Question 1

What is the simplest way to increase the humidity output of a humidifier?

Accepted Answer

A)   Increase the time that the gas and the water are in contact.
B)   Increase the surface area between the water and the gas.
C)   Decrease the water vapor pressure of the gas.
D)   Increase the temperature of either the water or the gas.E) B) and C)
F) B) and D)

Question 2

What should happen when the remote temperature sensor of a heated humidifier becomes disconnected or fails?
1)  Power to the heater should be interrupted.
2)  Auditory and visual alarms should trigger.
3)  The unit's outlet valve should lock closed.

Accepted Answer

A)  1 and 2 only
B)  2 and 3 only
C)  1 and 3 only
D)  1, 2, and 3E) All of the above
F) None of the above

Question 3

Which of the following inspired conditions should be maintained when delivering medical gases to the nose or mouth?

Accepted Answer

A)   50% relative humidity (RH)  at 20° to 22° C
B)   100% RH at 20° to 22° C
C)   80% RH at 28° to 32° C
D)   100% RH at 32° to 35° CE) A) and B)
F) C) and D)

Question 4

What is the most reliable indicator that the gas delivered by a servo-controlled heated-wire humidifier system is fully saturated at the airway?

Accepted Answer

A)   Observing no visible condensate anywhere in the delivery tubing
B)   Confirming an airway temperature between 32° and 35° C
C)   Observing a few drops of condensate at or near the patient's airway
D)   Observing condensate over the full length of the delivery tubingE) All of the above
F) None of the above

Question 5

Inhalation of dry gases can do which of the following?
1)  Increase viscosity of secretions.
2)  Impair mucociliary motility.
3)  Increase airway irritability.

Accepted Answer

A)  1 and 2 only
B)  3 only
C)  1 and 3 only
D)  1, 2, and 3E) A) and B)
F) B) and D)

Question 6

Which of the following factors cause the isothermic saturation boundary (ISB)  to shift farther down into the airways?
1)  Decreased ambient temperature
2)  Increased tidal volume (VT) 
3)  Endotracheal intubation

Accepted Answer

A)  1 and 2 only
B)  2 and 3 only
C)  1 and 3 only
D)  1, 2, and 3E) A) and C)
F) C) and D)

Question 7

The aerosol output (in mg/L)  of an ultrasonic nebulizer depends mainly on which of the following?

Accepted Answer

A)   Signal amplitude
B)   Chamber baffling
C)   Source current
D)   Signal frequencyE) A) and D)
F) C) and D)

Question 8

To produce the highest possible density aerosol from an ultrasonic nebulizer, how would you set the controls?

Accepted Answer

A)   Amplitude low, flow rate high
B)   Amplitude high, flow rate low
C)   Amplitude low, flow rate low
D)   Amplitude high, flow rate highE) A) and C)
F) A) and B)

Question 9

Which type of humidifier "traps" the patient's body heat and expire water vapor to raise the humidity of inspired gas?

Accepted Answer

A)   Membrane
B)   Bubble
C)   Heat and moisture exchanger
D)   PassoverE) B) and C)
F) None of the above

Question 10

The greater the temperature of the gas, the:

Accepted Answer

A)   more water vapor it can hold.
B)   less water vapor it can hold.
C)   less efficient the humidifier is.
D)   more water vapor is lost.E) B) and C)
F) A) and D)

Question 11

When using nebulizers, where should you place them to minimize risk of contamination?

Accepted Answer

A)   In the inspiratory limb only, at a high point in the circuit
B)   In both the expiratory and inspiratory limbs, at high points in the circuit
C)   In the expiratory limb only, at a low point in the circuit
D)   In both the expiratory and inspiratory limbs, at low points in the circuitE) A) and B)
F) All of the above

Question 12

Where should you place the thermistor probe for a servo-controlled heated humidifier being used on a patient receiving mechanical ventilation?

