Previous Test Flashcards
The complete FDA anesthesia machine checkout should be done….
Before the first case of the day
An E cylinder of O2 showing a pressure of 1000 PSIg will last approx. how long at a 5 L/min flow
60 mins. 660L/2200PSI = X/1000PSI X = 300 L 300/5 = 60 mins
Which of the following is NOT part of the low pressure system? A. Vaporizer B. common gas outlet C. O2 low pressure alarm D. Flow meter tubes E. floats
C. Low pressure O2 alarm
If you are in PSV mode and your patient is taking tidal volumes of 1100ml/breath with a pressure level of 15cmH2O and you want the tidal volume closer to 700 ml/breath then what should you adjust on the ventilator?
Decrease the pressure support level
When you increase the tidal volume from 750 to 1000 ml as well as increase your respiratory rate from 8 to 10 bpm, what will be the new minute ventilation?
10 lpm
Given a datex-ohmeda excel machine that has the following controls: tidal vol., RR, inspiratory flow rate, inspiratory pressure limit, inspiratory pause. If all other controls remain set, what occurs when the inspiratory pause button is depressed?
The expiratory time is decreased
While in VCV you change the RR from 10 to 20 bpm while keeping the peak flow rate constant, what do you expect to increase?
Peak inspiratory pressure
Which of the following statements can be correctly associated with the pumping effect?
Most pronounced at low concentration settings and causes a higher concentration of agent to be delivered with positive pressure
The N2O cylinder pressure reads 372 PSIg. You assume that
The tank is almost empty
Minute ventilation is a product of
RR and TV
Desflurane requires a heated vaporizer because
Heat energy from the room is insufficient to fuel its vaporization during use
Which cylinder has greatest volume?
H
Which mode is best to control the pressure exerted on the alveoli, but maximize tidal volume delivered?
PCV
Which of the following is NOT part of the intermediate pressure system? A. Vaporizer B. o2 fail safe device C. Low pressure O2 alarm D. N2O second stage pressure regulator E. pipeline pressure gauge
Vaporizer
The term “silent depletion” refers to
An E cylinder left open that slowly empties when e pipeline drops below regulated cylinder pressure
The output of an isoflurane vaporizer operated in Denver will have what relationship to the same vaporizer in Atlanta?
The Denver one may deliver a higher concentration than intended
What is the percent sevoflurane when fresh gas flow is 1L? (Carrier gas flow is 50ml)
1.3%
You are administering 1 lpm nitrous and 1 lpm oxygen using an older datex-ohmeda machine. Sudden loss of pipeline pressure. Fail safe activates. Back ups turned on. What happens to the floats?
The drop then rise to previous values
A hypothetical compressed gas called nitroair contain 50% N2O and 50% air. What color would the cylinder be?
Yellow and blue.
What is “auto-PEEP”
Pressure build up in the lungs that occurs when there in insufficient time for expiration.
Which of the following will not have any effect on the splitting ratio in a variable bypass vaporizer?
Barometric pressure
Changing only the I:E ratio from 1:1 to 1:4 will effect ventilation by
Increasing the inspiratory flow rate
All of the following are a benefit of application of positive end expiratory pressure except which of the following? A. Increases FRC B. Increases intrathoracic pressure C. Recruits collapsed alveoli D. Redistributes lung fluid E. splints and distended patent alveoli
B. increases intrathoracic pressure
While in PCV you change I:E from 1:2 to 1:4 which of the following parameters will increase with this change?
Expiratory time
Which of the following anesthetic agents has the lowest vapor pressure at 20 degrees C?
Sevoflurane
Depressing the O2 flush valve while the machine is turned off
Results in an O2 flow of 35-75 lpm to the common gas outlet
Given a large university medical center of 700 beds, which of the following piped gases are most likely to be provided from banks of cylinders.
Nitrous oxide
Mandatory safety features of current anesthesia machines include all of the following except A. O2/N2O proportioning system B. compresses gas assoc. standard fittings C. O2 flowmeter at extreme right of flowmeter cluster D. Locking common gas outlet E. vaporizer interlock device
Compressed gas assoc. standard fittings
What happens when a patient starts to take a spontaneous breath while in PCV?
The breath will be unassisted
What do you expect to happen when you change from PCV with and inspiratory pressure of 20 to VCV with a plateau pressure of 20 given the pulmonary compliance remains constant?
Decrease tidal volume
In a modern vaporizer, the splitting ratio will be altered such that a higher percentage of gas flows into the vaporizing chamber if the following situation occurs
The temperature of the agent decreases
If an E cylinder is empty, the pressure in the cylinder is
14.7 PSIa
What is a measure of the mean pressure being exerted on the alveolar wall during a mechanical breath?
Plateau pressure
Which government agency is responsible for regulating medical gas cylinders and containers in the US?
Dept. of Transportation
Changing only the I:E from 1:4 to 1:1 would have the following effect
Would increase the “auto-peep”—less time to exhale
Most modern vaporizers are classified as
Variable bypass, flow over, temperature compensated, agent specific, out of circuit
What information is obtained when performing an inspiratory hold maneuver during VCV?
Pressure exerted in alveoli
PISS prevents what
Incorrect gas cylinder connections to machine
Which of the following is not a step in anesthesia machine checkout A. Verify backup ventilation B. verify backup N2O C. Verify backup O2 D. Proper functioning unidirectional valves E. calibrate O2
Verify N2O
Which of the following is least potent Sevoflurane Desflurane Isoflurane
Desflurane
Each of the following modes could result in breath stacking except SIMV CMV IMV VCV
SIMV
At the end of an anesthetic, with the inhalation all agent and fentanyl being delivered, it is desirable to have the patient breathing spontaneously. Which mode of ventilation would you prefer?
PSV
If the O2 pressure drops to 10 PSI, in what order will things happen
Alarm sounds, device activates, N2O stops
What system prevents the wrong gas supply hose from being attached
DISS
In PCV, you want to increase the tidal volume because the sats fell. What could you do?
Increase pressure control settings
Will the O2 flush valve dilute the concentration of anesthetic delivered?
Yes
What is a “stacked breath”
Unsynchronized ventilator breath delivered immediately after a full patient inspiration
Pouring sevoflurane into an isoflurane vaporizer will
Significantly lower concentration than displayed on dial
