CCRN Acute Respiratory Failure 3

Question 1

By the Berlin definition, ARDS is characterized by bilateral infiltrates and a PaO2/FiO2 ratio of:

Accepted Answer

≤ 300 mmHg with PEEP ≥ 5

Answer

ARDS requires a P/F ratio ≤ 300 with at least 5 cm H2O of PEEP or CPAP.

Question 2

The Berlin criteria require that ARDS-related respiratory failure is NOT fully explained by:

Accepted Answer

Cardiac failure or fluid overload

Answer

Hydrostatic edema from cardiac failure or volume overload must be excluded as the primary cause.

Question 3

Which lung-protective tidal volume target is recommended for a patient with ARDS?

Accepted Answer

6 mL/kg of predicted body weight

Answer

Low tidal volume ventilation at 6 mL/kg predicted body weight reduces ventilator-induced lung injury.

Question 4

In ARDS lung-protective ventilation, plateau pressure should generally be kept below:

Accepted Answer

30 cm H2O

Answer

Keeping plateau pressure < 30 cm H2O limits alveolar overdistension and barotrauma.

Question 5

Which positioning intervention improves oxygenation and mortality in moderate-to-severe ARDS?

Accepted Answer

Prone positioning

Answer

Prone positioning improves V/Q matching and recruits dorsal lung regions, reducing mortality in severe ARDS.

CCRN Review Practice Test