Which of the following equipment is most helpful at measuring FRC in a patient who has
significant non-ventilated lung spaces?
A. nitrogen analyzer for a nitrogen washout test
B. helium analyzer for a helium dilution
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Which of the following equipment is most helpful at measuring FRC in a patient who has
significant non-ventilated lung spaces?
A. nitrogen analyzer for a nitrogen washout test
B. helium analyzer for a helium dilution test
C. plethysmograph
D. peak flow meter - ✔✔The correct answer is : C
Explanation : You can determine FRC in three different ways - body box, nitrogen
washout, or helium dilution. If someone has non-ventilated lung space, nitrogen
washout and helium dilution are not helpful and may be inaccurate. FRC determined by
body box will be higher because it can access non-ventilated lung space and therefore
is more accurate.
The respiratory therapist is making a home visit to evaluate an oxygen-dependent
patient. The patient has 3+ pitting peripheral edema and has not followed the
physician's orders to limit fluid intake. You would expect which of the following
hemodynamic values?
A. elevated PCWP with a low cardiac output
B. low mean arterial pressure
C. elevated right sided preload with a normal to low right ventricular after load
D. reduced cardiac index - ✔✔The correct answer is : C
Explanation : Right-sided preload is another name for CVP (central venous pressure).
Peripheral edema is one of the signs associated with right heart failure, which results in
an elevated CVP with a normal or low pulmonary artery pressure (PAP), a.k.a. right
ventricular afterload.
A ventilator-dependent patient is scheduled for an MRI, which will require a transport of
90 minutes. The patient is receiving humidification with a heated- humidification system.
A transport ventilator is available. How should a respiratory therapist assure that
humidification will be provided to the patient during the MRI procedure?
A. Provide a pass-over humidifier
B. Provide an HME
C. Provide ventilation with a manual resuscitator
D. Use the same humidification system in use on the primary ventilator - ✔✔The
correct answer is : B
Explanation : A heat moisture exchanger (HME) is appropriate for a transport of only 90
min. Furthermore, the scenario does not suggest that the patient has thick, retained
secretions, therefore an HME may be applied.
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