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Types of Hypoxia

Types of Hypoxia. Hypoxic Hypoxia (Altitude Hypoxia). Reduced O 2 in the lungs (high altitude). A deficiency in Alveolar oxygen exchange. Red blood cells. Body tissue. Hypoxic Hypoxia. Most common type of Hypoxia occur in aviation.

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Types of Hypoxia

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  1. Types of Hypoxia

  2. Hypoxic Hypoxia (Altitude Hypoxia) Reduced O2 in the lungs (high altitude) A deficiency in Alveolar oxygen exchange Red blood cells Body tissue

  3. Hypoxic Hypoxia • Most common type of Hypoxia occur in aviation. • Hypoxic hypoxia occurs when not enough oxygen is in the air or when decreasing atmospheric pressures prevent the diffusion of O2 from the lungs to the bloodstream. • This is the type that is most likely to be encountered at altitude. • The partial pressure of oxygen as it is presented to the blood within the lungs is too low to effectively carry and transfer enough oxygen to the cells of the tissues.

  4. Hypoxic Hypoxia • Can be resulted from: • Altitude exposure • Strangulation (compression of air passage cause the respiration arrest) • Other: • Failure of oxygen system in aircraft • Improper use of equipment • Failure of depressurization system

  5. Stagnant Hypoxia • Occurs at circulatory level. • A condition that interferes within the normal circulation of blood arriving at the cells. • An arm or leg going to sleep because the blood flow has accidentally been shut off is one form of stagnant hypoxia.

  6. Stagnant Hypoxia • Can occur as the result of: • G forces from maneuvers (mostly aerobatic aircraft) • Disease of the blood vessels • Cardiac (Heart) Arrest • Shock • Exposure to Cold • Sudden change in posture

  7. Stagnant Hypoxia • The g-force, on something is its acceleration relative to free-fall. • This acceleration experienced by an object is due to the vector sum of non-gravitational forces. • Accelerations not produced by gravity are termed proper accelerations, and cause stresses and strains on objects. Because of these strains, large g-forces may be destructive.

  8. Think out of the box!! What is hemoglobin? Where can we find hemoglobin? What is the function of hemoglobin? What are the risks if the amount of hemoglobin inside our body is low?

  9. Hypemic Hypoxia • Occurs at blood level. • An oxygen deficiencydue to reduction in the oxygen carrying capacity of the blood (Low Hemoglobin)

  10. Hypemic Hypoxia • Caused by: • Anemia (A deficiency of red blood cells) • Bleeding • Taking some prescription drug. • *Blood donation • Other: • Smoking ; • cabin contamination with engine exhaust fume • Carbon Monoxide • interferes with oxygen • binding to the blood

  11. Hypemic Hypoxia • *Blood Donation: • Symptoms of hypoxia at lower altitudes • Most airlines: • No flight for 72 hours after donation of whole blood • No flight for 12 hours after donation of plasma

  12. Histotoxic Hypoxia • Occurs at cell level • Interferes with the normal utilization of oxygen into the cells. • plenty of oxygen is being transported to the cells that need it, but they are unable to make use of it. • Tissue cells are poisoned and unable to use oxygen • Caused by Alcohol and Drug

  13. Why Important to recognize? • If hypoxia is prolonged, serious problems develop with ultimate death. • In extreme cases (prior to death), some brain cells are actually killed, and they cannot be regenerated. • The single most dangerous characteristic of hypoxia is that if the crewmember is hypoxic and engrossed (complete attention) in flight duties, the pilot might not even notice the impairment.

  14. Stage of Hypoxia Indifferent Stage Compensatory stage Disturbance stage Critical Stage

  15. Stage of Hypoxia • INDIFFERENT STAGE • This is the mildest stage of hypoxia. • People are not generally aware of the effects of hypoxia at this stage. • The primary is effect on the eye such as loss of night vision or color vision.

  16. Stage of Hypoxia • COMPENSATORY STAGE • The circulatory system, and to a lesser degree, the respiratory system, provide some defense against hypoxia in this stage. • Symptoms: • poor judgement, • drowsiness(sleepy state) • impaired efficiency. • Pulse rate increases • circulation rate increases

  17. Stage of Hypoxia • DISTURBANCE STAGE • In this stage the physiological compensations do not provide adequate oxygen for the tissues. • Chance of recovery greatly diminished. • Symptoms: impaired in flight control, handwriting, speech, coordination, cyanosis, poor judgments and difficulty with simple tasks • CRITICAL STAGE – • Unconsciousness (e.g: blackout, faint) • In the critical stage consciousness is lost. Death follows shortly.

  18. Sign of Hypoxia • Increase in depth and rate of breathing • Cyanosis (A blurry effect of the skin, most noticeable on the lips and the fingernail) • Delayed in reaction time • Poor Judgment

  19. Symptoms of hypoxia • Air Hunger ( a feeling not enough breathable air) • Feeling of fearful or anxiety (nervousness) • Mental confusion • Fatigue • Nausea (just before vomit) • Headache • Dizziness • Hot and cold flashes • Visual Impairment (colour vision, night vision, blurred)

  20. How to prevent?? • Reduce tolerance to altitude (descends) • Don’t fly to high altitude • By enriching the inspired air with oxygen from an appropriate oxygen system (Oxygen Tank & Mask) • By maintaining a comfortable, safe cabin pressure altitude (Cabin Pressurization)

  21. How to prevent?? • Avoid alcohol and smoking • Healthy Diet • Good physical condition • Lower altitudes • Avoid temperature extremes • Slower Climb rates

  22. Corrective action • Once the symptoms/sign are identified, the corrective action must be taken (based on FAR): • Wear oxygen mask • Turn on Oxygen • Make sure all connection secure • Slow down your breath rate • Descend to altitude where supplementary oxygen no longer required.

  23. Effective Performance Time (EPT) • EPT is the period of time that a pilot has from the time oxygen become less available until the time when he or she loses the ability to recognize and take action • EPT is the time a crewmember has from the interruption of the O2 supply to the time when the ability to take corrective action is lost. What does it mean?

  24. Effective Performance Time (EPT) • If someone goes beyond EPT, then he or she isn’t even aware of the problem and will not take corrective action • The keyword is EFFECTIVE or USEFUL (He or she might be conscious but not making expected useful or effective decision).

  25. Conclusion • The danger of hypoxia is that the pilot is probably unsuspecting that he/she is hypoxic. • The key to flying safe at high altitude is to recognize: • The conditions under which you could be hypoxic. • The physical and mental symptoms that indicate you are hypoxic. • When a crewmate is susceptible to hypoxia in those conditions.

  26. End of Presentation #2 5 Minutes for Q/A session

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