,NSG 5140 Exam 3 Advanced Pathophysiology Questions And
Answers 2026/2027 South College
Q1. A 68-year-old client develops sudden right hemiparesis and
expressive aphasia. Magnetic resonance imaging demonstrates
restricted diffusion within the left middle cerebral artery territory.
Which cellular process most directly explains the early development
of cytotoxic cerebral edema?
A) Increased ATP-dependent sodium-potassium pump activity
B) Increased extracellular fluid clearance through intact ion transport
C) Excessive cerebrospinal fluid production by the choroid plexus
D) Failure of ATP-dependent ion transport causing intracellular sodium and
water accumulation
Correct Answer: D) Failure of ATP-dependent ion transport causing
intracellular sodium and water accumulation
Rationale: Cerebral ischemia reduces oxygen and glucose delivery, rapidly
impairing mitochondrial ATP synthesis. Failure of sodium-potassium ATPase
activity causes intracellular sodium accumulation, potassium loss, and water
influx. Neurons, astrocytes, and other cells swell, producing cytotoxic edema.
Restricted water diffusion is an early imaging manifestation of this process.
Q2. A 59-year-old client experiences prolonged cerebral ischemia
followed by reperfusion. Neuronal injury progresses despite
restoration of cerebral blood flow. Which mechanism contributes
most directly to ischemic excitotoxicity?
A) Excessive glutamate release causing NMDA receptor activation, calcium
influx, and destructive intracellular signaling
B) Complete inhibition of excitatory neurotransmitter release
C) Increased neuronal ATP production without oxidative stress
D) Permanent suppression of calcium-dependent enzymes
Correct Answer: A) Excessive glutamate release causing NMDA receptor
activation, calcium influx, and destructive intracellular signaling
Rationale: Ischemia disrupts neuronal energy metabolism and glutamate
clearance. Excess extracellular glutamate activates NMDA and other
excitatory receptors, allowing excessive calcium entry. Intracellular calcium
,overload activates proteases, phospholipases, and nitric oxide-producing
pathways that contribute to mitochondrial dysfunction and neuronal death.
Q3. A 72-year-old client experiences an intracerebral hemorrhage.
During the following 48 hours, perihematomal edema increases
despite stabilization of the bleeding. Which mechanism most
directly contributes to the delayed swelling?
A) Complete restoration of endothelial barrier function
B) Reduced inflammatory activity around the hematoma
C) Blood-brain barrier disruption, inflammatory signaling, and toxicity from
blood breakdown products
D) Increased cerebrospinal fluid absorption eliminating tissue edema
Correct Answer: C) Blood-brain barrier disruption, inflammatory signaling,
and toxicity from blood breakdown products
Rationale: Intracerebral hemorrhage causes primary mechanical tissue injury
and secondary damage from thrombin, hemoglobin degradation, iron-
mediated oxidative stress, and inflammation. These processes disrupt the
blood-brain barrier and promote vasogenic edema. The resulting swelling
may increase intracranial pressure and worsen neurological injury.
Q4. A 64-year-old client with severe traumatic brain injury develops
rising intracranial pressure. Mean arterial pressure remains 82
mmHg, but intracranial pressure increases from 14 to 30 mmHg.
Which physiological consequence occurs?
A) Increased cerebral perfusion pressure
B) Reduced cerebral perfusion pressure and increased risk of secondary
ischemic injury
C) Increased cerebrospinal fluid production as the only effect
D) Complete preservation of cerebral blood flow regardless of pressure
changes
Correct Answer: B) Reduced cerebral perfusion pressure and increased risk of
secondary ischemic injury
Rationale: Cerebral perfusion pressure is approximately mean arterial
pressure minus intracranial pressure. Initially, CPP is 82 − 14 = 68 mmHg.
After intracranial pressure rises, CPP decreases to 82 − 30 = 52 mmHg.
, Reduced perfusion pressure may compromise cerebral blood flow,
particularly when autoregulation is impaired.
Q5. A 57-year-old client with severe neurological injury develops
hypertension, bradycardia, and irregular respirations. Which
physiological process most directly explains this combination?
A) Increased peripheral insulin resistance
B) Primary adrenal hormone deficiency
C) Complete suppression of brainstem autonomic regulation
D) Elevated intracranial pressure producing brainstem ischemia and
compensatory sympathetic activation
Correct Answer: D) Elevated intracranial pressure producing brainstem
ischemia and compensatory sympathetic activation
Rationale: The Cushing response is associated with severe intracranial
hypertension and threatened brainstem perfusion. Sympathetic activation
increases systemic blood pressure in an attempt to maintain cerebral
perfusion. The resulting hypertension may trigger reflex bradycardia, while
brainstem dysfunction produces abnormal respirations. This is a late and
concerning sign.
