DR. KOST ANESTHESIA MACHINE QUESTIONS &
ANSWERS
What do you do if you have an issue with the machine during a case - Answer -- trouble
shoot for 30 sec - 1 min
- Take the patient off and bag ventilate
What do you do with a malfunctioning machine - Answer -Take out of service
How many more times greater is misuse of the anesthesia gas delivery equipment than
equipment failure - Answer -3x, lack of familiarity with the equipment and a failure to
check machine function are the most frequent causes
What kind of gas is in the respiratory reserve bag - Answer -Not fresh gas, still has
CO2
What agency sets the regulation for anesthesia machines - Answer -ASTM (American
Society for Testing and Materials) 1850,
Compressed gas is delivered in two ways - Answer -Compressed gas and via pipeline
How is O2 manufactured by - Answer -Fractional distillation of liquified air. This is the
most common method.
N2O is manufactured by - Answer -The thermal decompensation of ammonium nitrate.
Must contain 99% N20 by volume
How are O2 and N20 stored - Answer -O2 is stored as a gas and N2O is stored as a
liquid
-N2,O2,air gas form
-CO2 - liquid
Compressed gas purity is regulated by who - Answer -Pharmacopeia of the United
States (USP)
The transportation of compressed gas is regulated by who - Answer -Department of
transpiration (DOT) - the motor safety devision
-DOT regulates everything about cylinders (thickness, construction, etc)
Tanks on the side of machine are used for what - Answer -Emergency and mobility
(somewhere that does not have pipeline availability)
Where are the valves on a cylinder - Answer -Attached to the neck of the cylinder via
tapered thread
, Oxygen cylinder port is where - Answer -the gasses exit the cylinder from (point of exit)
Pressure relief device type - Answer -Disc device - a fragile disc or burst disc,
predetermined pressure is reached then the disc ruptures and the contents are
dispersed, all or nothing phenomenon
Fusible plug (woods metal) - bismuth, tin, cadmium, and lead, low melting point, temp
softens plug with resultant loss of cylinder contents, plug melts, all or nothing
phenomenon.
Pressure relief valve - opens at extreme pressures, spring loaded device designed to
reclose and prevent gas escape once the condition returns to normal, not a all or
nothing phenomenon. Safest device
Conical depression - Answer -Receives retaining screw
What is the PSI of a full O2 tank - Answer -1900 - 2200 (2000) = 660L
What is the PSI of a full N2O tank - Answer -750 - 745 = 1590l
Difference between gas and liquid in cylinder tanks - Answer -Gas psi will decrease
when volume decreases
Liquid psi will stay the sakes until liquid is gone
What is the only way to tell how much is left in a N2O tank - Answer -weigh it
you have 1000 psi in your O2 tank going at 6l how many minutes do you have left -
Answer -1000 psi approximately 330L
330L/6L flow = 55 min
Cylinder markings and labeling - Answer -- not supposed to be painted over, legible, do
not cover, required by DOT, must bear a label 2/3 the distance from the cylinder bottom,
have to check O2 cylinders every 2 years
How often do you have to check cylinders - Answer -- Inspection and internal
hydrostatic pressure test every 5 years, with special permit testing is performed every
10 yrs, tested to 1.66 of their service pressure
- an old test for this was the cylinder hammer ring test
what is the function of the cylinder crush gasket - Answer -prevent leaking, reduces
frictional flow
What type of valve is in a hanger yoke valve - Answer -floating check valve, prevents
transfixing of tanks
ANSWERS
What do you do if you have an issue with the machine during a case - Answer -- trouble
shoot for 30 sec - 1 min
- Take the patient off and bag ventilate
What do you do with a malfunctioning machine - Answer -Take out of service
How many more times greater is misuse of the anesthesia gas delivery equipment than
equipment failure - Answer -3x, lack of familiarity with the equipment and a failure to
check machine function are the most frequent causes
What kind of gas is in the respiratory reserve bag - Answer -Not fresh gas, still has
CO2
What agency sets the regulation for anesthesia machines - Answer -ASTM (American
Society for Testing and Materials) 1850,
Compressed gas is delivered in two ways - Answer -Compressed gas and via pipeline
How is O2 manufactured by - Answer -Fractional distillation of liquified air. This is the
most common method.
N2O is manufactured by - Answer -The thermal decompensation of ammonium nitrate.
Must contain 99% N20 by volume
How are O2 and N20 stored - Answer -O2 is stored as a gas and N2O is stored as a
liquid
-N2,O2,air gas form
-CO2 - liquid
Compressed gas purity is regulated by who - Answer -Pharmacopeia of the United
States (USP)
The transportation of compressed gas is regulated by who - Answer -Department of
transpiration (DOT) - the motor safety devision
-DOT regulates everything about cylinders (thickness, construction, etc)
Tanks on the side of machine are used for what - Answer -Emergency and mobility
(somewhere that does not have pipeline availability)
Where are the valves on a cylinder - Answer -Attached to the neck of the cylinder via
tapered thread
, Oxygen cylinder port is where - Answer -the gasses exit the cylinder from (point of exit)
Pressure relief device type - Answer -Disc device - a fragile disc or burst disc,
predetermined pressure is reached then the disc ruptures and the contents are
dispersed, all or nothing phenomenon
Fusible plug (woods metal) - bismuth, tin, cadmium, and lead, low melting point, temp
softens plug with resultant loss of cylinder contents, plug melts, all or nothing
phenomenon.
Pressure relief valve - opens at extreme pressures, spring loaded device designed to
reclose and prevent gas escape once the condition returns to normal, not a all or
nothing phenomenon. Safest device
Conical depression - Answer -Receives retaining screw
What is the PSI of a full O2 tank - Answer -1900 - 2200 (2000) = 660L
What is the PSI of a full N2O tank - Answer -750 - 745 = 1590l
Difference between gas and liquid in cylinder tanks - Answer -Gas psi will decrease
when volume decreases
Liquid psi will stay the sakes until liquid is gone
What is the only way to tell how much is left in a N2O tank - Answer -weigh it
you have 1000 psi in your O2 tank going at 6l how many minutes do you have left -
Answer -1000 psi approximately 330L
330L/6L flow = 55 min
Cylinder markings and labeling - Answer -- not supposed to be painted over, legible, do
not cover, required by DOT, must bear a label 2/3 the distance from the cylinder bottom,
have to check O2 cylinders every 2 years
How often do you have to check cylinders - Answer -- Inspection and internal
hydrostatic pressure test every 5 years, with special permit testing is performed every
10 yrs, tested to 1.66 of their service pressure
- an old test for this was the cylinder hammer ring test
what is the function of the cylinder crush gasket - Answer -prevent leaking, reduces
frictional flow
What type of valve is in a hanger yoke valve - Answer -floating check valve, prevents
transfixing of tanks
