NR 571 Complex Diagnosis & Management in Acute
Care Practicum | Chamberlain University NR571
Study Guide & Exam Prep 2026/2027 | Adult-
Gerontology Acute Care Nurse Practitioner Review,
Complex Acute Care Diagnosis, Advanced Patient
Assessment, Differential Diagnosis, Diagnostic
Testing & Interpretation, Cardiovascular &
Pulmonary Conditions, Neurological, Renal,
Endocrine, GI & Multisystem Disorders,
Pharmacologic Management, Clinical Reasoning,
Patient Safety, Practice Questions, Answers &
Detailed Rationales
Question 1: A 68-year-old male with a history of hypertension and type 2
diabetes presents with acute onset of severe, tearing chest pain radiating to his
back. His blood pressure is 180/110 mmHg in the right arm and 140/90 mmHg
in the left arm. Which of the following is the most appropriate initial imaging
study to confirm the suspected diagnosis?
A. Transthoracic Echocardiogram
B. Computed Tomography Angiography (CTA)
C. Magnetic Resonance Angiography (MRA)
D. Standard Chest X-Ray
CORRECT ANSWER: B. Computed Tomography Angiography (CTA)
Rationale: The presentation suggests an acute aortic dissection. CTA of the chest and
abdomen is the preferred initial imaging modality due to its high sensitivity and
specificity, rapid acquisition, and widespread availability. It accurately defines the extent
of the dissection and involvement of branch vessels, which is critical for surgical
planning. While MRA is also accurate, it is less available and takes longer. Chest X-ray is
insensitive, and a TTE is not reliable for ruling out a dissection.
Question 2: A 55-year-old female with a history of cirrhosis presents with
confusion, asterixis, and jaundice. Her ammonia level is elevated. What is the
primary pathophysiological mechanism leading to her neurologic symptoms?
A. Accumulation of aromatic amino acids
B. Increased permeability of the blood-brain barrier to glutamine
C. Direct neurotoxicity of ammonia leading to astrocyte swelling
D. Depletion of gamma-aminobutyric acid (GABA) in the brain
CORRECT ANSWER: C. Direct neurotoxicity of ammonia leading to astrocyte
swelling
Rationale: In hepatic encephalopathy, elevated ammonia (NH3) crosses the blood-brain
barrier and is taken up by astrocytes. It is converted to glutamine, which acts as an
,osmolyte, leading to astrocyte swelling and cerebral edema. This causes the neurologic
dysfunction seen in hepatic encephalopathy. While GABA-ergic tone may be increased,
it is not the primary mechanism. Aromatic amino acid accumulation contributes to false
neurotransmitters, but astrocyte swelling is the central driver of symptoms.
Question 3: A 72-year-old male with a history of COPD is brought to the ICU
with acute respiratory failure. He is intubated and placed on volume-
controlled ventilation. Which of the following ventilator settings is most likely
to cause dynamic hyperinflation (auto-PEEP) in this patient?
A. Tidal Volume 6 mL/kg, Respiratory Rate 12 breaths/min
B. Tidal Volume 8 mL/kg, Respiratory Rate 14 breaths/min
C. Tidal Volume 6 mL/kg, Respiratory Rate 20 breaths/min
D. Tidal Volume 10 mL/kg, Respiratory Rate 10 breaths/min
CORRECT ANSWER: C. Tidal Volume 6 mL/kg, Respiratory Rate 20
breaths/min
Rationale: Patients with COPD have prolonged expiratory time constants due to
increased airway resistance. A high respiratory rate (e.g., 20 breaths/min) results in a
short expiratory time, preventing complete exhalation before the next breath. This leads
to air trapping and intrinsic PEEP (auto-PEEP). Lower tidal volumes and rates are
protective. A high rate is the primary driver of auto-PEEP in this scenario.
Question 4: A 45-year-old female with systemic lupus erythematosus presents
with acute pleuritic chest pain and shortness of breath. Her D-dimer is
elevated. Which of the following diagnostic tests is most specific for
confirming a pulmonary embolism in this patient?
A. CT Pulmonary Angiography (CTPA)
B. Ventilation-Perfusion (V/Q) Scan
C. Pulmonary Angiography
D. Transthoracic Echocardiogram
CORRECT ANSWER: A. CT Pulmonary Angiography (CTPA)
Rationale: CTPA is the first-line diagnostic imaging for suspected pulmonary embolism
due to its high specificity and sensitivity, especially in patients with a high pre-test
probability. It can identify thrombi in the pulmonary arteries. While pulmonary
angiography is the historical gold standard, it is invasive and rarely used. A V/Q scan
may be used if CTPA is contraindicated, but it has lower specificity, particularly in
patients with underlying lung disease like SLE.
