# CCP review FLT PHY

 Barotitis occurs on descent 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. 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. Charles Law Assuming constant pressure, temperature will affect the volume of a gas.Heat expandcool contract Dalton's Law Total pressure of a gas mixture is the total of the pressures of each type of gas in the mixture. 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... 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) A sinus infection may cause pain on: Ascent: Trapped gases expand on ascent and can not escape causing pain/pressure At 760 torr 50% FiO2 would be____mm Hg 380 mmHg P torr X gas concentration = Partial Pressure MSL Altitude above sea level AGL Altitude above the ground ELT stands for: Frequency: 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 greater changes in atmospheric pressure occur nearest The Poles Anticipated Temperature change for each 100 meters of ascent Decrease 1 degree C Physiologic Zone 0 to 10,000' MSL Most humans can function normalls Physilogic Deficient Zone 10,000 to 50,000' Supportive or protective suppliments needed to survive -Causes hypoxic hypoxia 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. 1 ATM in torr 760 torr Explosive Decompression Decompression that occurs in < 0.1 second. Hypoxic Hypoxia This is a lack of oxygen as a result of a high altitude (decreased oxygen pressure) 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 Histotoxic Hypoxia This form results from tissue poisoning such as from alcohol, narcotics, and certain poisons Hypermic Hypoxia Inability to carry adequate oxygen. (low H & H). Effects greatly affected by decreased atomspheric partial pressures (altitude) 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 Indifferent Stage The only adverse effect is on dark adaptation (Night vision) Compensatory Stage Physiological compensations provide some defense against hypoxia Disturbance Stage physiological compensations do not provide adequate oxygen for the tissuesSymptoms 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. . Critical Stage In the critical stage consciousness is lost. Death follows shortly 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 Attitude that affects nights vision in healthy person 5,000' AGL Night Vision in the eye rods in periphery of the retina Shut down procedure post crash Throttle,fuel,Battery, rotor brake,oxygen Stressors of Flight D rugsE xhaustionA lcoholT obaccoH ypoglycemia Sterile Cockpit Maintained during all critical phases of flight AuthorDavid659 ID153100 Card SetCCP review FLT PHY DescriptionReview of critical paramedic topics Updated2013-02-17T22:38:31Z Show Answers