Critical Care Nursing Mastery: Advanced Bundle Exam
Prep & Clinical Decision-Making Questions
Subject: Advanced Hemodynamic Monitoring, Mechanical Ventilation, and
Multi-System Critical Care
Question 1: A patient with septic shock is receiving norepinephrine at 0.2 mcg/kg/min. Despite
fluid resuscitation, the patient’s CVP is 14 mmHg, but the Cardiac Index (CI) remains 1.9
L/min/m² with a MAP of 60 mmHg. Which adjunctive therapy is most physiologically
appropriate to improve oxygen delivery ($DO_2$)?
A) Increase the rate of norepinephrine to further elevate SVR
B) Initiate a low-dose dobutamine infusion to increase contractility
C) Administer a rapid bolus of 500 mL of 5% albumin
D) Transition the patient to phenylephrine to optimize systemic perfusion
Correct Answer: B) Initiate a low-dose dobutamine infusion to increase contractility
Explanation: The patient’s CI is below the critical threshold of 2.2 L/min/m², and the CVP is
already elevated (14 mmHg), suggesting that fluid loading (Option C) would be ineffective and
potentially harmful. Norepinephrine is already providing vasoconstriction; adding an inotrope
like dobutamine addresses the depressed myocardial contractility often seen in septic
cardiomyopathy, thereby improving cardiac output and $DO_2$.
Question 2: In a patient with ARDS, you are using the ARDSNet protocol for low tidal volume
ventilation. The patient’s predicted body weight (PBW) indicates a tidal volume limit of 420 mL.
If the patient's plateau pressure is 35 cmH₂O, what is the most appropriate ventilator adjustment?
A) Increase PEEP to 15 cmH₂O
B) Decrease tidal volume to 350 mL
C) Increase the respiratory rate to 30 breaths/min
D) Switch to high-frequency oscillatory ventilation (HFOV)
Correct Answer: B) Decrease tidal volume to 350 mL
Explanation: The ARDSNet protocol mandates a plateau pressure limit of 30 cmH₂O. Because
this patient’s plateau pressure is 35 cmH₂O, the volume must be decreased (by 1 mL/kg steps) to
minimize ventilator-induced lung injury, provided the volume does not fall below 4 mL/kg/PBW.
Increasing PEEP would likely further raise the plateau pressure.
,Question 3: A patient with a subarachnoid hemorrhage (SAH) and a ventriculostomy drain
begins to exhibit signs of hypothalamic dysfunction, including a sudden rise in temperature and
development of diabetes insipidus. Which laboratory finding most strongly supports the
diagnosis of central diabetes insipidus?
A) Serum sodium 132 mEq/L, Urine specific gravity 1.002
B) Serum sodium 152 mEq/L, Urine specific gravity 1.001
C) Serum sodium 152 mEq/L, Urine osmolality 900 mOsm/kg
D) Serum sodium 132 mEq/L, Urine osmolality 100 mOsm/kg
Correct Answer: B) Serum sodium 152 mEq/L, Urine specific gravity 1.001
Explanation: Central DI results from a failure of ADH secretion, leading to the excretion of
massive amounts of dilute urine. This leads to profound free water loss, causing hypernatremia
(serum sodium > 145) and an inappropriately dilute urine (very low specific gravity < 1.005 and
low osmolality). Options with low sodium are consistent with SIADH or over-hydration.
Question 4: Which of the following hemodynamic changes is the earliest indicator of cardiac
tamponade in a patient following cardiothoracic surgery?
A) Disappearance of the dicrotic notch on the arterial waveform
B) Development of pulsus paradoxus
C) Elevation and equalization of intracardiac pressures (CVP, RAP, PAD, PAWP)
D) Sudden decrease in heart rate
Correct Answer: C) Elevation and equalization of intracardiac pressures (CVP, RAP, PAD,
PAWP)
Explanation: The hallmark of cardiac tamponade is the restriction of ventricular filling due to
pericardial effusion. As the effusion increases, the pressures in all chambers begin to rise and
eventually equalize (typically within 3–5 mmHg of each other), which is a more sensitive early
sign than the clinical appearance of pulsus paradoxus.