Question 5: A 60-year-old male with a history of coronary artery disease
presents with acute substernal chest pain that is unrelieved by nitroglycerin.
His ECG shows ST-segment elevation in leads V1-V4. Which of the following is
the most appropriate immediate reperfusion strategy if the patient presents 3
hours after symptom onset?
,A. Immediate administration of tenecteplase
B. Urgent coronary artery bypass grafting (CABG)
C. Percutaneous coronary intervention (PCI)
D. High-dose intravenous heparin alone
CORRECT ANSWER: C. Percutaneous coronary intervention (PCI)
Rationale: For a patient with an ST-segment elevation myocardial infarction (STEMI)
presenting within 12 hours, the preferred reperfusion strategy is primary PCI if it can be
performed within 90-120 minutes of first medical contact. In this case, the patient is
within the time window, and PCI is superior to fibrinolysis in terms of mortality and re-
infarction. Fibrinolysis is an alternative if PCI is not available.
Question 6: A 28-year-old male is admitted with a severe asthma exacerbation.
His peak expiratory flow rate is 30% of predicted. He is using accessory
muscles and is unable to speak in full sentences. Despite continuous nebulized
albuterol and ipratropium, he remains tachypneic. Which of the following
findings would indicate the need for immediate intubation?
A. Heart rate of 110 bpm
B. Oxygen saturation of 90% on 50% FiO2
C. PaCO2 of 50 mmHg with a pH of 7.25
D. Respiratory rate of 28 breaths/min
CORRECT ANSWER: C. PaCO2 of 50 mmHg with a pH of 7.25
Rationale: In severe asthma, a rising PaCO2 with associated acidosis (respiratory
acidosis) is a sign of respiratory muscle fatigue and impending respiratory failure. This is
an ominous sign indicating the need for immediate intubation and mechanical
ventilation. While a low oxygen saturation is concerning, it is not an immediate
indication for intubation if it can be corrected with oxygen.
Question 7: A 65-year-old female with a history of CHF and atrial fibrillation is
admitted with acute decompensated heart failure. She is on a continuous
infusion of furosemide. Which of the following laboratory values is the most
important to monitor to assess the efficacy of the diuretic therapy?
A. Serum Sodium
B. Serum Creatinine
C. Urine Output
D. Serum BNP
CORRECT ANSWER: C. Urine Output
Rationale: In acute decompensated heart failure, the primary goal of diuretic therapy is
to achieve adequate diuresis to reduce volume overload. Monitoring urine output
provides a direct measure of the response to furosemide. While serum creatinine is
important to monitor for renal function, BNP can be delayed in its response, and sodium
, is a secondary concern. Urine output is the most immediate and reliable indicator of
efficacy.
Question 8: A 50-year-old male with a history of alcoholism presents with
acute pancreatitis. His serum lipase is markedly elevated. Which of the
following complications of acute pancreatitis is most likely to present within
the first 48 hours of admission?
A. Pancreatic pseudocyst
B. Acute Respiratory Distress Syndrome (ARDS)
C. Splenic vein thrombosis
D. Chronic pancreatitis
CORRECT ANSWER: B. Acute Respiratory Distress Syndrome (ARDS)
Rationale: ARDS is an early and potentially lethal complication of severe acute
pancreatitis, typically developing within 48 hours due to the systemic inflammatory
response syndrome (SIRS) triggered by the release of pancreatic enzymes and
cytokines. Pancreatic pseudocysts and splenic vein thrombosis are late complications
that usually develop weeks after the initial episode.
Question 9: A 70-year-old male is admitted with a subdural hematoma
following a fall. He is being managed with mannitol for elevated intracranial
pressure (ICP). Which of the following is a primary mechanism of action of
mannitol in reducing ICP?
A. Reducing cerebrospinal fluid production
B. Direct vasodilation of cerebral arteries
C. Creating an osmotic gradient to draw water from brain tissue
D. Decreasing cerebral metabolic rate
CORRECT ANSWER: C. Creating an osmotic gradient to draw water from brain
tissue
Rationale: Mannitol is an osmotic diuretic. Its primary mechanism for lowering ICP is by
increasing plasma osmolarity, which creates an osmotic gradient that draws water from
the brain parenchyma and interstitial spaces into the intravascular space, thereby
reducing cerebral edema and ICP. It also promotes diuresis, which further helps reduce
total body water.
Question 10: A 35-year-old female with a history of migraines presents with a
sudden onset of the worst headache of her life, described as a "thunderclap."
She is nauseous and has a stiff neck. Which of the following is the most
appropriate initial diagnostic test?