Accepted Answer

A)   In the expiratory limb of the circuit, near but not at the "wye"
B)   In the inspiratory limb of the circuit, as close to the "wye" as possible
C)   In the expiratory limb of the circuit, as close to the "wye" as possible
D)   In the inspiratory limb of the circuit, near but not at the "wye"E) C) and D)
F) A) and D)

Question 13

Which of the following are potential hazards of using a heated humidifier during mechanical ventilation?
1)  Aerosolization of condensate during disconnection
2)  Underhydration or impaction of secretions
3)  Hypoventilation due to increased dead space
4)  Unintended tracheal lavage from condensate

Accepted Answer

A)  1 and 3 only
B)  2, and 3 only
C)  3 and 4 only
D)  1, 2, and 4 onlyE) All of the above
F) B) and C)

Question 14

Which of the following measures can help to ensure a good sputum sample?

Accepted Answer

A)   Using an ultrasonic nebulizer instead of a jet nebulizer
B)   Using a 5% saline solution instead of a 3% concentration
C)   Having the patient rinse the mouth or blow the nose before induction
D)   Using the lowest possible aerosol density (high flow and low output) E) All of the above
F) B) and C)

Question 15

How often should heat and moisture exchangers be inspected and replaced?

Accepted Answer

A)   At least every shift
B)   When contaminated by secretions
C)   At least every day
D)   When condensate is visibleE) None of the above
F) B) and D)

Question 16

Which of the following statements is false of heat and moisture exchangers (HMEs) ?

Accepted Answer

A)   Moisture output falls at high volumes and rates of breathing.
B)   High inspiratory flows and high FiO2 values can decrease HME efficiency.
C)   In-use HMEs have little effect on flow resistance to breathing.
D)   HMEs reduce bacterial colonization of ventilator circuits.E) A) and B)
F) A) and C)

Question 17

Conditions that can cause temperature "overshoot" with servo-controlled heated humidifiers include which of the following?
1)  The unit is allowed to warm up without flow.
2)  Flow is decreased during normal operation.
3)  The airway temperature probe becomes dislodged.
4)  The unit reservoir is refilled with sterile water.

Accepted Answer

A)  1 and 3 only
B)  1, 2, and 3 only
C)  3 and 4 only
D)  2, 3, and 4 onlyE) B) and D)
F) B) and C)

Question 18

Administration of dry gases at flows exceeding 4 L/min can cause which of the following?
1)  Structural damage
2)  Heat loss
3)  Water loss

Accepted Answer

A)  1 and 2 only
B)  2 and 3 only
C)  1 and 3 only
D)  1, 2, and 3E) A) and B)
F) A) and C)

Question 19

The particle size produced by an ultrasonic nebulizer depends mainly on which of the following?

Accepted Answer

A)   Blower (fan)  speed
B)   Signal amplitude
C)   Signal frequency
D)   Chamber bafflingE) A) and C)
F) All of the above

Question 20

All mist tents prevent CO2 build-up by what process?

Accepted Answer

A)   Recirculating the gas
B)   Providing high gas flows
C)   Using CO2 absorbers
D)   Cooling the gasE) None of the above
F) C) and D)

Exam 38: Humidity and Bland Aerosol Therapy

When using nebulizers, where should you place them to minimize risk of contamination?

Correct Answer
verified

The aerosol output (in mg/L) of an ultrasonic nebulizer depends mainly on which of the following?

Correct Answer
verified

To produce the highest possible density aerosol from an ultrasonic nebulizer, how would you set the controls?

Correct Answer
verified

The particle size produced by an ultrasonic nebulizer depends mainly on which of the following?

Correct Answer
verified

What is the simplest way to increase the humidity output of a humidifier?

Correct Answer
verified

Which type of humidifier "traps" the patient's body heat and expire water vapor to raise the humidity of inspired gas?

Correct Answer
verified

What should happen when the remote temperature sensor of a heated humidifier becomes disconnected or fails? 1) Power to the heater should be interrupted. 2) Auditory and visual alarms should trigger. 3) The unit's outlet valve should lock closed.

Correct Answer
verified

Where should you place the thermistor probe for a servo-controlled heated humidifier being used on a patient receiving mechanical ventilation?

Correct Answer
verified

Which of the following inspired conditions should be maintained when delivering medical gases to the nose or mouth?

Correct Answer
verified

Which of the following statements is false of heat and moisture exchangers (HMEs) ?

Correct Answer
verified

Correct Answer
verified

Inhalation of dry gases can do which of the following? 1) Increase viscosity of secretions. 2) Impair mucociliary motility. 3) Increase airway irritability.

