Anesthesia Ventilators Exam Review | Questions and Answers
2024 Update
1. Power source is either: compressed gas, electricity or both (contemporary re- quire both)
2. Currently, the only ventilators that function solely on pneumatic gases are not anesthesia delivery
systems; these pneumatically powered ventilators are used in: patient transport and in magnetic
resonance imaging suites.
3. Drive mechanism-Classification of ventilators: Bellows or Pistons
4. Drive mechanism-Modern vents are classified as: double-circuit, pneumatical- ly driven
5. Double-circuit means that: a pneumatic force compresses a bellows, which empties its
contents into the patient (aka bellows-in-a box)
6. Driving gas is: oxygen, air, or a venturi mix of O2 and air (Dräger)
7. Cycling behavior: Modern ventilators use solid-state electronics for timing (time cycled,
control mode)
8. Cycling behavior describes the event that transitions the ventilator from: -
exhalation to inspiration and from inspiration to exhalation.
9. For most modern anesthesia ventilators, respiratory rate and I:E ratio are set in , either by
volume control ventilation (VCV) or pres- sure control ventilation (PCV); cycles the breath from
exhalation to inspiration and from inspiration to exhalation.: controlled modes
time
10.Modern ventilators use solid state electronics for timing. Driving gas flow ceases when: the set
tidal volume is delivered to the breathing circuit or when a certain pressure is reached.
11.Set TV and delivered TV quantities may differ due to: compliance, losses or leaks!
12.An electronic ventilator:: - Re-circulates exhaled patient gas through the ab- sorber (where
CO2 is removed) and fresh gas is added with enough pressure to move the gas into the
patient's lungs
- Helps protect the patient from high airway pressures
- Supplies rate, volume, oxygen, and pressure monitoring
- Vents excess gas out from the patient breathing circuit
13.The type of ventilator is described by how the bellows move during: EXPI- RATION
14.Bellows classification: Ascending or Descending
15.Descending Bellows (HANGING BELLOWS): - You won't find many of these anymore.
- The greatest danger is unrecognized disconnection of the patient FROM CIRCUIT.
- Bellows may stay "distended" (apparently full) but empty and just giving a "false impression
of being full" since gravity is what keeps them pulled down.
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, Anesthesia Ventilators Exam Review | Questions and Answers
2024 Update
16.Most common bellow ventilators: Ascending
17.Why are ascending bellows safer?: Disconnections are more readily notable (bellows will "not
look re-inflated")
18.Ascending bellows comes with both which are
: adult and pediatric bellows interchangeable
19.Bellows fill with: fresh gas and re-circulated exhaled gas from the patient breathing
circuit
20.The ventilator control module meters gas from the pressured gas supply (called drive gas) to:
pressurize the bellows housing (push bellows down)
21.The drive gas pressure pushes the bellows down and: forces the gas mixture into the patient's
lungs during inspiration
22.At the end of inhalation, the control module vents drive gas from: the bellows housing out
the exhaust port
23.Gas is allowed to flow from the patient's lungs through the: absorber and into the bellows.
24.During inspiration: Driving gas is delivered into the space between the bellows and its
housing. This causes the bellows to be compressed so that gas flows into the breathing system.
At the same time, the pop-off valve (which vents excess gases to the scavenging system) and
exhaust valve (which vents driving gas) are closed.
25.During exhalation: The bellows re-expands as breathing system gases and fresh gas flow into
it. Driving gas is vented to atmosphere through the exhaust valve. After the bellows is fully
expanded, excess gas from the breathing system is vented to the scavenging system through
the pop-off valve.
26.Ascending bellows fill during: exhalation
27.Bellows are filled with what gases: Mixed gases from the FGF and exhaled gases reinflate
the ventilator bellows.
28.When the bellows are filled and the pressure exceeds 2.5 cm H2O: the pop-off valve opens
and redirects the patient circuit gas to the scavenger system
29.Piston ventilators: Single-circuit (no drive gas)
30.Piston ventilators deliver more accurate: Tidal volume
31.In Piston ventilators, the reservoir bag: will cycle with respirations as the different valves
open and close
32.Piston ventilator advantages: More accurate tidal volume Motor-driven
piston: no oxygen or air is required (drive gas) Piston can be used
WITHOUT depleting O2 cylinder during Electricity Driving force
Reduce the costs of compressed and wasted gases. Quiet
For help with assignments, discussions, research papers, Ms. excel and ppt tasks contact
2024 Update
1. Power source is either: compressed gas, electricity or both (contemporary re- quire both)
2. Currently, the only ventilators that function solely on pneumatic gases are not anesthesia delivery
systems; these pneumatically powered ventilators are used in: patient transport and in magnetic
resonance imaging suites.
