Anesthesia Machine

Question 1

What is the pressure and contents of a nitrous E-cylinder?

Answer 1

1590 Liters

745 psig when full

Question 2

What agents have the greatest to lease vapor pressures?

Answer 2

Desflurane 681 mmHg
Isoflurane 240 mmHg
Sevoflurane 160 mmHg

Question 3

What is the best location for sampling CO2 for maximum waveform fidelity?

Answer 3

Closest to the patient.

Question 4

What is the best method for monitoring capnography during MAC cases?

Answer 4

Nasal cannula with CO2 sampling capabilities and use of a facemask for oxygenation

Question 5

What happens when the ocnnection between the anesthesia ventilator and the anesthesia scavenging system becomes occluded?

Answer 5

Barotrauma

Question 6

What pressure is the e-cylinder regulated in an anesthesia machine?

Answer 6

45 - 50 psi

Question 7

What is the pressure vs. cylinder contents of a nitrous e-cylinder?

When will the pressure drop in an e-cylinder?

Answer 7

745 psi
1590 L

Pressure will drop when contents drop to about 20%.

Question 8

How do you calculate N2O left in a tank?

Answer 8

Empty tank weighs 14kg

If tank weighs 15 kg, then there is 1 kg left in the tank.

1kg = 1000g * (1 mole/44 grams N2O) = 22.7 mole

22.4 L/1 mole