Quiz-449-Decompression Events

Which type of decompression is defined as a pressure loss occurring over a period greater than 10 seconds and is often insidious, mimicking fatigue or intoxication?

Classification of decompression events

Explosive decompression

Rapid decompression

Slow (gradual) decompression

Controlled decompression

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During a decompression event at 35,000 ft, what is the absolute first action a medical crew member must take?

Immediate priority during decompression

Secure the patient's airway and apply a non-rebreather mask

Don their own supplemental oxygen mask immediately

Check the patient's endotracheal tube cuff pressure

Communicate with the flight deck to initiate emergency descent

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Which action significantly increases the risk of pulmonary barotrauma (e.g., pneumothorax or arterial gas embolism) during a rapid decompression event?

Pulmonary barotrauma risk factors

Hyperventilating to increase oxygen intake

Holding one's breath at the moment of pressure loss

Administering 100% oxygen prior to the event

Performing a Valsalva manoeuvre to equalise ear pressure

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What is the target altitude for an emergency descent following a decompression event to ensure adequate oxygenation without supplemental oxygen for healthy individuals?

Target descent altitude

14,000 ft

10,000 ft

8,000 ft

5,000 ft

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Which clinical sign in a patient following a decompression event might indicate the development of decompression sickness (DCS) or gas emboli?

Post-decompression monitoring

Increased appetite and thirst

Skin mottling, marbling, or livedo reticularis

Improved neurological status and pupil reactivity

Decreased heart rate and blood pressure

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At approximately what altitude does the phenomenon of ebullism (vaporisation of body fluids) begin, known as the Armstrong Limit?

Armstrong Limit

18,000 ft

35,000 ft

40,000 ft

63,000 ft

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A flight medic experiences joint pain and visual disturbances after a decompression event at 28,000 ft. What is the appropriate immediate action?

Crew self-assessment and reporting

Continue the mission and document the symptoms in the patient care report

Self-assess for DCS, cease duty, and seek evaluation at a hyperbaric medicine facility

Administer aspirin and monitor the symptoms for 24 hours

Return to the flight deck to assist the pilot as the symptoms are likely fatigue

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