Anesthetic machine

Question 1

Volatile gaseous anesthetics are mixed with what for transport?

Answer 1

a carrier gas, either oxygen alone or oxygen combo with air or nitrous oxide

Question 2

What are the 3 broad parts that make up an anesthetic machine?

Answer 2

gas supply
anesthetic machine
breathing circuit

Question 3

how do you calculate oxygen cylinder remaining content?

Answer 3

content in L = pressure (bar) x cylinder size (L)

Question 4

another name for rebreathing circuit

Answer 4

closed circuit (these use soda lime scavengers)

so a nonrebreathing circuit is the open one

Question 5

for a pediatric t-piece used in with a nonrebreathing circuit what is your flow rate

Answer 5

minute volume at 500-600ml/kg/min and then, 2.5-3 x minute volume

ie. 2 kg puppy
2 x 500-600 ml =1000- 1200ml L/O2/min x 2.5-3 = min 2.5 L, max 3.6 L

Question 6

what is the APL

Answer 6

adjustable pressure-limiting valve

aka the pop-off valve. you close it temporarily for leak testing and manual ventilation.

Question 7

max. acceptable pressures in small and large animals

Answer 7

20cmH20 & 30 for large

Question 8

how do you calculate your reservoir bag size

Answer 8

tidal volume is typically 10-20 ml/kg

then, tidal volume multiplied by 6.

so 28 kg dog 280-560ml x 6 = 1.7L- 3.360L

Question 9

what to check on anesthetic machine before use (5)

Answer 9

O2 supply (and concentrator should produce up to 5L/min)
no stuck flowmeter indicator nor valves
sufficient anesthetic in vaporizer
no leaks (iso smells! sevo does not)
soda lime is adequate and not exhausted

Question 10

when leak testing what pressure do you need the machine to come to for how long

Answer 10

30 cmH20 for 10 sec