Question 5: A patient with acute pancreatitis requires nutritional support. Which strategy is
associated with the lowest rate of infectious complications?
A) Total Parenteral Nutrition (TPN) initiated within 24 hours
B) Enteral nutrition delivered to the stomach
,C) Early enteral nutrition delivered via a post-pyloric feeding tube
D) Strict NPO status until serum amylase levels normalize
Correct Answer: C) Early enteral nutrition delivered via a post-pyloric feeding tube
Explanation: Evidence strongly supports early enteral nutrition (EN) in severe pancreatitis to
maintain gut integrity and prevent bacterial translocation. Post-pyloric feeding is preferred to
avoid triggering pancreatic exocrine secretion, and EN is significantly superior to TPN, which is
associated with higher infection rates.
Question 6: You are titrating propofol for a patient with a TBI. You notice the patient’s
triglyceride levels are 650 mg/dL. What is the priority nursing concern?
A) Development of propofol infusion syndrome
B) Increased risk of pancreatitis
C) Reduced efficacy of sedation
D) Need for immediate hypertonic saline administration
Correct Answer: B) Increased risk of pancreatitis
Explanation: Propofol is prepared in a lipid emulsion. Hypertriglyceridemia is a known side
effect of prolonged or high-dose propofol therapy, which increases the risk of acute pancreatitis.
While propofol infusion syndrome (PRIS) is a risk, it is defined by metabolic acidosis,
rhabdomyolysis, and cardiac failure, not merely elevated triglycerides.
Question 7: A patient with suspected HIT develops a new clot. You are preparing to start
Argatroban. Which lab value is most critical to check prior to the initial bolus/infusion?
A) Serum creatinine
B) International Normalized Ratio (INR)
C) Platelet count
D) Serum potassium
Correct Answer: B) International Normalized Ratio (INR)
Explanation: Argatroban is a direct thrombin inhibitor that is cleared by the liver. It
significantly affects the INR. A baseline INR is mandatory because Argatroban can elevate the
INR to 2.0–3.0 or higher, making it difficult to transition the patient to warfarin later.
, Question 8: A patient on a ventilator displays "asynchronous" breathing, where the patient
attempts to inhale while the ventilator is exhaling. Which setting adjustment is most likely to
reduce this dyssynchrony?
A) Increasing the inspiratory time (Ti)
B) Increasing the flow rate or decreasing the inspiratory rise time
C) Decreasing the pressure support level
D) Increasing the tidal volume
Correct Answer: B) Increasing the flow rate or decreasing the inspiratory rise time
Explanation: Flow-asynchrony often occurs when the ventilator's inspiratory flow rate is
insufficient to meet the patient’s demand. Increasing the flow rate (or reducing rise time in
pressure-targeted modes) allows the ventilator to deliver gas faster, matching the patient’s peak
inspiratory demand.
Question 9: Which of the following ECG changes is pathognomonic for a left main coronary
artery occlusion?
A) ST elevation in V1 and aVR with diffuse ST depression
B) ST elevation in leads II, III, and aVF
C) Deep Q waves in leads V4-V6
D) ST elevation in V2-V4 with Q waves
Correct Answer: A) ST elevation in V1 and aVR with diffuse ST depression
Explanation: Occlusion of the left main coronary artery is catastrophic. It typically manifests as
ST elevation in lead aVR (reflecting ischemia to the basal septum/outflow tract) and lead V1,
combined with widespread ST-segment depression in the remaining leads due to subendocardial
ischemia.
Question 10: In a patient with severe ARDS, how does the application of "prone positioning"
improve oxygenation?
