Practice Test Geeks(CHS) Certified Hyperbaric Specialist Practice Test
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Hyperbaric Medicine Principles & Physiology Flashcards

7 cards from real CHS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to Henry's Law, what happens to the amount of gas dissolved in a liquid when pressure is doubled?

    Answer: The dissolved gas amount doubles

    Henry's Law states that the amount of gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid.

  2. At 2.0 ATA, a patient breathes 100% oxygen. What is the approximate partial pressure of oxygen (PO2)?

    Answer: 2.0 ATA

    Breathing 100% oxygen at 2.0 ATA yields a PO2 of 2.0 ATA (2.0 × 1.0 = 2.0 ATA).

  3. Which physiological mechanism primarily accounts for the anti-ischemic benefit of hyperbaric oxygen in crush injuries?

    Answer: Reduction of compartment syndrome edema via vasoconstriction

    HBO2-induced vasoconstriction reduces edema in injured compartments while still delivering elevated dissolved oxygen to hypoxic tissues.

  4. The Krogh cylinder model of oxygen transport describes which physiological concept?

    Answer: Diffusion of oxygen from a capillary to surrounding tissue over a finite radius

    The Krogh cylinder model illustrates how oxygen diffuses radially from a capillary into a surrounding cylinder of tissue, defining the critical tissue radius.

  5. What is the term for the pressure at which nitrogen narcosis first becomes noticeable in most divers breathing air?

    Answer: 3.0 ATA

    Nitrogen narcosis typically begins to impair cognitive function at approximately 3.0 ATA (equivalent to about 66 feet of seawater) when breathing compressed air.

  6. In hyperbaric oxygen therapy, which pulmonary complication results from prolonged high-dose oxygen exposure and is characterized by progressive alveolar damage?

    Answer: Oxygen-induced pulmonary toxicity (Lorrain Smith effect)

    The Lorrain Smith effect describes pulmonary oxygen toxicity caused by prolonged high partial pressures of oxygen, leading to inflammation and alveolar damage.

  7. Which formula correctly expresses absolute pressure (ATA) for a diver at depth D in feet of seawater?

    Answer: ATA = 1 + (D / 33)

    Absolute pressure in ATA equals 1 (surface atmospheric pressure) plus the gauge pressure, where each 33 feet of seawater adds 1 ATA.