On board EM

Question 1

List three law’s that govern air exchange

Answer 1

Boyle’s law
Henri’s law
Dalton’s law

Question 2

Explain Boyle’s law

Answer 2

Vol inversely equal to pressure
On board this means the higher the altitude the more vol. is available the less air pressure. O2 still at 21% however, there is less of all gases in the atmosphere. Therefore lungs compensate by filling with more air yet we are still less oxygenated. This affects internal respiration negatively. Saturation lowers everyone is hypoxic when they fly more then 8000 ft.

Question 3

At what altitude do we pass out?

and how long does it take?

Answer 3

35000ft. 30 sec-1 min

Question 4

What is the normal value of SP02 at 8000ft?

Answer 4

93%, 21%-15% decrease at 8000ft

Question 5

What are some signs and symptoms found at different levels of altitude?

Answer 5

0-10000 indifferent
> 10000 drunk with many ppl s/s
>20000 min before LOC
>35000 30s-1 min LOC

Question 6

If the patient is hypoxic what do we do?

Answer 6

If many ppl affected descend plane / O2

If one person affected O2 suppl.

Question 7

What can negatively affect oxygenation and why?

Answer 7

Weather can require the pilot to fly higher causing o2 to be more scarce.

Question 8

Explain Dalton’s law and give an example

Answer 8

Barometric pressure ( 760 mmHg) = to the sum of all partial pressures. O2 21% N 78% ,0.05% Co2 H2O exerts pressure too

Question 9

Explain Henri’s law

Answer 9

Partial pressure of a gas in liquid = Partial pressure of gas in gaseous form.
Alveolar Po2 = 100 mmHg so does Capillary PO2. This is used in hyperbaric chamber. CO, skin grafts, gangrene. >O2 is forced into blood.

Question 10

List 6 examples of on board EM

Answer 10

1- Cardiac *
2-Tympanic rupture : Valsalva maneuver, yawn, chew, swallow.
3- Aerodontalgia * ( sx)
4- Vomiting/Diarrhea * ( antiemetic, antiD)
5- Psychoses * Contentions
6- Hypoxemia