3. Drive mechanism-Classification of ventilators: Bellows or Pistons
4. Drive mechanism-Modern vents are classified as: double-circuit, pneumatical- ly driven
5. Double-circuit means that: a pneumatic force compresses a bellows, which empties its
contents into the patient (aka bellows-in-a box)
6. Driving gas is: oxygen, air, or a venturi mix of O2 and air (Dräger)
7. Cycling behavior: Modern ventilators use solid-state electronics for timing (time cycled,
control mode)
8. Cycling behavior describes the event that transitions the ventilator from: -
exhalation to inspiration and from inspiration to exhalation.
9. For most modern anesthesia ventilators, respiratory rate and I:E ratio are set in , either by
volume control ventilation (VCV) or pres- sure control ventilation (PCV); cycles the breath from
exhalation to inspiration and from inspiration to exhalation.: controlled modes
time
10.Modern ventilators use solid state electronics for timing. Driving gas flow ceases when: the set
tidal volume is delivered to the breathing circuit or when a certain pressure is reached.
11.Set TV and delivered TV quantities may differ due to: compliance, losses or leaks!
12.An electronic ventilator:: - Re-circulates exhaled patient gas through the ab- sorber (where
CO2 is removed) and fresh gas is added with enough pressure to move the gas into the
patient's lungs
- Helps protect the patient from high airway pressures
- Supplies rate, volume, oxygen, and pressure monitoring
- Vents excess gas out from the patient breathing circuit
13.The type of ventilator is described by how the bellows move during: EXPI- RATION
14.Bellows classification: Ascending or Descending
15.Descending Bellows (HANGING BELLOWS): - You won't find many of these anymore.
- The greatest danger is unrecognized disconnection of the patient FROM CIRCUIT.
- Bellows may stay "distended" (apparently full) but empty and just giving a "false impression
of being full" since gravity is what keeps them pulled down.
For help with assignments, discussions, research papers, Ms. excel and ppt tasks contact
, Anesthesia Ventilators Exam Review | Questions and Answers
2024 Update
16.Most common bellow ventilators: Ascending
17.Why are ascending bellows safer?: Disconnections are more readily notable (bellows will "not
look re-inflated")
18.Ascending bellows comes with both which are
: adult and pediatric bellows interchangeable
19.Bellows fill with: fresh gas and re-circulated exhaled gas from the patient breathing
circuit
20.The ventilator control module meters gas from the pressured gas supply (called drive gas) to:
pressurize the bellows housing (push bellows down)
21.The drive gas pressure pushes the bellows down and: forces the gas mixture into the patient's
lungs during inspiration
22.At the end of inhalation, the control module vents drive gas from: the bellows housing out
the exhaust port
23.Gas is allowed to flow from the patient's lungs through the: absorber and into the bellows.
24.During inspiration: Driving gas is delivered into the space between the bellows and its
housing. This causes the bellows to be compressed so that gas flows into the breathing system.
At the same time, the pop-off valve (which vents excess gases to the scavenging system) and
exhaust valve (which vents driving gas) are closed.
25.During exhalation: The bellows re-expands as breathing system gases and fresh gas flow into
it. Driving gas is vented to atmosphere through the exhaust valve. After the bellows is fully
expanded, excess gas from the breathing system is vented to the scavenging system through
the pop-off valve.
26.Ascending bellows fill during: exhalation
27.Bellows are filled with what gases: Mixed gases from the FGF and exhaled gases reinflate
the ventilator bellows.
28.When the bellows are filled and the pressure exceeds 2.5 cm H2O: the pop-off valve opens
and redirects the patient circuit gas to the scavenger system
29.Piston ventilators: Single-circuit (no drive gas)
30.Piston ventilators deliver more accurate: Tidal volume
31.In Piston ventilators, the reservoir bag: will cycle with respirations as the different valves
open and close
32.Piston ventilator advantages: More accurate tidal volume Motor-driven
piston: no oxygen or air is required (drive gas) Piston can be used
WITHOUT depleting O2 cylinder during Electricity Driving force
Reduce the costs of compressed and wasted gases. Quiet
For help with assignments, discussions, research papers, Ms. excel and ppt tasks contact
