CHT CHT Wound Care & Hyperbaric Indications

Question 1

Which diabetic foot wound classification qualifies for HBOT under UHMS-approved indications?

Accepted Answer

Wagner Grade III or higher wound with demonstrated tissue hypoxia

Answer

UHMS approves HBOT for Wagner Grade III or higher diabetic foot wounds with documented tissue hypoxia that has not responded to standard wound care.

Question 2

A transcutaneous oxygen measurement (TCOM/TcPO2) below what value indicates severe tissue hypoxia and poor healing potential?

Accepted Answer

25 mmHg

Answer

A periwound TCOM below 25 mmHg indicates severe tissue hypoxia and predicts poor wound healing without an oxygen-enhancing intervention such as HBOT.

Question 3

HBOT promotes wound healing primarily by:

Accepted Answer

Raising tissue oxygen tension to stimulate angiogenesis, fibroblast activity, and collagen synthesis

Answer

HBOT elevates tissue PO2, which stimulates fibroblast proliferation, collagen deposition, and VEGF-driven angiogenesis — all critical steps in wound healing.

Question 4

Carbon monoxide poisoning is treated with HBOT because:

Accepted Answer

Oxygen at high partial pressure competitively displaces CO from hemoglobin, reducing carboxyhemoglobin half-life from ~5 hours to ~20 minutes

Answer

At 2.4–3 ATA, high PO2 competitively displaces CO from hemoglobin and myoglobin, dramatically accelerating CO elimination and reducing delayed neurological injury.

Question 5

Which type of radiation injury is an approved UHMS indication for HBOT?

Accepted Answer

Delayed radiation necrosis of soft tissue and bone (osteoradionecrosis)

Answer

Delayed radiation necrosis (soft tissue radionecrosis and osteoradionecrosis) is UHMS-approved because radiation causes progressive vascular obliteration leading to chronic tissue hypoxia.

(CHT) Certified Hyperbaric Technician Practice Test

(CHT) Certified Hyperbaric Technician Practice Test

CHT CHT Wound Care & Hyperbaric Indications