CHT Cheat Sheet 2026

The 30 highest-yield CHT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the generally accepted maximum oxygen partial pressure (PO2) to minimize risk of CNS oxygen toxicity during routine HBO treatments? → 1.6 ATA (1,216 mmHg)
2. Charles's Law describes the relationship between gas volume and: → Temperature at constant pressure
3. What documentation is required when equipment is replaced or upgraded? → Asset tracking records, disposal documentation, and updated operating procedures
4. When should a practitioner modify their assessment approach? → When the patient presents with contraindications or special needs
5. Why is communication equipment essential in multi-place chambers? → To allow communication between staff and patients
6. What is the primary purpose of maintaining accurate professional documentation? → To create a legal record of services and support continuity of care
7. How often should infection control training be updated? → Annually or per facility requirement
8. At 3 ATA breathing 100% O2, approximately how much oxygen is dissolved in plasma? → 6.6 mL O2/100 mL blood
9. What is the primary function of hyperbaric oxygen therapy (HBOT)? → Enhance tissue oxygenation and healing
10. Which of the following is the hallmark presentation of CNS oxygen toxicity during HBO therapy? → Grand mal (tonic-clonic) convulsions
11. Which tool is used to monitor oxygen saturation in HBOT patients? → Pulse oximeter
12. One atmosphere absolute (1 ATA) is equivalent to approximately: → 14.7 psi
13. What is the primary objective of hyperbaric chamber emergency procedures in Certified Hyperbaric Technician practice? → Ensuring consistent quality and adherence to professional standards
14. Which condition is an approved indication for HBOT? → Carbon monoxide poisoning
15. Which chemotherapeutic agent is considered a major contraindication to HBO therapy due to significantly increased pulmonary toxicity risk? → Bleomycin
16. What is the primary purpose of regulatory standards in hyperbaric medicine? → To ensure safety and quality of care
17. Which competency is most essential for professionals working in hyperbaric chamber emergency procedures? → Comprehensive knowledge combined with practical application skills
18. What should a technician do if a patient reports ear pain during compression? → Pause compression and assist the patient in equalizing pressure
19. What must be completed before using any specialized equipment? → Verify proper calibration and review safety procedures
20. Why is knowledge of the circulatory system important for practitioners? → It helps identify contraindications and understand treatment effects on blood flow
21. An HBO patient inside a monoplace chamber suddenly develops facial twitching and lip tremors. The technician's FIRST action should be: → Switch the patient to air breathing and prepare to decompress the chamber
22. How can technicians support anxious patients in the chamber? → Explain the process, offer reassurance, and use calming techniques
23. How should reusable equipment be disinfected? → Using EPA-registered disinfectants per protocol
24. Why is continuous patient monitoring essential during HBOT? → To detect and respond to complications promptly
25. What is the correct response to suspected equipment malfunction? → Remove from service immediately, tag as defective, and report to maintenance
26. Which standard must hyperbaric facilities follow for safety compliance? → NFPA 99
27. The earliest measurable pulmonary function change indicating early pulmonary oxygen toxicity is: → Decrease in forced vital capacity (FVC)
28. The Marx protocol for mandibular osteoradionecrosis (ORN) calls for: → 20 pre-operative and 20 post-operative HBOT sessions at 2.4 ATA
29. What is a common sign of equipment contamination? → Visible residue or foul odor
30. Which of the following is recognized as a RELATIVE contraindication (not absolute) to HBO therapy? → History of prior spontaneous pneumothorax (now resolved)