CHS Oxygen Toxicity & Barotrauma Management 3

Question 1

The Unit Pulmonary Toxicity Dose (UPTD) is used in HBO therapy to track:

Accepted Answer

Cumulative pulmonary oxygen exposure to prevent pulmonary toxicity

Answer

UPTD is a mathematical unit that quantifies cumulative pulmonary oxygen exposure across multiple treatments, helping clinicians schedule safe HBO therapy and prevent pulmonary oxygen toxicity.

Question 2

What is the most dangerous manifestation of CNS oxygen toxicity for a patient inside a hyperbaric chamber?

Accepted Answer

Grand mal (tonic-clonic) seizure

Answer

A grand mal seizure is the most dangerous CNS oxygen toxicity outcome because it can cause physical injury in the confined chamber space and aspiration if the patient loses airway control while masked.

Question 3

A multiplace chamber patient begins having a tonic-clonic seizure. The correct immediate sequence is:

Accepted Answer

Remove oxygen mask, protect patient from injury, then decompress the chamber safely

Answer

Removing the oxygen mask interrupts the CNS oxygen toxicity trigger; protecting the patient from injury addresses immediate safety; safe decompression follows once the seizure is controlled.

Question 4

Why does hypercapnia increase the risk of CNS oxygen toxicity during HBO therapy?

Accepted Answer

Cerebral vasodilation from CO2 increases brain oxygen delivery, lowering the seizure threshold

Answer

Elevated CO2 causes cerebral vasodilation, which increases cerebral blood flow and oxygen delivery to brain tissue, lowering the threshold for CNS oxygen toxicity seizures.

Question 5

Inner ear barotrauma during HBO therapy may result in:

Accepted Answer

Permanent sensorineural hearing loss from round or oval window rupture

Answer

Inner ear barotrauma can rupture the round or oval window membranes, causing permanent sensorineural hearing loss and vestibular dysfunction that may not resolve.

(CHS) Certified Hyperbaric Specialist Practice Test

(CHS) Certified Hyperbaric Specialist Practice Test

CHS Oxygen Toxicity & Barotrauma Management 3