Flight Phys Flashcards
Temp change for q 1000’ ascent
2 degrees Celcius
Gay Lussac’s factors
Temp and pressure (container is fixed)
-volume is constant
Factors that affect Henry’s law
- change concentration
- place gas under pressure
- change surface area.
Indifferent stage of hypoxia
0-10k ft
SaO2: 90-98%
Hr /rr increase
Compensatory stage of hypoxia
10k-15k ft
O2: 80-90%
Night vision
Disturbance stage
15k-20k
O2: 70-80%
Coordination, speech, handwriting, drunk
Cyanosis, hyperventilation
Critical stage of hypoxia
20k-25k ft
O2: 60-70%
Unable to sit upright, seizures, jerking, unconsciousness.
Altitude & desired O2
(FiO2 x current barometric pressure) / new barometric pressure = FiO2 required at new altitude.
-important for neonatal transports. PDA dependency.
Higher concentration of O2 administered to hypoxic pt relates to which
Law?
Increasing partial pressure of air in lungs to influence O2 concentration in liquid blood: Henry’s law.
Higher concentration of a gas in blood transferring to lower concentration cell relates to which law?
Graham’s law
Charles law factors
Volume & Temp, pressure is constant
Hypoxic hypoxia Ventilation reduction
Reduced barometric pressure, strangulation, apnea, laryngospasm, asthma, hypo ventilation
Hypoxic hypoxia reduction of gas exchange
Pneumonia, drowning, atelectasis, emphysema, pneumothorax, pulmonary embolism, congenital heart defects, physiological shunting.
Causes of Hypemic hypoxia
Anemias, hemorrhage, hemoglobin abnormalities, drugs (nitrates, sulfanilamides), chemicals (cyanide, CO)
Causes of stagnant hypoxia
Heart failure, shock, continuous positive pressure breathing, acceleration (g forces), pulmonary embolism
