CCP review FLT PHY

  1. Barotitis occurs
    on descent
  2. Graham's Law
    • Graham found that the rates at which gases diffuse is inversely proportional to the square root of their densities.
    • The heavier the weight (Molar Mass) the slower the gas diffuses.
    • (Inhaling Heium, a light gas, moves faster than room air making the voice higher in pitch. A heavier gas would make the voice lower.
  3. Henry's Law
    • The amount of a gas dissolved at equilibrium in a given quantity of a liquid is proportional to the pressure of the gas in contact with the liquid
    • Opening a can of soda= when opened pressure equalizes with the atmosphere. Pressure becomes less than gas disolved and gas is released.
    • In transport think the bends, also Nitrogen release from fat tissues during ascent.
  4. Charles Law
    • Assuming constant pressure, temperature will affect the volume of a gas.
    • Heat expand
    • cool contract
  5. Dalton's Law
    Total pressure of a gas mixture is the total of the pressures of each type of gas in the mixture.
  6. Boyle's Law
    at constant temperature for a fixed mass, the absolute pressure and the volume of a gas are inversely proportional

    • P1V1 = P2V2
    •  Think of a hellium balloon. If you release it at sea level it as a certain shape. As it rises the outside pressure becomes less, and the balloon expands.....The higher you go the more trapped gas tires to expand. Think about sinuses, a chest tube should bubble more on ascent, etc...
  7. Gay-Lussac's Law
    • Key Points:Volume and moles of gas are constant
    • Pressure and temperature are directly proportional to each other

    Application: Heating an oxygen cylinder will increase pressure (Closed system)
  8. A sinus infection may cause pain on:
    Ascent: Trapped gases expand on ascent and can not escape causing pain/pressure
  9. At 760 torr 50% FiO2 would be____mm Hg
    380 mmHg

    P torr X gas concentration = Partial Pressure
  10. MSL
    Altitude above sea level
  11. AGL
    Altitude above the ground
  12. ELT stands for:
    Typical G forces to trigger
    Emergency Locator Transmitter

    • 121.5 Civil
    • 243 Military
    • New Sat system: 406 Hz

    4 G impact to device to trigger
  13. greater changes in atmospheric pressure occur nearest
    The Poles
  14. Anticipated Temperature change for each 100 meters of ascent
    Decrease 1 degree C
  15. Physiologic Zone
    • 0 to 10,000' MSL
    • Most humans can function normalls
  16. Physilogic Deficient Zone
    • 10,000 to 50,000'
    • Supportive or protective suppliments needed to survive
    • -Causes hypoxic hypoxia
  17. ATM
    The weight of air in a 1" coloum that goes from sea level to top of atmospere at 59 degrees F.. 14.7 lbs = 760 torr.
  18. 1 ATM in torr
    760 torr
  19. Explosive Decompression
    Decompression that occurs in < 0.1 second.
  20. Hypoxic Hypoxia
    This is a lack of oxygen as a result of a high altitude (decreased oxygen pressure)
  21. Stagnant Hypoxia
    malfunction of the circulatory system resulting in a decrease in blood flow. Causes include high g-loading, exposure to extreme hot or cold temperatures, or by shock
  22. Histotoxic Hypoxia
    This form results from tissue poisoning such as from alcohol, narcotics, and certain poisons
  23. Hypermic Hypoxia
    Inability to carry adequate oxygen. (low H & H). Effects greatly affected by decreased atomspheric partial pressures (altitude)
  24. Time of useful conciousness
    • amount of time an individual is able to perform flying duties efficiently in an environment of inadequate oxygen supply
    • FL 150 30 min or more
    • FL180 20 to 30 min
    • FL 250 3 to 6 min,
    • FL 2802.5 to 3 mins
    • FL 3001 to 3 mins
    • FL 350 30 sec to 60 sec
    • FL 400 15 to 20 sec
    • FL 430 9 to 15 sec
    • FL 500 and above 6 to 9 sec
  25. Indifferent Stage
    The only adverse effect is on dark adaptation (Night vision)
  26. Compensatory Stage
    Physiological compensations provide some defense against hypoxia
  27. Disturbance Stage
    • physiological compensations do not provide adequate oxygen for the tissues
    • Symptoms may include fatigue, lassitude,somnolence , dizziness, headache, breathlessness, and euphoria. Both the peripheral and central vision are impaired and visual acuity is diminished. Extraocular muscles are weak and incoordinate– Touch and pain are diminished or lost. Hearing is one of the last senses to be impaired or lost. Intellectual impairment is an early sign Thinking is slow. Calculations are unreliable. .
  28. Critical Stage
    In the critical stage consciousness is lost. Death follows shortly
  29. Calculation for FiO2 with pressure changes
    • P1 (Bara 1) X FiO2/ P2 (Bara2)= FiO2
    • Starting 700 torr x 0.25O2 /destination 650 torr=0.27 FiO2
  30. Attitude that affects nights vision in healthy person
    5,000' AGL
  31. Night Vision in the eye
    rods in periphery of the retina
  32. Shut down procedure post crash
    Throttle,fuel,Battery, rotor brake,oxygen
  33. Stressors of Flight
    • D rugs
    • E xhaustion
    • A lcohol
    • T obacco
    • H ypoglycemia
  34. Sterile Cockpit
    Maintained during all critical phases of flight
Card Set
CCP review FLT PHY
Review of critical paramedic topics