CHT Hyperbaric Medicine Fundamentals 2

Question 1

Which law states that the solubility of a gas in a liquid is proportional to the partial pressure of that gas above the liquid?

Accepted Answer

Henry's Law

Answer

Henry's Law directly governs how increased pressure in an HBO chamber forces more oxygen into plasma and tissue fluids.

Question 2

What is the primary reason 100% oxygen is used instead of compressed air in most hyperbaric treatments?

Accepted Answer

Oxygen maximizes tissue oxygen tension and speeds elimination of inert gas

Answer

Breathing 100% oxygen at pressure dramatically raises tissue PO2 and accelerates washout of inert gases like nitrogen.

Question 3

During a hyperbaric treatment at 2.4 ATA, what is the approximate partial pressure of oxygen when the patient breathes 100% O2?

Accepted Answer

2.4 ATA

Answer

Partial pressure of a pure gas equals the total pressure; at 2.4 ATA breathing 100% O2, PO2 = 2.4 ATA.

Question 4

Which of the following best describes the mechanism by which HBO reduces intracranial pressure in carbon monoxide poisoning?

Accepted Answer

HBO-induced vasoconstriction reduces cerebral edema

Answer

High PO2 causes cerebral vasoconstriction, reducing edema and ICP while still delivering adequate O2 via dissolved plasma oxygen.

Question 5

A patient with decompression sickness develops worsening symptoms during ascent from an HBO treatment. What is the most appropriate immediate action?

Accepted Answer

Return to treatment depth and reassess

Answer

Worsening on ascent (omitted decompression response) requires returning to treatment depth per the applicable US Navy Treatment Table.

(CHT) Certified Hyperbaric Technician Practice Test