Flight Medic

When T is constant the V is inversely proportional to the P

• When P is constant the V is proportional to the T
• -Test Tip: Charles -> Centigrade

When V is constant the P is proportional to T

The total P of a gas mixture is the sum of the individual or partial pressures of all gases in the mixture

• -solubility of a gas in a liquid at a particular temperature is proportional to the pressure of that gas above the liquid.
• -causes bends in scuba diving during ascent.

Test Tip: Henry->Heineken

• -gases go from a higher P or concentration to a region of lower P or concentration.
• -example is simple diffusion

-decrease in tissue oxygen or an oxygen supply inadequate to meet tissue needs

-a decrease in arterial blood oxygen tension

-an increased amount of CO₂ in blood

• 1) indifferent stage
• 2) compensatory stage
• 3) disturbance stage
• 4) critical stage

• Sea level-10,000 ft
• -in this stage the body reacts with increased heart rate and ventilation

Night vision loss occurs at 5000 ft

• 10,000-15,000 ft
• -increased B/P, heart rate,depth and rate of respiration.
• -efficency and performance of tasks requiring mental alertness becomes impaired

• 15,000-20,000 ft
• -characterized by dizziness, sleepiness, tunnel vision, and cyanosis
• -thinking becomes slow and muscle coordination decreases

• 20,000-30,000 ft
• -marked mental confusion and incapacitation followed by unconsciousness usually within a few minutes

-deficency in alveolar oxygen exchange

-reduction in the oxygen carrying capacity of the blood

-occurs when conditions exist that result in the reduced total cardiac output

-occurs when metabolic disorders or poisoning of the cytochrome oxidase enzyme system results in the cells inability to use molecular oxygen

Climb 100m=drop 1⁰C

• -760 torr
• -14.7 psi
• -101.3 kPa

• (P_B1 x FiO2₁) / P_B2 = FiO2₂
• -where P_B is the barometric pressure

-mean sea level refers to elevation above sea level

-above ground level refers to elevation above ground directly below aircraft

121.5 Hz

-the amount of time you are able to perform useful flying duties in an environment of inadequate O₂

refers to the amount of time from the point of exposure to an oxygen-deficient environment to the point deliberate function is lost

• -refered to as ear block resulrs from failure of the middle ear space to ventilate when going from low to high pressure
• -Descent

• -sinus block caused by acute or chronic inflammation
• -Ascent

• -toothache caused by exposure to changing barometric pressures
• -Ascent

• -caused by a large/sudden release of nitrogen from adipose tissue of the body upon decompression
• -replace the nitrogen with oxygen
• -Test tip: Barobariatrauma -> Pre-oxygenate first