NSG 3800 Exam 4 EXAM with Questions and
Answers/Plus a Rationale Updated 2026 A+/Instant
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EXAM COVERAGE
1. Advanced Pathophysiological Concepts and Multisystem Failure
2. Complex Pharmacological Management and Toxicological Emergencies
3. Critical Care Nursing Interventions and Hemodynamic Monitoring
4. Emergency, Trauma, and Disaster Nursing Protocols
5. Evidence-Based Clinical Decision Making and Safety Standards
6. Professional Leadership, Quality Improvement, and Ethical Practice
1. A patient with severe septic shock is receiving aggressive fluid resuscitation and an infusion of
norepinephrine. Despite achieving a mean arterial pressure (MAP) of 65 mmHg, the central
venous oxygen saturation (ScvO2) remains at 52%, and serum lactate levels continue to rise.
Which physiological mechanism best explains these findings, and what intervention should the
nurse anticipate next?
A. Persistent arterial vasodilation; anticipate an order to titrate norepinephrine upward to
increase systemic vascular resistance.
B. Inadequate cellular oxygen delivery relative to demand; anticipate an order to initiate
an inotropic agent such as dobutamine.
C. Cardiogenic failure secondary to fluid overload; anticipate an order to administer intravenous
loop diuretics.
D. Severe metabolic alkalosis; anticipate an order for a bicarbonate continuous infusion.
CORRECT ANSWER : B
, Rationale: A low ScvO2 (less than 70%) combined with rising lactate indicates that despite
adequate perfusion pressure (MAP >= 65 mmHg), tissue oxygen delivery is insufficient to meet
high metabolic demands, often due to myocardial depression or persistent microcirculatory
shunting in septic shock. Initiating an inotrope like dobutamine increases cardiac output and
tissue oxygen delivery. Simply increasing vasopressors (Option A) will worsen afterload without
fixing cardiac output, while diuretics (Option C) or bicarbonate (Option D) are inappropriate
for tissue hypoperfusion.
2. A patient admitted with acute respiratory distress syndrome (ARDS) is placed on mechanical
ventilation with low tidal volume ventilation ($6\text{ mL/kg}$ of ideal body weight) and high
positive end-expiratory pressure (PEEP). Which clinical rationale underpins this ventilation
strategy?
A. To maximize minute ventilation and normalize arterial carbon dioxide levels rapidly.
B. To prevent ventilator-induced lung injury (VILI) by reducing alveolar overdistension
and preventing end-expiratory alveolar collapse.
C. To decrease central venous pressure and minimize the risk of right ventricular failure.
D. To eliminate the need for sedation and neuromuscular blockade during the acute phase.
CORRECT ANSWER : B
Rationale: Low tidal volume ventilation prevents volutrauma and barotrauma by avoiding
alveolar overdistension, while high PEEP prevents atelectotrauma by keeping fragile alveoli
open at the end of expiration (recruitment). This strategy, known as lung-protective ventilation,
significantly reduces mortality in ARDS. It often permits permissive hypercapnia (Option A is
incorrect), does not directly target central venous pressure (Option C), and does not eliminate
the need for sedation when severe dyssynchrony occurs (Option D).
3. A patient with cirrhosis and portal hypertension develops acute encephalopathy and massive
upper gastrointestinal bleeding from esophageal varices. Following successful endoscopic band
ligation, the physician orders octreotide infusion and lactulose. What is the precise mechanism of
action of octreotide in this clinical scenario?
A. It binds to gamma-aminobutyric acid receptors in the brain to clear serum ammonia levels.
B. It selectively splanchnic vasoconstricts, thereby reducing portal venous pressure and
collateral blood flow.
C. It acts as an osmotic laxative to eliminate nitrogenous waste products from the bowel lumen.
D. It increases systemic blood pressure to enhance renal perfusion and prevent hepatorenal
syndrome.
, CORRECT ANSWER : B
Rationale: Octreotide is a synthetic somatostatin analogue that causes splanchnic
vasoconstriction, which decreases blood flow into the portal system and reduces portal venous
pressure, helping to control acute variceal hemorrhage. Option A describes the mechanism of
flumazenil or benzodiazepine antagonists, not octreotide. Option C describes lactulose. Option D
is incorrect because octreotide primarily targets splanchnic beds rather than systemic arterial
pressure.