A) It increases the total functional residual capacity of the lungs
B) It shifts blood flow from the dorsal (dependent) regions to the ventral (non-dependent)
regions, reducing shunt
C) It allows for more effective suctioning of posterior secretions
Prep & Clinical Decision-Making Questions
Subject: Advanced Hemodynamic Monitoring, Mechanical Ventilation, and
Multi-System Critical Care
Question 1: A patient with septic shock is receiving norepinephrine at 0.2 mcg/kg/min. Despite
fluid resuscitation, the patient’s CVP is 14 mmHg, but the Cardiac Index (CI) remains 1.9
L/min/m² with a MAP of 60 mmHg. Which adjunctive therapy is most physiologically
appropriate to improve oxygen delivery ($DO_2$)?
A) Increase the rate of norepinephrine to further elevate SVR
B) Initiate a low-dose dobutamine infusion to increase contractility
C) Administer a rapid bolus of 500 mL of 5% albumin
D) Transition the patient to phenylephrine to optimize systemic perfusion
Correct Answer: B) Initiate a low-dose dobutamine infusion to increase contractility
Explanation: The patient’s CI is below the critical threshold of 2.2 L/min/m², and the CVP is
already elevated (14 mmHg), suggesting that fluid loading (Option C) would be ineffective and
potentially harmful. Norepinephrine is already providing vasoconstriction; adding an inotrope
like dobutamine addresses the depressed myocardial contractility often seen in septic
cardiomyopathy, thereby improving cardiac output and $DO_2$.
Question 2: In a patient with ARDS, you are using the ARDSNet protocol for low tidal volume
ventilation. The patient’s predicted body weight (PBW) indicates a tidal volume limit of 420 mL.
If the patient's plateau pressure is 35 cmH₂O, what is the most appropriate ventilator adjustment?
A) Increase PEEP to 15 cmH₂O
B) Decrease tidal volume to 350 mL
C) Increase the respiratory rate to 30 breaths/min
D) Switch to high-frequency oscillatory ventilation (HFOV)
Correct Answer: B) Decrease tidal volume to 350 mL
Explanation: The ARDSNet protocol mandates a plateau pressure limit of 30 cmH₂O. Because
this patient’s plateau pressure is 35 cmH₂O, the volume must be decreased (by 1 mL/kg steps) to
minimize ventilator-induced lung injury, provided the volume does not fall below 4 mL/kg/PBW.
Increasing PEEP would likely further raise the plateau pressure.
,Question 3: A patient with a subarachnoid hemorrhage (SAH) and a ventriculostomy drain
begins to exhibit signs of hypothalamic dysfunction, including a sudden rise in temperature and
development of diabetes insipidus. Which laboratory finding most strongly supports the
diagnosis of central diabetes insipidus?
A) Serum sodium 132 mEq/L, Urine specific gravity 1.002
B) Serum sodium 152 mEq/L, Urine specific gravity 1.001
C) Serum sodium 152 mEq/L, Urine osmolality 900 mOsm/kg
D) Serum sodium 132 mEq/L, Urine osmolality 100 mOsm/kg
Correct Answer: B) Serum sodium 152 mEq/L, Urine specific gravity 1.001
Explanation: Central DI results from a failure of ADH secretion, leading to the excretion of
massive amounts of dilute urine. This leads to profound free water loss, causing hypernatremia
(serum sodium > 145) and an inappropriately dilute urine (very low specific gravity < 1.005 and
low osmolality). Options with low sodium are consistent with SIADH or over-hydration.
Question 4: Which of the following hemodynamic changes is the earliest indicator of cardiac
tamponade in a patient following cardiothoracic surgery?
A) Disappearance of the dicrotic notch on the arterial waveform
B) Development of pulsus paradoxus
C) Elevation and equalization of intracardiac pressures (CVP, RAP, PAD, PAWP)
D) Sudden decrease in heart rate
Correct Answer: C) Elevation and equalization of intracardiac pressures (CVP, RAP, PAD,
PAWP)
Explanation: The hallmark of cardiac tamponade is the restriction of ventricular filling due to
pericardial effusion. As the effusion increases, the pressures in all chambers begin to rise and
eventually equalize (typically within 3–5 mmHg of each other), which is a more sensitive early
sign than the clinical appearance of pulsus paradoxus.
