Chapter 02: How Ventilators Work
Cairo: Pilbeam’s Mechanical Ventilation: Physiological and
Clinical Applications, 6th Edition
MULTIPLE CHOICE .
1. The respiratory therapist enters modes and parameters into the
ventilator with which of the following?
a. Control logic
b. Input power
c. User interface
d. Drive mechanism
ANS: C
The user interface or control panel contains certain knobs, dials, or
keypads where the ventilator operator sets or enters certain
information to establish how the pressure and pattern of gas flow are
delivered by the machine. Inside the ventilator is the control logic or
control system that interprets the operator settings and produces and
regulates the desired output. The input power is the ventilator’s power
source that provides the energy to enable the ventilator to perform the
work of ventilating the patient. The drive mechanism is a mechanical
device that produces gas flow to the patient.
REF: pg. 19
2. A patient being transferred from a hospital to a skilled nursing facility
requires mechanical ventilation with a fractional inspired oxygen (FIO2)
of 0.21. The skilled nursing facility has no piped in gases. Which of the
following ventilators will be able to function in the skilled nursing
facility without any extra equipment?
a. Servoi
b. LTV 1000
c. Bird Mark 7
d. Bio-Med MVP-10
ANS: B
The type of ventilator that will be appropriate for this situation is one
that is electrically controlled and powered with a built-in air
compressor. The LTV 1000 fits this description. The Servoi requires both
a high-pressure gas source and electrical power. The Bird Mark 7 is a
pneumatic ventilator and will not be able to function in this situation.
The Bio-Med MVP-10 is also a pneumatic ventilator that won’t function
in this situation.
REF: pg. 17
Ipower source into the patient. This is known as which of the following?
a. Single-circuit
b. Open loop
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, c. Closed loop
d. Double-circuit
ANS: A
There are two types of internal circuits, the single- and the double-
circuit. The single-circuit allows the gas to flow from its power input
source to the patient. The double-circuit utilizes a primary power
source to generate a gas flow that compresses a mechanism such as a
bellows. The gas within the bellows will then flow to the patient. Open
loop and closed loop refer to the absence or presence, respectively, of
a feedback loop system.
REF: pg. 20 | pg. 21
4. A ventilator for which the primary power source generates a gas flow
that compresses another mechanism and causes the gas from inside
the mechanism to be delivered to the patient is known as which of the
following?
a. Single-circuit
b. Double-circuit
c. Closed loop
d. Open loop
ANS: B
In a double-circuit ventilator, the primary power source generates a
gas flow that couldmpresses a mechanism such as a bellows or “bag-
in-a-chamber.” The gas in the bellows or bag then flows to the patient.
In a single-circuit ventilator, the primary power source travels directly
to the patient. The closed and open loop refer to whether or not the
ventilator has a feedback loop system.
REF: pg. 20 | pg. 21
5. The function of the exhalation valve is to do which of the following?
a. Adjust the flow going to the patient.
b. Close during exhalation to vent
patient gas.
c. Seal the external circuit during
inspiration.
d. Determine the volume being
delivered.
ANS: C
During inspiration, gas fills the balloon and closes a hole in the
expiratory valve. Closing of the hole makes the patient circuit a sealed
system. During expiration, the balloon deflates, the hole opens, and
gas from the patient is exhaled into the room through the hole.
REF: pg. 22
6. In the image, what does “B” represent?
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Cairo: Pilbeam’s Mechanical Ventilation: Physiological and
Clinical Applications, 6th Edition
MULTIPLE CHOICE .
1. The respiratory therapist enters modes and parameters into the
ventilator with which of the following?
a. Control logic
b. Input power
c. User interface
d. Drive mechanism
ANS: C
The user interface or control panel contains certain knobs, dials, or
keypads where the ventilator operator sets or enters certain
information to establish how the pressure and pattern of gas flow are
delivered by the machine. Inside the ventilator is the control logic or
control system that interprets the operator settings and produces and
regulates the desired output. The input power is the ventilator’s power
source that provides the energy to enable the ventilator to perform the
work of ventilating the patient. The drive mechanism is a mechanical
device that produces gas flow to the patient.
REF: pg. 19
2. A patient being transferred from a hospital to a skilled nursing facility
requires mechanical ventilation with a fractional inspired oxygen (FIO2)
of 0.21. The skilled nursing facility has no piped in gases. Which of the
following ventilators will be able to function in the skilled nursing
facility without any extra equipment?
a. Servoi
b. LTV 1000
c. Bird Mark 7
d. Bio-Med MVP-10
ANS: B
The type of ventilator that will be appropriate for this situation is one
that is electrically controlled and powered with a built-in air
compressor. The LTV 1000 fits this description. The Servoi requires both
a high-pressure gas source and electrical power. The Bird Mark 7 is a
pneumatic ventilator and will not be able to function in this situation.
The Bio-Med MVP-10 is also a pneumatic ventilator that won’t function
in this situation.
REF: pg. 17
Ipower source into the patient. This is known as which of the following?
a. Single-circuit
b. Open loop
This study source was downloaded by 100000842568006 from CourseHero.com on 05-07-2022 13:36:11 GMT -05:00
https://www.coursehero.com/file/22098555/c2-1/
, c. Closed loop
d. Double-circuit
ANS: A
There are two types of internal circuits, the single- and the double-
circuit. The single-circuit allows the gas to flow from its power input
source to the patient. The double-circuit utilizes a primary power
source to generate a gas flow that compresses a mechanism such as a
bellows. The gas within the bellows will then flow to the patient. Open
loop and closed loop refer to the absence or presence, respectively, of
a feedback loop system.
REF: pg. 20 | pg. 21
4. A ventilator for which the primary power source generates a gas flow
that compresses another mechanism and causes the gas from inside
the mechanism to be delivered to the patient is known as which of the
following?
a. Single-circuit
b. Double-circuit
c. Closed loop
d. Open loop
ANS: B
In a double-circuit ventilator, the primary power source generates a
gas flow that couldmpresses a mechanism such as a bellows or “bag-
in-a-chamber.” The gas in the bellows or bag then flows to the patient.
In a single-circuit ventilator, the primary power source travels directly
to the patient. The closed and open loop refer to whether or not the
ventilator has a feedback loop system.
REF: pg. 20 | pg. 21
5. The function of the exhalation valve is to do which of the following?
a. Adjust the flow going to the patient.
b. Close during exhalation to vent
patient gas.
c. Seal the external circuit during
inspiration.
d. Determine the volume being
delivered.
ANS: C
During inspiration, gas fills the balloon and closes a hole in the
expiratory valve. Closing of the hole makes the patient circuit a sealed
system. During expiration, the balloon deflates, the hole opens, and
gas from the patient is exhaled into the room through the hole.
REF: pg. 22
6. In the image, what does “B” represent?
This study source was downloaded by 100000842568006 from CourseHero.com on 05-07-2022 13:36:11 GMT -05:00
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