A. Non-contrast CT scan of the head
B. Lumbar puncture
C. Magnetic Resonance Angiography (MRA)
D. Electroencephalogram (EEG)
Care Practicum | Chamberlain University NR571
Study Guide & Exam Prep 2026/2027 | Adult-
Gerontology Acute Care Nurse Practitioner Review,
Complex Acute Care Diagnosis, Advanced Patient
Assessment, Differential Diagnosis, Diagnostic
Testing & Interpretation, Cardiovascular &
Pulmonary Conditions, Neurological, Renal,
Endocrine, GI & Multisystem Disorders,
Pharmacologic Management, Clinical Reasoning,
Patient Safety, Practice Questions, Answers &
Detailed Rationales
Question 1: A 68-year-old male with a history of hypertension and type 2
diabetes presents with acute onset of severe, tearing chest pain radiating to his
back. His blood pressure is 180/110 mmHg in the right arm and 140/90 mmHg
in the left arm. Which of the following is the most appropriate initial imaging
study to confirm the suspected diagnosis?
A. Transthoracic Echocardiogram
B. Computed Tomography Angiography (CTA)
C. Magnetic Resonance Angiography (MRA)
D. Standard Chest X-Ray
CORRECT ANSWER: B. Computed Tomography Angiography (CTA)
Rationale: The presentation suggests an acute aortic dissection. CTA of the chest and
abdomen is the preferred initial imaging modality due to its high sensitivity and
specificity, rapid acquisition, and widespread availability. It accurately defines the extent
of the dissection and involvement of branch vessels, which is critical for surgical
planning. While MRA is also accurate, it is less available and takes longer. Chest X-ray is
insensitive, and a TTE is not reliable for ruling out a dissection.
Question 2: A 55-year-old female with a history of cirrhosis presents with
confusion, asterixis, and jaundice. Her ammonia level is elevated. What is the
primary pathophysiological mechanism leading to her neurologic symptoms?
A. Accumulation of aromatic amino acids
B. Increased permeability of the blood-brain barrier to glutamine
C. Direct neurotoxicity of ammonia leading to astrocyte swelling
D. Depletion of gamma-aminobutyric acid (GABA) in the brain
CORRECT ANSWER: C. Direct neurotoxicity of ammonia leading to astrocyte
swelling
Rationale: In hepatic encephalopathy, elevated ammonia (NH3) crosses the blood-brain
barrier and is taken up by astrocytes. It is converted to glutamine, which acts as an
,osmolyte, leading to astrocyte swelling and cerebral edema. This causes the neurologic
dysfunction seen in hepatic encephalopathy. While GABA-ergic tone may be increased,
it is not the primary mechanism. Aromatic amino acid accumulation contributes to false
neurotransmitters, but astrocyte swelling is the central driver of symptoms.
Question 3: A 72-year-old male with a history of COPD is brought to the ICU
with acute respiratory failure. He is intubated and placed on volume-
controlled ventilation. Which of the following ventilator settings is most likely
to cause dynamic hyperinflation (auto-PEEP) in this patient?
A. Tidal Volume 6 mL/kg, Respiratory Rate 12 breaths/min
B. Tidal Volume 8 mL/kg, Respiratory Rate 14 breaths/min
C. Tidal Volume 6 mL/kg, Respiratory Rate 20 breaths/min
D. Tidal Volume 10 mL/kg, Respiratory Rate 10 breaths/min
CORRECT ANSWER: C. Tidal Volume 6 mL/kg, Respiratory Rate 20
breaths/min
Rationale: Patients with COPD have prolonged expiratory time constants due to
increased airway resistance. A high respiratory rate (e.g., 20 breaths/min) results in a
short expiratory time, preventing complete exhalation before the next breath. This leads
to air trapping and intrinsic PEEP (auto-PEEP). Lower tidal volumes and rates are
protective. A high rate is the primary driver of auto-PEEP in this scenario.
Question 4: A 45-year-old female with systemic lupus erythematosus presents
with acute pleuritic chest pain and shortness of breath. Her D-dimer is
elevated. Which of the following diagnostic tests is most specific for
confirming a pulmonary embolism in this patient?
A. CT Pulmonary Angiography (CTPA)
B. Ventilation-Perfusion (V/Q) Scan
C. Pulmonary Angiography
D. Transthoracic Echocardiogram
CORRECT ANSWER: A. CT Pulmonary Angiography (CTPA)
Rationale: CTPA is the first-line diagnostic imaging for suspected pulmonary embolism
due to its high specificity and sensitivity, especially in patients with a high pre-test
probability. It can identify thrombi in the pulmonary arteries. While pulmonary
angiography is the historical gold standard, it is invasive and rarely used. A V/Q scan
may be used if CTPA is contraindicated, but it has lower specificity, particularly in
patients with underlying lung disease like SLE.
