60 driver

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60driver
ID:
85424
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60 driver
Updated:
2011-05-12 10:35:37
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Aviation
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Aeromed
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  1. WHAT IS HYPOXIA?
    The result of a lack of Oxygen in the body. This is caused by flight at high altitudes, smoking, and other factors. There are 4 types or conditions of Hypoxia.
  2. What are 4 types or conditions of Hypoxia?
    Hypoxic, Hypemic, Histotoxic, Stagnant
  3. What are the defintions of the 4 types of Hypoxia?
    • HYPOXIC- Results from an INSUFFICIENT amount of oxygen in the air.
    • HYPEMIC- Reduction in the OXYGEN CARRYING CAPACITY of the blood. Examples are; Anemia, Blood Loss, Carbon Monoxide (smoking), nitrates, Sulfa Drugs.
    • HISTOTOXIC- Results from INTERFERENCE with the use of oxygen by the body. Examples are; Alcohol, Narcotics, & poisons.
    • STAGNANT- Results from INADEQUATE CIRCULATION of blood, which for aviators is common in G Forces. Other examples are; Heart Failure, Arterial Spasms, Vessel Occlusions.
  4. PHYSIOLOGICAL ALTITUDES OF HYPOXIA
    The altitude that the body feels due to stressors applied to it. The 2 types of stressors that cause a physiological altitude are smoking and alcohol.
  5. PHYSIOLOGICAL STRESSORS
    • SMOKING- Smoking 3 cigarettes in rapid succession or 20 – 30 (pack – pack ½) in 24 hours can saturate 8-10% of the Hemoglobin in blood reducing oxygen carrying capacity (Hypemic) resulting in;
    • * Loss of 20% of night vision at sea-level
    • * Physiological altitude of 5,000’ at sea-level
    • The results of this Physiological Altitude would mean that at an aircraft altitude of 5,000’ - 6,000’ (common under IFR), where the rest of the crew were in the Indifferent Stage, a smoker under the conditions above would be in the Compensatory Stage.
    • ALCOHOL- 1 ounce (shot) of alcohol creates Histotoxic Hypoxia and a resulting Physiological Altitude of 2,000’ at sea-level.
  6. Four stages of Hypoxia
    • Indifferent-
    • 0 – 10,000’

    • Compensatory
    • 10,000 – 15,000’

    • Disturbance-
    • 15,000 – 20,000’

    • Critical-
    • 20,000 – 25,000’
  7. Symptoms of 4 stages of Hypoxia
    • INDIFFERENT- Decrease in Night Vision.
    • (Normal operating environment for Rotary Wing)

    COMPENSATORY- Drowsiness, Poor Judgment, Impaired Coordination, Impaired Efficiency.

    • DISTURBANCE-
    • IMPAIRED FUNCTIONS: Flight Control, Handwriting, Speech, Vision, Intellectual Function, Judgment.
    • DECREASED FUNCTIONS: Coordination, Pain Sensation, Memory.

    CRITICAL- Circulatory Failure, CNS Failure, Convulsions, Cardiovascular Collapse, DEATH.

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