensive courses of HBO therapy affecting the lungs?

Accepted Answer

Pulmonary oxygen toxicity (Lorrain Smith effect) with decreased vital capacity

Answer

Pulmonary fibrosis

Answer

Spontaneous pneumothorax

Answer

Chronic obstructive pulmonary disease

Question 7

Which patient presentation is the best indicator that a hyperbaric wound-healing treatment course is producing clinical benefit?

Accepted Answer

Measurable reduction in wound size and improved transcutaneous oxygen tension (TcPO2)

Answer

Subjective report of reduced pain only

Answer

Complete absence of infection signs after one treatment

Answer

Normalization of serum glucose in diabetic patients