Physiological Events Flashcards

1
Q

Difference between classic hornet and super hornet

A

Super hornet = OBOGS

Classic hornet = liquid oxygen LDBO

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2
Q

Percentage of oxygen from OBOGS

A

93-95%

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3
Q

What are symptoms Physiology events

A
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
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4
Q

Proposed Mechanisms of PE

A

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
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5
Q

Cause atelectasis, symptoms

A

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

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6
Q

Hypocapnia in aviation

A

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
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7
Q

Aircrew controlled-breathing cycle

A
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
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8
Q

When should pilots conduct ACBC

A
Pre- G
Post - G
Post - flight
Transit - every hour duration long transits
As required 
PE recovery action
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9
Q

Initial response to PE

A

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
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10
Q

IX for PE

A

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

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11
Q

Documents for PE

A

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

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