Certified Hyperbaric Technologist Test CHT Hyperbaric Contraindications and Complications 2

Question 1

A patient experiences a tonic-clonic seizure at 2.4 ATA during HBO. The immediate action is to:

Accepted Answer

Remove the oxygen mask and protect the airway

Answer

Immediately decompress the chamber

Answer

Administer anticonvulsants through the chamber port

Answer

Increase pressure to abort the seizure

Question 2

Sinus squeeze (sinus barotrauma) is best prevented by:

Accepted Answer

Ensuring the patient is free of upper respiratory congestion before treatment

Answer

Compressing more rapidly to reduce exposure time

Answer

Having the patient hold their breath during descent

Answer

Administering supplemental nitrogen

Question 3

Visual changes (myopia) experienced by patients after multiple HBO treatments are:

Accepted Answer

Usually reversible within weeks to months after completing therapy

Answer

Permanent and require corrective lens prescription

Answer

A sign of immediate CNS oxygen toxicity

Answer

Caused by retinal barotrauma

Question 4

Which relative contraindication requires special precaution because trapped gas may expand on ascent?

Accepted Answer

History of thoracic surgery with blebs or bullae

Answer

Well-controlled type 2 diabetes

Answer

Stable angina on medication

Answer

History of closed head injury over 1 year ago

Question 5

Confinement anxiety (claustrophobia) in a hyperbaric patient is classified as:

Accepted Answer

A relative contraindication that can often be managed with anxiolytics

Answer

An absolute contraindication requiring treatment refusal

Answer

A physiological complication requiring decompression

Answer

A contraindication only in monoplace chambers

Question 6

Nitrogen narcosis is NOT a concern in HBO therapy primarily because:

Accepted Answer

Patients breathe 100% oxygen, eliminating nitrogen narcosis risk

Answer

Treatment pressures never exceed 1.5 ATA

Answer

Nitrogen is added to prevent narcosis

Answer

Patients are premedicated against narcosis