4. A nurse is monitoring a patient receiving a continuous intravenous infusion of regular insulin for
diabetic ketoacidosis (DKA). The patient's blood glucose level has dropped from $450\text{
mg/dL}$ to $220\text{ mg/dL}$ within two hours. Which nursing action is critical at this
juncture?
A. Immediately discontinue the insulin infusion to prevent rebound hyperglycemia.
B. Add 5% dextrose to the intravenous fluid infusion while continuing the insulin drip at a
reduced rate.
C. Administer a subcutaneous dose of long-acting insulin and turn off all intravenous fluids.
D. Increase the insulin infusion rate to ensure complete clearance of serum ketones.
CORRECT ANSWER : B
Rationale: When blood glucose reaches $200\text{ mg/dL}$ in DKA, 5% dextrose must be added
to the IV fluids to prevent rapid hypoglycemia and cerebral edema, while the insulin infusion is
continued at a lower rate to clear the anion-gap metabolic acidosis and suppress ketogenesis.
Discontinuing insulin abruptly (Option A) causes ketoacidosis to rebound. Increasing insulin
(Option D) without dextrose would induce profound hypoglycemia.
5. A patient is admitted to the intensive care unit following a severe traumatic brain injury (TBI).
Intracranial pressure (ICP) monitoring indicates an ICP of $24\text{ mmHg}$ and a mean
arterial pressure (MAP) of $85\text{ mmHg}$. Which calculation represents the correct cerebral
perfusion pressure (CPP), and what is the clinical evaluation of this value?
A. CPP is $61\text{ mmHg}$, which is within normal limits for cerebral autoregulation.
B. CPP is $61\text{ mmHg}$, which is below the target threshold, indicating compromised
cerebral perfusion.
C. CPP is $109\text{ mmHg}$, which places the patient at high risk for cerebral hemorrhage.
D. CPP is $34\text{ mmHg}$, which indicates imminent brain death.
CORRECT ANSWER : B
, Rationale: Cerebral perfusion pressure is calculated as $\text{CPP} = \text{MAP} - \text{ICP}$.
Here, $85 - 24 = 61\text{ mmHg}$. The recommended target range for CPP in adult TBI
patients is $60\text{ to }70\text{ mmHg}$ or $60\text{ to }80\text{ mmHg}$. While $61\text{
mmHg}$ is marginally within the lower limit, it is near the threshold of ischemia ($<60\text{
mmHg}$), requiring vigilant monitoring to prevent downward spikes.
6. A patient with acute kidney injury (AKI) secondary to rhabdomyolysis exhibits peaked T waves,
a prolonged PR interval, and widened QRS complexes on the electrocardiogram. Which
immediate pharmacological intervention should the nurse anticipate?
A. Intravenous administration of regular insulin and dextrose to shift potassium intracellularly.
B. Intravenous administration of calcium gluconate to stabilize the cardiac myocardial
membrane.
C. Administration of oral sodium polystyrene sulfonate to eliminate potassium via the
gastrointestinal tract.
D. Initiation of urgent continuous renal replacement therapy to remove circulating myoglobin.
CORRECT ANSWER : B
Rationale: The ECG changes indicate severe, life-threatening hyperkalemia with cardiac
toxicity. The immediate priority is administering intravenous calcium gluconate or calcium
chloride to stabilize the cardiac cell membrane and prevent fatal ventricular arrhythmias.
Insulin and dextrose (Option A) shift potassium but take longer to act. Kayexalate (Option C) is
too slow for acute cardiac toxicity. Dialysis (Option D) is definitive but takes time to set up.
7. A patient is recovering from a thyroidectomy. Two hours post-procedure, the nurse notes
inspiratory stridor, frequent muscle twitching in the hands, and a positive Chvostek's sign. What
is the nurse's immediate priority action?
A. Apply a non-rebreather oxygen mask at $15\text{ L/min}$ and encourage deep breathing.
B. Notify the provider immediately and ensure intravenous calcium gluconate is readily
available at the bedside.
