RRT RRT 5

Question 1

Which of the following correctly describes high-frequency oscillatory ventilation (HFOV)?

Accepted Answer

Uses tidal volumes smaller than anatomical dead space at very high frequencies

Answer

HFOV delivers very small tidal volumes (1-3 mL/kg) at frequencies of 3-15 Hz, keeping mean airway pressure constant while oscillating around it.

Question 2

A patient with suspected pulmonary embolism has which of the following MOST typical ABG findings?

Accepted Answer

Hypoxemia with respiratory alkalosis (low PaCO2)

Answer

PE typically causes hypoxemia from V/Q mismatch and reflexive hyperventilation leading to low PaCO2 and respiratory alkalosis.

Question 3

Which of the following is the MOST effective method to confirm correct endotracheal tube placement after intubation?

Accepted Answer

Continuous waveform capnography

Answer

Continuous waveform capnography (ETCO2) with a consistent rectangular waveform is the gold standard for confirming and monitoring ETT placement.

Question 4

When performing a helium dilution test for measuring functional residual capacity (FRC), what is the underlying principle?

Accepted Answer

A known concentration of helium equilibrates with lung gas allowing calculation of FRC

Answer

In helium dilution, a known amount of helium equilibrates between the spirometer and lungs; the final diluted concentration allows FRC calculation via conservation of mass.

Question 5

Which condition is MOST likely to cause a decreased diffusing capacity (DLCO)?

Accepted Answer

Pulmonary fibrosis

Answer

Pulmonary fibrosis thickens the alveolar-capillary membrane, impairing gas diffusion and reducing DLCO.

RRT Exam Practice Test

RRT Exam Practice Test

RRT RRT 5