CCRN Adult Critical Care
Certification (122 Questions)
---
*QUESTION 1:*
A 65-year-old patient with acute respiratory distress syndrome (ARDS) is on mechanical ventilation with
a PaO2/FiO2 ratio of 150. Which intervention is most appropriate?
A) Increase FiO2 to 100%
B) Initiate prone positioning
C) Administer a neuromuscular blocker
D) Increase PEEP to 20 cm H2O
> 🎯 *CORRECT ANSWER:* B) Initiate prone positioning
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Prone positioning improves oxygenation in severe ARDS (PaO2/FiO2 < 150).
> * *Why Distractors Fail:* Increasing FiO2 to 100% increases toxicity; PEEP > 15 is cautious.
> * *Core Takeaway:* Prone positioning is recommended for severe ARDS.
---
*QUESTION 2:*
A 72-year-old patient with heart failure is receiving a continuous infusion of dobutamine. What is the
primary mechanism of action of this medication?
A) Increases cardiac contractility and stroke volume
B) Causes peripheral vasodilation to reduce afterload
C) Increases heart rate to improve cardiac output
,D) Reduces preload by increasing venous capacitance
> 🎯 *CORRECT ANSWER:* A) Increases cardiac contractility and stroke volume
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Dobutamine is a beta-1 agonist that increases contractility.
> * *Why Distractors Fail:* It has mild vasodilatory effects but primarily affects contractility.
> * *Core Takeaway:* Dobutamine is an inotropic agent.
---
*QUESTION 3:*
A 58-year-old patient with sepsis has a central venous oxygen saturation (ScvO2) of 55%. What
intervention should the nurse anticipate?
A) Administer a fluid bolus
B) Transfuse packed red blood cells
C) Initiate norepinephrine
D) Administer dobutamine
> 🎯 *CORRECT ANSWER:* A) Administer a fluid bolus
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Low ScvO2 (<70%) indicates inadequate oxygen delivery; fluid is first-line.
> * *Why Distractors Fail:* Transfusion is considered if Hgb < 7; dobutamine if fluid and transfusion fail.
> * *Core Takeaway:* Optimize preload with fluids in sepsis.
---
*QUESTION 4:*
A patient with an intracranial hemorrhage has an ICP of 25 mmHg and a CPP of 50 mmHg. What is the
priority intervention?
A) Administer mannitol
,B) Elevate the head of the bed to 30 degrees
C) Administer a fluid bolus
D) Hyperventilate to a PaCO2 of 30 mmHg
> 🎯 *CORRECT ANSWER:* A) Administer mannitol
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* ICP > 20 requires intervention; mannitol reduces ICP.
> * *Why Distractors Fail:* Hyperventilation is for refractory ICP; fluid bolus may increase ICP.
> * *Core Takeaway:* Mannitol is first-line for elevated ICP.
---
*QUESTION 5:*
A patient with acute kidney injury has a serum potassium of 6.8 mEq/L. What ECG change is most
concerning?
A) Peaked T waves
B) Widened QRS complex
C) Prolonged PR interval
D) U waves
> 🎯 *CORRECT ANSWER:* B) Widened QRS complex
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Widened QRS indicates severe hyperkalemia and risk of VT/VF.
> * *Why Distractors Fail:* Peaked T waves occur earlier; U waves are for hypokalemia.
> * *Core Takeaway:* Widened QRS is a critical finding in hyperkalemia.
---
*QUESTION 6:*
, A 68-year-old patient is in cardiogenic shock after an acute myocardial infarction. Which medication is
most appropriate?
A) Norepinephrine
B) Dobutamine
C) Epinephrine
D) Phenylephrine
> 🎯 *CORRECT ANSWER:* B) Dobutamine
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Dobutamine improves contractility and cardiac output.
> * *Why Distractors Fail:* Norepinephrine is for vasodilatory shock; phenylephrine is pure
vasoconstrictor.
> * *Core Takeaway:* Dobutamine is the first-line inotrope for cardiogenic shock.
---
*QUESTION 7:*
A 62-year-old patient with COPD is on mechanical ventilation. The arterial blood gas shows a pH of 7.31,
PaCO2 of 58 mmHg, and HCO3 of 26 mEq/L. What is the interpretation?
A) Acute respiratory acidosis with metabolic compensation
B) Acute respiratory alkalosis
C) Chronic respiratory acidosis with metabolic compensation
D) Metabolic acidosis with respiratory compensation
> 🎯 *CORRECT ANSWER:* A) Acute respiratory acidosis with metabolic compensation
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* High PaCO2, low pH, and normal HCO3 indicate acute respiratory acidosis.
> * *Why Distractors Fail:* Chronic acidosis would have elevated HCO3.
> * *Core Takeaway:* Acute respiratory acidosis is present.
