Flight Physiology

Question 1

states that for a given mass and constant volume of a gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature.

Answer 1

Gay Lussac’s Law

Question 2

says that the total pressure of a gas mixture is the sum of the partial pressures of all gases. In addition, it describes how a pressure is exerted by a gas at various altitudes, and how that pressure affects the partial pressure of the said gas.

Answer 2

Dalton’s law

Question 3

states the amount of gas dissolved in a solution is directly proportional to the pressure of the gas over the solution.

Answer 3

Henry’s law

Question 4

states that the rate of diffusion of a gas across a permeable membrane is determined by the chemical nature of the membrane itself, the surface areas of the membrane, the partial pressure gradient of the gas across the membrane, and the thickness of the membrane.

Answer 4

Fick’s Law

Question 5

states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight. This means that diffusion will happen at a faster rate if the gas is thinner and at a slower rate if the gas is heavier.

Answer 5

Graham’s law

Question 6

P1 means

Answer 6

One Atmospheric pressure

Question 7

V1 means

Answer 7

starting volume

Question 8

P2 means

Answer 8

Highest ATM of altitude

Question 9

V2 means

Answer 9

Your ending volume

Question 10

What is the calculation to find V2

Answer 10

P1V1/P2 = V2

Question 11

What is the calculation for Boyles Law

Answer 11

P1V1 = P2V2

Question 12

Solve: At ATM 1 the stomach has 4L of volume secondary to dislodged ET tube, the pt was taken to 3000 ft (o.9 ATM) . What is the new stomach volume?

Answer 12

1 x 4 / 0.9 = 4.4 L

Question 13

When fluid in ear causes pain and the is an inability to clear the ear on descent, this is considered

Answer 13

Barotitis Media

Question 14

Barotitis Media is recognized during

Answer 14

descent

Question 15

Fluid in the sinuses that causes pain during flight is called

Answer 15

Barosinusitis

Question 16

Barosinusitis is identified during

Answer 16

Ascent

Question 17

Barobaria trauma is identified during

Answer 17

ascent

Question 18

Nitrogen is displaced from lipid cells during

Answer 18

barobaria trauma

Question 19

treatment of barobaria trauma is

Answer 19

high flow 02

Question 20

barodentalgia is

Answer 20

sharp pain in teeth during ascent

Question 21

States as altitude increases, ATM decreases and gas in an enclosed space will expand

Answer 21

Boyles law

Question 22

states that a change in temperature will cause a change in volume

Answer 22

Charles law

Note: If you were to let a balloon increase in altitude, that balloon would have a decrease in volume as temperature decreases. For every 1000 feet increase in altitude, the temperature decreases by 2°C. In addition, it can be said that for every 150 meters you increase in altitude, you drop 1°C.

Question 23

States the pressure exerted against the sides of a container are directly proportional to its temperature

Answer 23

Gary-Lussacs law

Question 24

For every 1000’ ascended, the temp will

Answer 24

decrease 2 degrees Celsius

Question 25

For every 150 meters ascended the temp will

Answer 25

decrease 1 degree Celsius

Question 26

the amount of oxygen dissolved in the capillary blood is directly proportional to the pressure of the oxygen over the capillary blood

Answer 26

Henry’s law

Question 27

If the atmospheric pressure at 18,000 ft. MSL is 380 torr, what would the partial pressure of oxygen at that altitude?

Answer 27

80

Question 28

A patient suffering from decompression sickness is an example of which gas law?

Answer 28

Henry’s law

Question 29

When administering high concentrations of oxygen to alleviate hypoxic hypoxia, you are altering which component of which gas law?

Answer 29

Henry’s law

Note: Giving high concentrations of O2 is affecting Henry’s law and the solubility of oxygen diffusion. Graham’s law affects the active process of diffusion, which is moving from a higher concentration to a lower concentration. Henry’s law is affecting the concentration, the solubility and the pressure that oxygen molecules need to be placed under to diffuse more rapidly into a solution (blood).

Question 30

An ARDS patient with a current SpO2 of 85% is being transferred. The current FiO2 via the mechanical ventilator is set at 50%. The current referring hospital’s elevation is 500 ft. (30.47) The pilot advises the highest altitude you’ll be flying at will be 5,000 ft. Using the chart below, calculate the required FiO2 change needed based on the Desired FiO2 by Altitude Formula.

Answer 30

58%

Question 31

The indifferent stage of hypoxia causes a reduction in night vision at what altitude?

Answer 31

4000 feet

Question 32

You are scuba diving in a local lake and descend to 132 ft below the surface. At this point in the descent, you are experiencing how many atmospheres?

Answer 32

5 ATM’s

Question 33

Flicker Vertigo can cause seizures to occur at what Hertz (Hz) range?

Answer 33

4-20 Hz

Question 34

Identify the time of useful consciousness in an explosive decompression at an altitude of 43,000 ft?

Answer 34

3-5 secs