Certified Hyperbaric Technologist Test CHT Hyperbaric Medicine and Indications 4

Question 1

Dalton's law of partial pressures is most relevant to hyperbaric medicine because it explains:

Accepted Answer

How each gas in a mixture contributes its own partial pressure

Answer

Why bubbles shrink under pressure

Answer

How temperature affects gas volume

Answer

How light bends through chamber windows

Question 2

Henry's law is the principle behind which therapeutic effect of HBO?

Accepted Answer

Increased oxygen dissolved directly into the blood plasma

Answer

Mechanical compression of gas bubbles

Answer

Conduction of heat in the chamber

Answer

Refraction of sound under pressure

Question 3

At 3 ATA breathing 100% oxygen, dissolved plasma oxygen rises enough to meet resting tissue needs even without hemoglobin. This principle supports treating:

Accepted Answer

Severe anemia where blood transfusion is not possible

Answer

Routine viral infections

Answer

Simple lacerations

Answer

Seasonal allergies

Question 4

The standard HBO treatment pressure for most chronic wound and radiation injury protocols is approximately:

Accepted Answer

2.0 to 2.5 ATA

Answer

1.1 ATA

Answer

5.0 ATA

Answer

7.0 ATA

Question 5

Air breaks (periods of breathing room air) are scheduled during HBO sessions primarily to:

Accepted Answer

Reduce the risk of oxygen toxicity

Answer

Cool the chamber temperature

Answer

Allow the patient to eat

Answer

Recharge the chamber compressor

Question 6

Idiopathic sudden sensorineural hearing loss is included as an HBO indication because the inner ear:

Accepted Answer

Has high metabolic oxygen demand and benefits from elevated oxygen delivery

Answer

Is filled with air that compresses

Answer

Produces its own carbon dioxide

Answer

Cannot equalize pressure at all

Question 7

Compromised skin grafts and flaps are treated with HBO mainly to:

Accepted Answer

Enhance oxygen delivery to ischemic tissue and improve graft survival

Answer

Sterilize the operating room

Answer

Replace the need for sutures

Answer

Lower the patient's blood pressure