C. Administer prescribed oral potassium chloride supplements immediately.
D. Re-open the surgical incision at the bedside to relieve hematoma pressure.
CORRECT ANSWER : B
Rationale: Inspiratory stridor combined with muscle twitching and a positive Chvostek's sign
indicates acute hypocalcemia resulting from accidental parathyroid gland removal or trauma
during thyroidectomy, which can cause laryngeal spasm and airway obstruction. Intravenous
Answers/Plus a Rationale Updated 2026 A+/Instant
Download PDF
EXAM COVERAGE
1. Advanced Pathophysiological Concepts and Multisystem Failure
2. Complex Pharmacological Management and Toxicological Emergencies
3. Critical Care Nursing Interventions and Hemodynamic Monitoring
4. Emergency, Trauma, and Disaster Nursing Protocols
5. Evidence-Based Clinical Decision Making and Safety Standards
6. Professional Leadership, Quality Improvement, and Ethical Practice
1. A patient with severe septic shock is receiving aggressive fluid resuscitation and an infusion of
norepinephrine. Despite achieving a mean arterial pressure (MAP) of 65 mmHg, the central
venous oxygen saturation (ScvO2) remains at 52%, and serum lactate levels continue to rise.
Which physiological mechanism best explains these findings, and what intervention should the
nurse anticipate next?
A. Persistent arterial vasodilation; anticipate an order to titrate norepinephrine upward to
increase systemic vascular resistance.
B. Inadequate cellular oxygen delivery relative to demand; anticipate an order to initiate
an inotropic agent such as dobutamine.
C. Cardiogenic failure secondary to fluid overload; anticipate an order to administer intravenous
loop diuretics.
D. Severe metabolic alkalosis; anticipate an order for a bicarbonate continuous infusion.
CORRECT ANSWER : B
, Rationale: A low ScvO2 (less than 70%) combined with rising lactate indicates that despite
adequate perfusion pressure (MAP >= 65 mmHg), tissue oxygen delivery is insufficient to meet
high metabolic demands, often due to myocardial depression or persistent microcirculatory
shunting in septic shock. Initiating an inotrope like dobutamine increases cardiac output and
tissue oxygen delivery. Simply increasing vasopressors (Option A) will worsen afterload without
fixing cardiac output, while diuretics (Option C) or bicarbonate (Option D) are inappropriate
for tissue hypoperfusion.
2. A patient admitted with acute respiratory distress syndrome (ARDS) is placed on mechanical
ventilation with low tidal volume ventilation ($6\text{ mL/kg}$ of ideal body weight) and high
positive end-expiratory pressure (PEEP). Which clinical rationale underpins this ventilation
strategy?
A. To maximize minute ventilation and normalize arterial carbon dioxide levels rapidly.
B. To prevent ventilator-induced lung injury (VILI) by reducing alveolar overdistension
and preventing end-expiratory alveolar collapse.
C. To decrease central venous pressure and minimize the risk of right ventricular failure.
D. To eliminate the need for sedation and neuromuscular blockade during the acute phase.
CORRECT ANSWER : B
Rationale: Low tidal volume ventilation prevents volutrauma and barotrauma by avoiding
alveolar overdistension, while high PEEP prevents atelectotrauma by keeping fragile alveoli
open at the end of expiration (recruitment). This strategy, known as lung-protective ventilation,
significantly reduces mortality in ARDS. It often permits permissive hypercapnia (Option A is
incorrect), does not directly target central venous pressure (Option C), and does not eliminate
the need for sedation when severe dyssynchrony occurs (Option D).
3. A patient with cirrhosis and portal hypertension develops acute encephalopathy and massive
upper gastrointestinal bleeding from esophageal varices. Following successful endoscopic band
ligation, the physician orders octreotide infusion and lactulose. What is the precise mechanism of
action of octreotide in this clinical scenario?
A. It binds to gamma-aminobutyric acid receptors in the brain to clear serum ammonia levels.
B. It selectively splanchnic vasoconstricts, thereby reducing portal venous pressure and
collateral blood flow.
C. It acts as an osmotic laxative to eliminate nitrogenous waste products from the bowel lumen.
D. It increases systemic blood pressure to enhance renal perfusion and prevent hepatorenal
syndrome.
, CORRECT ANSWER : B
Rationale: Octreotide is a synthetic somatostatin analogue that causes splanchnic
vasoconstriction, which decreases blood flow into the portal system and reduces portal venous
pressure, helping to control acute variceal hemorrhage. Option A describes the mechanism of
flumazenil or benzodiazepine antagonists, not octreotide. Option C describes lactulose. Option D
is incorrect because octreotide primarily targets splanchnic beds rather than systemic arterial
pressure.
