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CHT Physics & Gas Laws in Hyperbaric Medicine Flashcards

6 cards from real CHT 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. Fick's Law of Diffusion states that the rate of diffusion increases with:

    Answer: Increasing surface area and concentration gradient

    Fick's Law states diffusion rate is proportional to surface area and concentration gradient, and inversely proportional to membrane thickness.

  2. At 3 ATA breathing 100% O2, approximately how much oxygen is dissolved in plasma?

    Answer: 6.6 mL O2/100 mL blood

    At 3 ATA with 100% O2, PO2 ≈ 2280 mmHg; using the solubility coefficient of 0.003 mL/100 mL/mmHg, dissolved O2 ≈ 6.6 mL/100 mL — enough to sustain resting tissues without hemoglobin.

  3. Nitrogen narcosis while breathing air in a hyperbaric environment typically becomes clinically apparent around:

    Answer: 4.0 ATA

    Nitrogen narcosis generally becomes clinically apparent around 4 ATA (approximately 99 fsw) when breathing air, though individual susceptibility varies.

  4. What is the primary reason 100% oxygen is used instead of air during hyperbaric therapy?

    Answer: 100% O2 maximizes dissolved oxygen in tissues via Henry's Law for therapeutic effect

    Breathing 100% O2 maximizes the partial pressure of oxygen, driving dissolution into plasma and ischemic tissues via Henry's Law to deliver the therapeutic hyperoxic dose.

  5. A gas bubble measuring 1 cm³ at 1 ATA will measure approximately what volume at 3 ATA (Boyle's Law)?

    Answer: 0.33 cm³

    Applying Boyle's Law (P₁V₁ = P₂V₂): 1 × 1 = 3 × V₂, giving V₂ = 0.33 cm³.

  6. A patient treated for decompression illness benefits from recompression primarily because:

    Answer: Boyle's Law physically reduces bubble size, restoring blood flow to ischemic tissue

    Recompression applies Boyle's Law to physically shrink intravascular and tissue gas bubbles, restoring perfusion and reducing ischemic injury caused by decompression illness.