Flashcards in Anesthesia Machine Deck (92)
Anesthetized patients encounter what type of depression from the anesthetic drugs?
Without supplemental oxygen, what is very possible to occur in an anesthetized patient?
What color are oxygen tanks?
What color are Nitrous Oxide tanks?
How much does an empty E Cylinder weigh?
How much does an empty H Cylinder weigh?
How much oxygen can an E Cylinder contain?
How much oxygen does an H Cylinder contain?
How much nitrous oxide does an E Cylinder contain?
How much nitrous oxide does an H Cylinder contain?
What is the tank cylinder pressure in both E and H oxygen tanks?
What is the tank cylinder pressure for E and H nitrous oxide tanks?
750 psi @ 20 celsius
What is the pressure at which both E and H oxygen and nitrous oxide tanks should be changed at?
T/F: The cylinder pressure gauge on a nitrous oxide tank reads the total amount of gas and liquid in the tank.
False - it reads only the pressure of the gas within the tank.
When does the gauge change on a nitrous oxide tank?
Not until all of the liquid has evaporated.
What is the equation to calculate the remaining oxygen within an E Cylinder?
2200 psi/660 L = psi left on E tank/ X Liters
How do you find out how many minutes of oxygen we have remaining?
X liters/Flow Liters per Min
What are 3 pros for using a quick coupler?
- Allows rapid connection
- Allows rapid disconnection
- Gas specific fittings
You use to Diameter Index Safety System for which 2 types of cylinders?
H or G cylinders
A DISS fitting has what 2 special features?
Gas-specific diameter and thread
What type of cylinder is used with a Pin Index Safety System?
What do you attach an E cylinder to with the Pin Index Safety System?
Hanger yoke site
What are 3 types of pressure relief devices that can be used to alleviate high pressure/temp?
- Rupture disc
- Pressure relief valve
- Fusible plug
T/F: Room air is adequate for normal tissue function in healthy awake patients.
What do you use when there are 2 E cylinders connected to one machine?
How should E tanks be stored?
In a rack.
How should H cylinders be stored?
Secured to a wall.
T/F: Full tanks should be stored with empty tanks.
False - full tanks should be separated from empty tanks.
Is it ok to store compressed gas cylinders near heat and electrical wiring?
No, keep them away from heat and electrical wiring.
O2 should be kept at least how far away from combustibles?
Should cylinder valves be opened slowly or quickly?
What are 2 things to do when transporting and handling E cylinders?
- Carry with both hands, one at a time
- Use an approved cart
What are 3 things to remember when transporting an H cylinder?
- Use approved trolley
- Attach metal cap
- Chain to trolley
What is the oxygen output range for an oxygen
93% USP minimum - 95% maximum
What does the dial on a cylinder pressure gauge measure?
Reads remaining gas pressure (psi) left in cylinder.
What is another name for the pressure reduction valve?
What does the pressure reduction valve do?
Reduces cylinder pressure to a fixed 50 psi.
The pressure reduction valve provides a constant pressure of what to what?
50 psi to the flowmeter
The amount of O2 in L/min that travels through the machine and is delivered to the patient is known as what?
The height of the ball/bobbin that rises within a glass tube in the flow-meter is proportional to what?
The flow of gas through the tube.
Why is it important to avoid excessive torque when closing flow-meter knobs?
They can become stripped and broken.
Gas passing through the flow-meter is reduced from what to what?
50 psi to about 15 psi
Where is the oxygen flow-meter in a series of meters?
Last, closest to the patient.
The N2O:O2 should not exceed what ratio?
What can be caused if this ratio is exceeded?
What bypasses the vaporizer and delivers O2 directly to the patient breathing circuit?
What does the quick flush deliver?
35-75 LPM of O2
What are 4 proper uses of the quick flush?
- Deliver oxygen to critically ill patient
- Lower anesthetic (%) in breathing circuit
- Speed recovery
- Flush residual vapors from breathing circuit
What do you need to be careful of when using the quick flush in small animals?
Over-inflation of lungs
Do not use the quick flush valve on a small patient attached to what type of system?
Low volume breathing system (non-breathing system)
What does STP stand for?
Standard temperature and pressure
Most anesthetic gases used in clinics are what type of liquids at STP?
What are the 2 most commonly used anesthetic gases?
Will Nitrous oxide produce general anesthesia?
What does VOC stand for?
Vaporizer out of circuit
Which is used most commonly, VOC or VIC?
Which is a complex precision vaporizer, VOC or VIC?
Carrier gas equals what in a VOC?
Carrier gas = fresh gas
Carrier gas equals what in a VIC?
Carrier gas = patient gases
Are VOCs agent-specific?
VOCs can be used with re-breathing systems, non-rebreathing systems or both?
What should always be done with the gas exiting the vaporizer?
What converts volatile anesthetic liquids to anesthetic vapor and adds it to the carrier gas?
The output % on a vaporizer is dependent on what?
Vaporizer dial setting
The process of evaporation in a closed container will proceed until there are as many molecules returning to the liquid as there are escaping, this state of equilibrium is know as what?
Saturated vapor pressure (SVP)
Does kinetic energy decrease or increase with temperature?
If temperature increases, does SVP decrease or increase?
What is the SVP of Sevoflurane at 20C?
What is the SVP of Isoflurane at 20C?
What is the SVP of Desflurane at 20C?
Which type of vaporizers deliver "precise" concentrations of anesthetic vapor?
What kind of agents are the best to use with a precision vaporizer?
What are 3 examples of these?
- Agents with a high SVP
- sevoflurane, isoflurane, desflurane
Does temperature affect kinetic energy?
Do most vaporizers compensate for temperature?
What should always be checked on the vaporizer prior to use?
Amount of liquid anesthetic remaining.
When should vaporizers be refilled?
When the level of liquid anesthetic is below the half-full mark.
What do you do if you fill the vaporizer with the wrong anesthetic agent?
Drain and flush with 1 L/min O2 until dry
Are VOC precision or non-precision?
- VOC = precision
- VIC = non-precision
Does a non-precision (VIC) vaporizer need to use an agent with a high SVP or a low SVP?
Very low SVP
What is the concentration of anesthetic delivered with a non-precision (VIC) vaporizer?
The concentration of anesthetic delivered with a non-precision (VIC) vaporizer can vary with what 4 factors?
- Patient ventilation
- Dial setting
- Back pressure
What are 2 examples of temperature compensation valves?
- "Liquid Bellows"
Is liquid anesthetic agent normally found in the by-pass channel?
Which is better for preventing back pressure, a short or long inlet tube?
Long inlet tube
It is important to not do what with all types of vaporizers?
- Do not tip over/shake vaporizer
- Liquid anesthetic enters by-pass channel and a lethal dose may be delivered to the patient
If a vaporizer gets tipped over/shaken, what should be done?
Run O2 through the machine with the vaporizer off for at least 15-30 minutes.
What should always be done to the vaporizer before transporting it?
Should be emptied.
If the vaporizer being used does not have a mechanism that accounts for changes in barometric pressure, what needs to be done at higher altitudes?
The dial seeing on the vaporizer must be decreased.
What are 3 factors that can have an effect on the output concentration of the anesthetic vaporizer if no compensating mechanism is present?
Desflurane boils at what temperature?
Which liquid anesthetic agents requires a special precision vaporizer?
Desflurane is electrically heated to what temperature?