TMC PRACTICE EXAM 25 QUESTIONS
#1 AND ANSWERS 2025
, Which of the following equipment is most helpful at measuring FRC in a patient who has
significant non-ventilated lung spaces? - ANSWERplethysmograph
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
dilutionn 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? - ANSWERelevated right sided preload with a normal to low right
ventricular after load
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? -
ANSWERProvide an HME
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.
which of the following can accurately be stated about a widening alveolar-arterial
oxygen gradient? - ANSWERincreased intrapulmonary shunting
A normal alveolar arterial oxygen gradient is below 65 mmHg. When that gradient rises
to 200, 300, 400, or more, then you have what is called shunting. If the A-a gradient is
less than 300 it's technically called a ventilation perfusion (VQ) mismatch. But generally
speaking, as the gradient widens it can properly be said that there is an increase in
pulmonary shunting.
How many hours will an H cylinder with 1400 psi last for a patient receiving oxygen at 7
lpm? - ANSWER10hrs
And H cylinder has a tank factor of 3.14. 3.14x1400 PSI = 4396 L. 4396 L / 7 L per
minute = 628 min. 628 min./ 60 min.= 10.4 hours, or about 10 hours. When you get an
#1 AND ANSWERS 2025
, Which of the following equipment is most helpful at measuring FRC in a patient who has
significant non-ventilated lung spaces? - ANSWERplethysmograph
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
dilutionn 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? - ANSWERelevated right sided preload with a normal to low right
ventricular after load
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? -
ANSWERProvide an HME
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.
which of the following can accurately be stated about a widening alveolar-arterial
oxygen gradient? - ANSWERincreased intrapulmonary shunting
A normal alveolar arterial oxygen gradient is below 65 mmHg. When that gradient rises
to 200, 300, 400, or more, then you have what is called shunting. If the A-a gradient is
less than 300 it's technically called a ventilation perfusion (VQ) mismatch. But generally
speaking, as the gradient widens it can properly be said that there is an increase in
pulmonary shunting.
How many hours will an H cylinder with 1400 psi last for a patient receiving oxygen at 7
lpm? - ANSWER10hrs
And H cylinder has a tank factor of 3.14. 3.14x1400 PSI = 4396 L. 4396 L / 7 L per
minute = 628 min. 628 min./ 60 min.= 10.4 hours, or about 10 hours. When you get an