Certification (122 Questions)
---
*QUESTION 1:*
A 65-year-old patient with acute respiratory distress syndrome (ARDS) is on mechanical ventilation with
a PaO2/FiO2 ratio of 150. Which intervention is most appropriate?
A) Increase FiO2 to 100%
B) Initiate prone positioning
C) Administer a neuromuscular blocker
D) Increase PEEP to 20 cm H2O
> 🎯 *CORRECT ANSWER:* B) Initiate prone positioning
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Prone positioning improves oxygenation in severe ARDS (PaO2/FiO2 < 150).
> * *Why Distractors Fail:* Increasing FiO2 to 100% increases toxicity; PEEP > 15 is cautious.
> * *Core Takeaway:* Prone positioning is recommended for severe ARDS.
---
*QUESTION 2:*
A 72-year-old patient with heart failure is receiving a continuous infusion of dobutamine. What is the
primary mechanism of action of this medication?
A) Increases cardiac contractility and stroke volume
B) Causes peripheral vasodilation to reduce afterload
C) Increases heart rate to improve cardiac output
,D) Reduces preload by increasing venous capacitance
> 🎯 *CORRECT ANSWER:* A) Increases cardiac contractility and stroke volume
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Dobutamine is a beta-1 agonist that increases contractility.
> * *Why Distractors Fail:* It has mild vasodilatory effects but primarily affects contractility.
> * *Core Takeaway:* Dobutamine is an inotropic agent.
---
*QUESTION 3:*
A 58-year-old patient with sepsis has a central venous oxygen saturation (ScvO2) of 55%. What
intervention should the nurse anticipate?
A) Administer a fluid bolus
B) Transfuse packed red blood cells
C) Initiate norepinephrine
D) Administer dobutamine
> 🎯 *CORRECT ANSWER:* A) Administer a fluid bolus
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Low ScvO2 (<70%) indicates inadequate oxygen delivery; fluid is first-line.
> * *Why Distractors Fail:* Transfusion is considered if Hgb < 7; dobutamine if fluid and transfusion fail.
> * *Core Takeaway:* Optimize preload with fluids in sepsis.
---
*QUESTION 4:*
A patient with an intracranial hemorrhage has an ICP of 25 mmHg and a CPP of 50 mmHg. What is the
priority intervention?
A) Administer mannitol
,B) Elevate the head of the bed to 30 degrees
C) Administer a fluid bolus
D) Hyperventilate to a PaCO2 of 30 mmHg
> 🎯 *CORRECT ANSWER:* A) Administer mannitol
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* ICP > 20 requires intervention; mannitol reduces ICP.
> * *Why Distractors Fail:* Hyperventilation is for refractory ICP; fluid bolus may increase ICP.
> * *Core Takeaway:* Mannitol is first-line for elevated ICP.
---
*QUESTION 5:*
A patient with acute kidney injury has a serum potassium of 6.8 mEq/L. What ECG change is most
concerning?
A) Peaked T waves
B) Widened QRS complex
C) Prolonged PR interval
D) U waves
> 🎯 *CORRECT ANSWER:* B) Widened QRS complex
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Widened QRS indicates severe hyperkalemia and risk of VT/VF.
> * *Why Distractors Fail:* Peaked T waves occur earlier; U waves are for hypokalemia.
> * *Core Takeaway:* Widened QRS is a critical finding in hyperkalemia.
---
*QUESTION 6:*
, A 68-year-old patient is in cardiogenic shock after an acute myocardial infarction. Which medication is
most appropriate?
A) Norepinephrine
B) Dobutamine
C) Epinephrine
D) Phenylephrine
> 🎯 *CORRECT ANSWER:* B) Dobutamine
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* Dobutamine improves contractility and cardiac output.
> * *Why Distractors Fail:* Norepinephrine is for vasodilatory shock; phenylephrine is pure
vasoconstrictor.
> * *Core Takeaway:* Dobutamine is the first-line inotrope for cardiogenic shock.
---
*QUESTION 7:*
A 62-year-old patient with COPD is on mechanical ventilation. The arterial blood gas shows a pH of 7.31,
PaCO2 of 58 mmHg, and HCO3 of 26 mEq/L. What is the interpretation?
A) Acute respiratory acidosis with metabolic compensation
B) Acute respiratory alkalosis
C) Chronic respiratory acidosis with metabolic compensation
D) Metabolic acidosis with respiratory compensation
> 🎯 *CORRECT ANSWER:* A) Acute respiratory acidosis with metabolic compensation
> 💡 *CLINICAL RATIONALE:*
> * *Why It's Right:* High PaCO2, low pH, and normal HCO3 indicate acute respiratory acidosis.
> * *Why Distractors Fail:* Chronic acidosis would have elevated HCO3.
> * *Core Takeaway:* Acute respiratory acidosis is present.