Question 5: A 60-year-old male with a history of coronary artery disease
presents with acute substernal chest pain that is unrelieved by nitroglycerin.
His ECG shows ST-segment elevation in leads V1-V4. Which of the following is
the most appropriate immediate reperfusion strategy if the patient presents 3
hours after symptom onset?
,A. Immediate administration of tenecteplase
B. Urgent coronary artery bypass grafting (CABG)
C. Percutaneous coronary intervention (PCI)
D. High-dose intravenous heparin alone
CORRECT ANSWER: C. Percutaneous coronary intervention (PCI)
Rationale: For a patient with an ST-segment elevation myocardial infarction (STEMI)
presenting within 12 hours, the preferred reperfusion strategy is primary PCI if it can be
performed within 90-120 minutes of first medical contact. In this case, the patient is
within the time window, and PCI is superior to fibrinolysis in terms of mortality and re-
infarction. Fibrinolysis is an alternative if PCI is not available.
Question 6: A 28-year-old male is admitted with a severe asthma exacerbation.
His peak expiratory flow rate is 30% of predicted. He is using accessory
muscles and is unable to speak in full sentences. Despite continuous nebulized
albuterol and ipratropium, he remains tachypneic. Which of the following
findings would indicate the need for immediate intubation?
A. Heart rate of 110 bpm
B. Oxygen saturation of 90% on 50% FiO2
C. PaCO2 of 50 mmHg with a pH of 7.25
D. Respiratory rate of 28 breaths/min
CORRECT ANSWER: C. PaCO2 of 50 mmHg with a pH of 7.25
Rationale: In severe asthma, a rising PaCO2 with associated acidosis (respiratory
acidosis) is a sign of respiratory muscle fatigue and impending respiratory failure. This is
an ominous sign indicating the need for immediate intubation and mechanical
ventilation. While a low oxygen saturation is concerning, it is not an immediate
indication for intubation if it can be corrected with oxygen.
Question 7: A 65-year-old female with a history of CHF and atrial fibrillation is
admitted with acute decompensated heart failure. She is on a continuous
infusion of furosemide. Which of the following laboratory values is the most
important to monitor to assess the efficacy of the diuretic therapy?
A. Serum Sodium
B. Serum Creatinine
C. Urine Output
D. Serum BNP
CORRECT ANSWER: C. Urine Output
Rationale: In acute decompensated heart failure, the primary goal of diuretic therapy is
to achieve adequate diuresis to reduce volume overload. Monitoring urine output
provides a direct measure of the response to furosemide. While serum creatinine is
important to monitor for renal function, BNP can be delayed in its response, and sodium
, is a secondary concern. Urine output is the most immediate and reliable indicator of
efficacy.
Question 8: A 50-year-old male with a history of alcoholism presents with
acute pancreatitis. His serum lipase is markedly elevated. Which of the
following complications of acute pancreatitis is most likely to present within
the first 48 hours of admission?
A. Pancreatic pseudocyst
B. Acute Respiratory Distress Syndrome (ARDS)
C. Splenic vein thrombosis
D. Chronic pancreatitis
CORRECT ANSWER: B. Acute Respiratory Distress Syndrome (ARDS)
Rationale: ARDS is an early and potentially lethal complication of severe acute
pancreatitis, typically developing within 48 hours due to the systemic inflammatory
response syndrome (SIRS) triggered by the release of pancreatic enzymes and
cytokines. Pancreatic pseudocysts and splenic vein thrombosis are late complications
that usually develop weeks after the initial episode.
Question 9: A 70-year-old male is admitted with a subdural hematoma
following a fall. He is being managed with mannitol for elevated intracranial
pressure (ICP). Which of the following is a primary mechanism of action of
mannitol in reducing ICP?
A. Reducing cerebrospinal fluid production
B. Direct vasodilation of cerebral arteries
C. Creating an osmotic gradient to draw water from brain tissue
D. Decreasing cerebral metabolic rate
CORRECT ANSWER: C. Creating an osmotic gradient to draw water from brain
tissue
Rationale: Mannitol is an osmotic diuretic. Its primary mechanism for lowering ICP is by
increasing plasma osmolarity, which creates an osmotic gradient that draws water from
the brain parenchyma and interstitial spaces into the intravascular space, thereby
reducing cerebral edema and ICP. It also promotes diuresis, which further helps reduce
total body water.
Question 10: A 35-year-old female with a history of migraines presents with a
sudden onset of the worst headache of her life, described as a "thunderclap."
She is nauseous and has a stiff neck. Which of the following is the most
appropriate initial diagnostic test?
A. Non-contrast CT scan of the head
B. Lumbar puncture
C. Magnetic Resonance Angiography (MRA)
D. Electroencephalogram (EEG)