Question 5: A patient with acute pancreatitis requires nutritional support. Which strategy is
associated with the lowest rate of infectious complications?
A) Total Parenteral Nutrition (TPN) initiated within 24 hours
B) Enteral nutrition delivered to the stomach
,C) Early enteral nutrition delivered via a post-pyloric feeding tube
D) Strict NPO status until serum amylase levels normalize
Correct Answer: C) Early enteral nutrition delivered via a post-pyloric feeding tube
Explanation: Evidence strongly supports early enteral nutrition (EN) in severe pancreatitis to
maintain gut integrity and prevent bacterial translocation. Post-pyloric feeding is preferred to
avoid triggering pancreatic exocrine secretion, and EN is significantly superior to TPN, which is
associated with higher infection rates.
Question 6: You are titrating propofol for a patient with a TBI. You notice the patient’s
triglyceride levels are 650 mg/dL. What is the priority nursing concern?
A) Development of propofol infusion syndrome
B) Increased risk of pancreatitis
C) Reduced efficacy of sedation
D) Need for immediate hypertonic saline administration
Correct Answer: B) Increased risk of pancreatitis
Explanation: Propofol is prepared in a lipid emulsion. Hypertriglyceridemia is a known side
effect of prolonged or high-dose propofol therapy, which increases the risk of acute pancreatitis.
While propofol infusion syndrome (PRIS) is a risk, it is defined by metabolic acidosis,
rhabdomyolysis, and cardiac failure, not merely elevated triglycerides.
Question 7: A patient with suspected HIT develops a new clot. You are preparing to start
Argatroban. Which lab value is most critical to check prior to the initial bolus/infusion?
A) Serum creatinine
B) International Normalized Ratio (INR)
C) Platelet count
D) Serum potassium
Correct Answer: B) International Normalized Ratio (INR)
Explanation: Argatroban is a direct thrombin inhibitor that is cleared by the liver. It
significantly affects the INR. A baseline INR is mandatory because Argatroban can elevate the
INR to 2.0–3.0 or higher, making it difficult to transition the patient to warfarin later.
, Question 8: A patient on a ventilator displays "asynchronous" breathing, where the patient
attempts to inhale while the ventilator is exhaling. Which setting adjustment is most likely to
reduce this dyssynchrony?
A) Increasing the inspiratory time (Ti)
B) Increasing the flow rate or decreasing the inspiratory rise time
C) Decreasing the pressure support level
D) Increasing the tidal volume
Correct Answer: B) Increasing the flow rate or decreasing the inspiratory rise time
Explanation: Flow-asynchrony often occurs when the ventilator's inspiratory flow rate is
insufficient to meet the patient’s demand. Increasing the flow rate (or reducing rise time in
pressure-targeted modes) allows the ventilator to deliver gas faster, matching the patient’s peak
inspiratory demand.
Question 9: Which of the following ECG changes is pathognomonic for a left main coronary
artery occlusion?
A) ST elevation in V1 and aVR with diffuse ST depression
B) ST elevation in leads II, III, and aVF
C) Deep Q waves in leads V4-V6
D) ST elevation in V2-V4 with Q waves
Correct Answer: A) ST elevation in V1 and aVR with diffuse ST depression
Explanation: Occlusion of the left main coronary artery is catastrophic. It typically manifests as
ST elevation in lead aVR (reflecting ischemia to the basal septum/outflow tract) and lead V1,
combined with widespread ST-segment depression in the remaining leads due to subendocardial
ischemia.
Question 10: In a patient with severe ARDS, how does the application of "prone positioning"
improve oxygenation?
A) It increases the total functional residual capacity of the lungs
B) It shifts blood flow from the dorsal (dependent) regions to the ventral (non-dependent)
regions, reducing shunt
C) It allows for more effective suctioning of posterior secretions
