Gas Laws Flashcards
boyles law
Altitude increases, atmospheric pressure drops and volume of interior gas increases
Et cuff
Pneumocephalus
Talgia- ascent
Sitis- ascent and decent
Daltons
Pressure of gas = partial pressures of each gas.
Fio2xP1/P2
- must = less than 100% to allow flight
Need to increase O2% at altitude to maintain oxygenation
At sea level 760mmHg
Stages of hypoxia
ICDC
Indifferent- loss of night vision over 5k
Compensatory- increase HR, RR
Disturbance- slurred speech, altered, impaired
Critical- unable to do any task
Types of Hypoxia
Hypoxia- lack of pressure to allow O2 to diffuse
Hypemic- lack of blood, RBC
Stagnant- blood flow blocked.
Histotoxic - cells can’t use O2. Cyanide. Alcohol. CO
Gay lusaac
Volume staying the same. Temperature will increase pressure.
Think tires.
O2 tank pressures may be different at different temps.
Grahams law
Rate of diffusion of gas through liquid is proportional to the solubility of the gas and inverse to proportional to the square root of its density
Smaller molecules diffuse faster
CO2 is smaller and more soluble than O2
Charles law
1000’ change = 2 degree c change up or down
As temp goes up. Volume goes up.
Warmer temps cause molecules to spread which decreases lift ability of helo
Keep patients warm
Henry’s law
Dissolved gas in a solution is directly proportional to the pressure of the gas
As you dive down into water you increase pressure 1atm ever 33’
As pressure decreases during ascent, nitrogen gas bubbles leak out of the cell
Bends- pain from nitrogen accumulation in joints
Chokes-12 hours. Bubbles block pulmonary vessels
Staggers- bubbles in ears. Headache, slow, verbal issues
Parasthesia- impacts nerve tracts. Weakness. Tingling
Hyperbaric chamber is treatment
Ficks law
Rate of diffusion is affected by:
Atmospheric pressure
Surface area of membrane
Thickness of membrane.
Peep can help