4. A nurse is monitoring a patient receiving a continuous intravenous infusion of regular insulin for
diabetic ketoacidosis (DKA). The patient's blood glucose level has dropped from $450\text{
mg/dL}$ to $220\text{ mg/dL}$ within two hours. Which nursing action is critical at this
juncture?
A. Immediately discontinue the insulin infusion to prevent rebound hyperglycemia.
B. Add 5% dextrose to the intravenous fluid infusion while continuing the insulin drip at a
reduced rate.
C. Administer a subcutaneous dose of long-acting insulin and turn off all intravenous fluids.
D. Increase the insulin infusion rate to ensure complete clearance of serum ketones.
CORRECT ANSWER : B
Rationale: When blood glucose reaches $200\text{ mg/dL}$ in DKA, 5% dextrose must be added
to the IV fluids to prevent rapid hypoglycemia and cerebral edema, while the insulin infusion is
continued at a lower rate to clear the anion-gap metabolic acidosis and suppress ketogenesis.
Discontinuing insulin abruptly (Option A) causes ketoacidosis to rebound. Increasing insulin
(Option D) without dextrose would induce profound hypoglycemia.
5. A patient is admitted to the intensive care unit following a severe traumatic brain injury (TBI).
Intracranial pressure (ICP) monitoring indicates an ICP of $24\text{ mmHg}$ and a mean
arterial pressure (MAP) of $85\text{ mmHg}$. Which calculation represents the correct cerebral
perfusion pressure (CPP), and what is the clinical evaluation of this value?
A. CPP is $61\text{ mmHg}$, which is within normal limits for cerebral autoregulation.
B. CPP is $61\text{ mmHg}$, which is below the target threshold, indicating compromised
cerebral perfusion.
C. CPP is $109\text{ mmHg}$, which places the patient at high risk for cerebral hemorrhage.
D. CPP is $34\text{ mmHg}$, which indicates imminent brain death.
CORRECT ANSWER : B
, Rationale: Cerebral perfusion pressure is calculated as $\text{CPP} = \text{MAP} - \text{ICP}$.
Here, $85 - 24 = 61\text{ mmHg}$. The recommended target range for CPP in adult TBI
patients is $60\text{ to }70\text{ mmHg}$ or $60\text{ to }80\text{ mmHg}$. While $61\text{
mmHg}$ is marginally within the lower limit, it is near the threshold of ischemia ($<60\text{
mmHg}$), requiring vigilant monitoring to prevent downward spikes.
6. A patient with acute kidney injury (AKI) secondary to rhabdomyolysis exhibits peaked T waves,
a prolonged PR interval, and widened QRS complexes on the electrocardiogram. Which
immediate pharmacological intervention should the nurse anticipate?
A. Intravenous administration of regular insulin and dextrose to shift potassium intracellularly.
B. Intravenous administration of calcium gluconate to stabilize the cardiac myocardial
membrane.
C. Administration of oral sodium polystyrene sulfonate to eliminate potassium via the
gastrointestinal tract.
D. Initiation of urgent continuous renal replacement therapy to remove circulating myoglobin.
CORRECT ANSWER : B
Rationale: The ECG changes indicate severe, life-threatening hyperkalemia with cardiac
toxicity. The immediate priority is administering intravenous calcium gluconate or calcium
chloride to stabilize the cardiac cell membrane and prevent fatal ventricular arrhythmias.
Insulin and dextrose (Option A) shift potassium but take longer to act. Kayexalate (Option C) is
too slow for acute cardiac toxicity. Dialysis (Option D) is definitive but takes time to set up.
7. A patient is recovering from a thyroidectomy. Two hours post-procedure, the nurse notes
inspiratory stridor, frequent muscle twitching in the hands, and a positive Chvostek's sign. What
is the nurse's immediate priority action?
A. Apply a non-rebreather oxygen mask at $15\text{ L/min}$ and encourage deep breathing.
B. Notify the provider immediately and ensure intravenous calcium gluconate is readily
available at the bedside.
C. Administer prescribed oral potassium chloride supplements immediately.
D. Re-open the surgical incision at the bedside to relieve hematoma pressure.
CORRECT ANSWER : B
Rationale: Inspiratory stridor combined with muscle twitching and a positive Chvostek's sign
indicates acute hypocalcemia resulting from accidental parathyroid gland removal or trauma
during thyroidectomy, which can cause laryngeal spasm and airway obstruction. Intravenous
