Physiological Events

Question 1

Difference between classic hornet and super hornet

Answer 1

Super hornet = OBOGS

Classic hornet = liquid oxygen LDBO

Question 2

Percentage of oxygen from OBOGS

Answer 2

93-95%

Question 3

What are symptoms Physiology events

Answer 3

Hypoxia
Cognitive impairment felt slow
Task fixation
Working hard
Minor flight path deviations corrected by wingman and ATC
Headache
SOB
Reduced exercise tolerance 
Cough
Fatigued

Question 4

Proposed Mechanisms of PE

Answer 4

Multi factorial
1- O2 related and acceleration atelectasis most supported current
2 - hypocapnia due to hyperventilation (due to stress)

Others

• hypoxia
• hyperoxia
• hypocapnia
• WOB
• BAS flow and resistance
• DCS
• Contammination
• thermal stress/dehydration
• Psychophysiological response

Question 5

Cause atelectasis, symptoms

Answer 5

Can occur <60% oxygen

Pathology: physiological significant hypoventilation and shunt of pulmonary circulation, resulting in a reduction of hypoxia tolerance

Symptoms can persistent for 24 hours

Question 6

Hypocapnia in aviation

Answer 6

Causes

• hypoxaemia
• arousal/anxiety

Alteration of respiratory cycle
Combined with environmental stress

Aircraft factors
- Altitude, speed, air density, humidity, heat load, supply pressure, OBOGS cycling, Plenum volume, regulator characteristics.

ALSE

• Pilot- interface factors
• mask seal
• fit
• restriction to flow
• constriction
• respiratory patterns - rate, volume and sensation
• individual variability

Question 7

Aircrew controlled-breathing cycle

Answer 7

Breath in 
- take deliberate deep inhalation over approximately 5 seconds
Hold 5 seconds
Breath out over 5 
Rest - 5 normal breathes
Repeat - up to 5 times
Cough

Question 8

When should pilots conduct ACBC

Answer 8

Pre- G
Post - G
Post - flight
Transit - every hour duration long transits
As required 
PE recovery action

Question 9

Initial response to PE

Answer 9

Initially based f clinical situation
Vitals as soon as practical
If available include Rad - 57 CO-Hb

If asymptomatic

• observe for a 20mins
• take detailed history
• Document - USN Part C, PM220, DeHS
• Aircrew sentinel report, ASOR, physiological incident form Part 1, B

If symptomatic

• Apply 100% oxygen via NRB mask for 20mins
• Clinical mx IAW ARC guidelines
• Facilitate pt transfer if required
• Avoid hyperventilation and encourage lung inflation

Question 10

IX for PE

Answer 10

CO-Hb
Routine bloods
Toxicology screen: ethanol, urine drug screen, hydrogen cyanidee, a role in, hydrocarbons
CXR: only if indicated

Question 11

Documents for PE

Answer 11

IAM HPAC PE form PM220
USN physiological Event part C
Document in DeHS