CHT Study Guide 2026
Everything you need to pass the CHT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CHT Exam Format at a Glance
📚 CHT Topics to Study (69)
✍️ Sample CHT Questions & Answers
1. The Frank-Starling mechanism of the heart states that increased ventricular preload leads to:
The Frank-Starling law describes how greater ventricular filling stretches myocardial fibers, optimizing actin-myosin overlap and increasing the force of contraction and stroke volume.
2. The 'oxygen window' in hyperbaric therapy refers to:
The oxygen window is the pressure differential created when tissues consume oxygen, replacing it with a gas-free space that accelerates nitrogen elimination without bubble formation.
3. What is the maximum allowable oxygen concentration in a multiplace chamber breathing air, per NFPA 99 guidelines?
NFPA 99 sets 23.5% as the oxygen-enriched atmosphere threshold; chamber ambient O2 must be maintained below this level to reduce fire risk.
4. In the mnemonic VENTID-C used to identify early CNS oxygen toxicity symptoms, the 'V' stands for:
In VENTID-C, V stands for Visual disturbances (tunnel vision), which is an early warning sign of CNS oxygen toxicity preceding convulsions.
5. Active seizure disorder is classified as which type of contraindication to HBO therapy?
Active seizure disorder is a relative contraindication; HBO can proceed with physician evaluation, optimized seizure management, and heightened monitoring for oxygen toxicity warning signs.
6. A patient receiving HBO for a non-healing wound reports new chest tightness and shortness of breath after the 30th treatment. This presentation is MOST consistent with:
Chest tightness and dyspnea after many HBO sessions suggests pulmonary oxygen toxicity (Lorraine Smith effect) from cumulative oxygen exposure.