Correct Answer
verified

Which of the following are potential hazards of using a heated humidifier during mechanical ventilation? 1) Aerosolization of condensate during disconnection 2) Underhydration or impaction of secretions 3) Hypoventilation due to increased dead space 4) Unintended tracheal lavage from condensate

Correct Answer
verified

The greater the temperature of the gas, the:

Correct Answer
verified

All mist tents prevent CO₂ build-up by what process?

Correct Answer
verified

Which of the following measures can help to ensure a good sputum sample?

Correct Answer
verified

Administration of dry gases at flows exceeding 4 L/min can cause which of the following? 1) Structural damage 2) Heat loss 3) Water loss

Correct Answer
verified

What is the most reliable indicator that the gas delivered by a servo-controlled heated-wire humidifier system is fully saturated at the airway?

Correct Answer
verified

Which of the following factors cause the isothermic saturation boundary (ISB) to shift farther down into the airways? 1) Decreased ambient temperature 2) Increased tidal volume (V_T) 3) Endotracheal intubation

Correct Answer
verified

How often should heat and moisture exchangers be inspected and replaced?

Correct Answer
verified

Exam 38: Humidity and Bland Aerosol Therapy

When using nebulizers, where should you place them to minimize risk of contamination?

Correct AnswerverifiedShow Answer

The aerosol output (in mg/L) of an ultrasonic nebulizer depends mainly on which of the following?

Correct AnswerverifiedShow Answer

To produce the highest possible density aerosol from an ultrasonic nebulizer, how would you set the controls?

Correct AnswerverifiedShow Answer

The particle size produced by an ultrasonic nebulizer depends mainly on which of the following?

Correct AnswerverifiedShow Answer

What is the simplest way to increase the humidity output of a humidifier?

Correct AnswerverifiedShow Answer

Which type of humidifier "traps" the patient's body heat and expire water vapor to raise the humidity of inspired gas?

Correct AnswerverifiedShow Answer

What should happen when the remote temperature sensor of a heated humidifier becomes disconnected or fails? 1) Power to the heater should be interrupted. 2) Auditory and visual alarms should trigger. 3) The unit's outlet valve should lock closed.

Correct AnswerverifiedShow Answer

Where should you place the thermistor probe for a servo-controlled heated humidifier being used on a patient receiving mechanical ventilation?

Correct AnswerverifiedShow Answer

Which of the following inspired conditions should be maintained when delivering medical gases to the nose or mouth?

Correct AnswerverifiedShow Answer

Which of the following statements is false of heat and moisture exchangers (HMEs) ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Inhalation of dry gases can do which of the following? 1) Increase viscosity of secretions. 2) Impair mucociliary motility. 3) Increase airway irritability.

Correct AnswerverifiedShow Answer

Which of the following are potential hazards of using a heated humidifier during mechanical ventilation? 1) Aerosolization of condensate during disconnection 2) Underhydration or impaction of secretions 3) Hypoventilation due to increased dead space 4) Unintended tracheal lavage from condensate

Correct AnswerverifiedShow Answer

The greater the temperature of the gas, the:

Correct AnswerverifiedShow Answer

All mist tents prevent CO2 build-up by what process?

Correct AnswerverifiedShow Answer

Which of the following measures can help to ensure a good sputum sample?

Correct AnswerverifiedShow Answer

Administration of dry gases at flows exceeding 4 L/min can cause which of the following? 1) Structural damage 2) Heat loss 3) Water loss

Correct AnswerverifiedShow Answer

What is the most reliable indicator that the gas delivered by a servo-controlled heated-wire humidifier system is fully saturated at the airway?

Correct AnswerverifiedShow Answer

Which of the following factors cause the isothermic saturation boundary (ISB) to shift farther down into the airways? 1) Decreased ambient temperature 2) Increased tidal volume (VT) 3) Endotracheal intubation

Correct AnswerverifiedShow Answer

How often should heat and moisture exchangers be inspected and replaced?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

All mist tents prevent CO₂ build-up by what process?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following factors cause the isothermic saturation boundary (ISB) to shift farther down into the airways? 1) Decreased ambient temperature 2) Increased tidal volume (V_T) 3) Endotracheal intubation

Correct Answer
verified

Correct Answer
verified