Certified Hyperbaric Technologist Test Hyperbaric Wound Healing 2

Question 1

Which physiologic mechanism most directly explains how HBO2 therapy improves healing in a hypoxic wound?

Accepted Answer

Increased dissolved oxygen in plasma driving diffusion into ischemic tissue

Answer

Reduced systemic blood pressure

Answer

Direct antibiotic delivery to bacteria

Answer

Stimulation of red blood cell agglutination

Question 2

A diabetic foot ulcer classified as Wagner grade 3 with osteomyelitis is generally considered:

Accepted Answer

An approved indication for adjunctive HBO2 therapy

Answer

An absolute contraindication

Answer

Unaffected by oxygen tension

Answer

Treatable only with topical oxygen

Question 3

Hyperoxia during HBO2 promotes wound healing partly by stimulating which process essential for new tissue?

Accepted Answer

Angiogenesis and fibroblast collagen synthesis

Answer

Lymphatic drainage shutdown

Answer

Permanent vasodilation

Answer

Inhibition of growth factors

Question 4

Which assessment best predicts whether a wound is likely to respond to HBO2 therapy?

Accepted Answer

Transcutaneous oximetry (TcPO2) measurements

Answer

Resting heart rate

Answer

Patient body weight

Answer

Ambient room temperature

Question 5

Why does HBO2 enhance leukocyte killing of bacteria in an infected wound?

Accepted Answer

Oxygen-dependent respiratory burst requires adequate tissue O2

Answer

It cools the tissue to slow bacteria

Answer

It removes all moisture from the wound

Answer

It blocks white cell migration

Question 6

A typical HBO2 wound-healing treatment protocol commonly uses pressures in the range of:

Accepted Answer

2.0 to 2.5 ATA for about 90 to 120 minutes

Answer

1.1 ATA for 10 minutes

Answer

4.0 ATA for 5 minutes

Answer

Surface pressure with supplemental nasal cannula

Question 7

Which of the following is the strongest relative contraindication a technologist must screen for before wound HBO2?

Accepted Answer

Untreated pneumothorax

Answer

Well-controlled hypertension

Answer

Mild seasonal allergies

Answer

History of a healed fracture