Certified Hyperbaric Technologist Test CHT Decompression Sickness and Gas Embolism Treatment 2

Question 1

USN Treatment Table 5 is used for:

Accepted Answer

Mild DCS (Type I) with complete relief within 10 minutes at 60 fsw

Answer

All neurological DCS cases

Answer

AGE when Table 6 is unavailable

Answer

CO poisoning with mild symptoms

Question 2

In a multiplace chamber treating DCS, the inside tender breathes air while the patient breathes 100% oxygen at 60 fsw. The tender must be aware of:

Accepted Answer

Their own decompression obligation acquired from the air exposure at 2.8 ATA

Answer

Oxygen toxicity from ambient chamber oxygen

Answer

Risk of CO poisoning from the chamber hull off-gassing

Answer

Nitrogen narcosis incapacitating them at this shallow depth

Question 3

Recompression therapy for AGE is most effective when initiated:

Accepted Answer

As quickly as possible, ideally within hours of symptom onset

Answer

Only after complete neurological assessment over 24 hours

Answer

After MRI confirmation of cerebral emboli

Answer

Once the patient is stabilized in the ICU for 48 hours

Question 4

The 'bend' (limb-bend) in DCS most commonly affects which joint?

Accepted Answer

The shoulder and elbow in divers

Answer

The knee only in all DCS cases

Answer

The hip in flying DCS only

Answer

The wrist in all recreational dive DCS

Question 5

What is 'flying DCS' (altitude DCS)?

Accepted Answer

DCS triggered by reduced atmospheric pressure during air travel after diving

Answer

DCS caused by breathing pressurized cabin air at altitude

Answer

Any DCS occurring aboard a pressurized aircraft

Answer

DCS limited to military aviators flying combat missions

Question 6

Hydration is recommended as an adjunct in DCS treatment primarily because:

Accepted Answer

It reduces blood viscosity and supports tissue perfusion impaired by gas bubbles

Answer

It dilutes dissolved nitrogen in the bloodstream directly

Answer

It counteracts oxygen toxicity at cellular level

Answer

It prevents post-recompression seizures