Chapter 42 Mechanical Ventilators

Chapter 42  Mechanical Ventilators

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. Which of the following major categories of ventilator function are useful in classifying ventilators?
1. control scheme
2. power conversion
3. ventilator output
a.
1 and 2
b.
1 and 3
c.
2 and 3
d.
1, 2, and 3

ANS: D
To understand mechanical ventilators, we must first understand their four basic functions:
• input power
• power transmission and conversion
• control system
• output (pressure, volume, and flow waveforms)

DIF: Recall REF: p. 1007 OBJ: 1

2. A ventilator can derive its input power from which of the following sources?
1. alternating current (AC) electricity
2. battery
3. pneumatic
a.
1 and 2
b.
1 and 3
c.
2 and 3
d.
1, 2, and 3

ANS: D
The power source for a ventilator is either electrical energy (Energy = Volts × Amperes × Time) or compressed gas (Energy = Pressure × Volume).

DIF: Recall REF: p. 1007 OBJ: 1

3. For which of the following uses might you consider the use of a purely pneumatically powered ventilator?
1. as a backup to electrically powered ventilators
2. when electrical device cannot be used (e.g., magnetic resonance imaging)
3. during certain types of patient transport
a.
1 and 2
b.
1 and 3
c.
2 and 3
d.
1, 2, and 3

ANS: D
These devices are ideal in situations where electrical power is unavailable (e.g., during certain types of patient transport) or as a backup to electrically powered ventilators in case of power failures. They are also particularly useful where electrical power is undesirable, as near magnetic resonance imaging equipment.

DIF: Application REF: p. 1007 OBJ: 2

4. Primary drive mechanisms used by modern ventilators include which of the following?
1. compressed gas or reducing valve
2. hydraulic or fluidic compressor
3. electrical motor or compressor
a.
1 and 2
b.
1 and 3
c.
2 and 3
d.
1, 2, and 3

ANS: B
Drive mechanisms can be either (1) a direct application of compressed gas via a pressure reducing valve or (2) an indirect application via an electric motor or compressor.

DIF: Recall REF: p. 1007 OBJ: 2

5. Types of output control valves used in modern ventilators include all of the following except:
a.
pneumatic diaphragm valve
b.
proportional valve
c.
electromagnetic poppet or plunger
d.
linear screw valve

ANS: D
Commonly used output control valves include the pneumatic diaphragm, electromagnetic poppet/plunger valve, and the proportional valve. Descriptions of these devices can be found in respiratory care equipment textbooks.

DIF: Recall REF: p. 1007 OBJ: 2