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Hyperbaric Medicine Fundamentals Flashcards

7 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. According to Charles's Law, if a gas is heated at constant pressure, its volume will:

    Answer: Increase proportionally

    Charles's Law states volume is directly proportional to absolute temperature at constant pressure (V ∝ T).

  2. Which condition is an ABSOLUTE contraindication to hyperbaric oxygen therapy?

    Answer: Untreated pneumothorax

    An untreated pneumothorax can tension under pressure and is the only universally accepted absolute contraindication to HBO.

  3. The US Navy Treatment Table 6 is the standard protocol for which condition?

    Answer: Arterial gas embolism

    USN Table 6 reaches 2.8 ATA and is the primary treatment for arterial gas embolism and serious decompression sickness.

  4. What is the primary role of a 'air break' during an HBO session?

    Answer: Reduce pulmonary and CNS oxygen toxicity risk

    Air breaks (5 min of air breathing) lower cumulative oxygen dose and reduce the risk of both CNS and pulmonary O2 toxicity.

  5. A monoplace hyperbaric chamber is pressurized with which gas?

    Answer: 100% oxygen

    Monoplace chambers are pressurized with 100% oxygen, so the patient breathes the ambient chamber gas directly.

  6. Which sign or symptom should prompt an immediate chamber stop and assessment for CNS oxygen toxicity?

    Answer: Muscle twitching or lip tingling (VENTID symptoms)

    VENTID (Visual, Ears, Nausea, Twitching, Irritability, Dizziness) symptoms are early warning signs of CNS O2 toxicity requiring treatment pause.

  7. Fick's Law of Diffusion states that gas transfer across a membrane is increased by which factor?

    Answer: Higher partial pressure gradient

    Fick's Law: diffusion rate is directly proportional to the pressure gradient, surface area, and solubility, and inversely proportional to membrane thickness.