Q6. A 45-year-old client develops communicating hydrocephalus
following subarachnoid hemorrhage. Imaging demonstrates
enlargement of the lateral, third, and fourth ventricles without a
focal obstruction within the ventricular system. Which mechanism
most likely explains the condition?
A) Increased sodium reabsorption by renal tubules
B) Reduced cerebrospinal fluid absorption through arachnoid granulations
C) Excessive ventricular tissue destruction without altered CSF movement
D) Isolated obstruction of the cerebral aqueduct
Correct Answer: B) Reduced cerebrospinal fluid absorption through arachnoid
granulations
Rationale: Communicating hydrocephalus occurs when cerebrospinal fluid
can move through the ventricular system but absorption into the venous
circulation is impaired. Blood products and inflammation following
Answers 2026/2027 South College
Q1. A 68-year-old client develops sudden right hemiparesis and
expressive aphasia. Magnetic resonance imaging demonstrates
restricted diffusion within the left middle cerebral artery territory.
Which cellular process most directly explains the early development
of cytotoxic cerebral edema?
A) Increased ATP-dependent sodium-potassium pump activity
B) Increased extracellular fluid clearance through intact ion transport
C) Excessive cerebrospinal fluid production by the choroid plexus
D) Failure of ATP-dependent ion transport causing intracellular sodium and
water accumulation
Correct Answer: D) Failure of ATP-dependent ion transport causing
intracellular sodium and water accumulation
Rationale: Cerebral ischemia reduces oxygen and glucose delivery, rapidly
impairing mitochondrial ATP synthesis. Failure of sodium-potassium ATPase
activity causes intracellular sodium accumulation, potassium loss, and water
influx. Neurons, astrocytes, and other cells swell, producing cytotoxic edema.
Restricted water diffusion is an early imaging manifestation of this process.
Q2. A 59-year-old client experiences prolonged cerebral ischemia
followed by reperfusion. Neuronal injury progresses despite
restoration of cerebral blood flow. Which mechanism contributes
most directly to ischemic excitotoxicity?
A) Excessive glutamate release causing NMDA receptor activation, calcium
influx, and destructive intracellular signaling
B) Complete inhibition of excitatory neurotransmitter release
C) Increased neuronal ATP production without oxidative stress
D) Permanent suppression of calcium-dependent enzymes
Correct Answer: A) Excessive glutamate release causing NMDA receptor
activation, calcium influx, and destructive intracellular signaling
Rationale: Ischemia disrupts neuronal energy metabolism and glutamate
clearance. Excess extracellular glutamate activates NMDA and other
excitatory receptors, allowing excessive calcium entry. Intracellular calcium
,overload activates proteases, phospholipases, and nitric oxide-producing
pathways that contribute to mitochondrial dysfunction and neuronal death.
Q3. A 72-year-old client experiences an intracerebral hemorrhage.
During the following 48 hours, perihematomal edema increases
despite stabilization of the bleeding. Which mechanism most
directly contributes to the delayed swelling?
A) Complete restoration of endothelial barrier function
B) Reduced inflammatory activity around the hematoma
C) Blood-brain barrier disruption, inflammatory signaling, and toxicity from
blood breakdown products
D) Increased cerebrospinal fluid absorption eliminating tissue edema
Correct Answer: C) Blood-brain barrier disruption, inflammatory signaling,
and toxicity from blood breakdown products
Rationale: Intracerebral hemorrhage causes primary mechanical tissue injury
and secondary damage from thrombin, hemoglobin degradation, iron-
mediated oxidative stress, and inflammation. These processes disrupt the
blood-brain barrier and promote vasogenic edema. The resulting swelling
may increase intracranial pressure and worsen neurological injury.
Q4. A 64-year-old client with severe traumatic brain injury develops
rising intracranial pressure. Mean arterial pressure remains 82
mmHg, but intracranial pressure increases from 14 to 30 mmHg.
Which physiological consequence occurs?
A) Increased cerebral perfusion pressure
B) Reduced cerebral perfusion pressure and increased risk of secondary
ischemic injury
C) Increased cerebrospinal fluid production as the only effect
D) Complete preservation of cerebral blood flow regardless of pressure
changes
Correct Answer: B) Reduced cerebral perfusion pressure and increased risk of
secondary ischemic injury
Rationale: Cerebral perfusion pressure is approximately mean arterial
pressure minus intracranial pressure. Initially, CPP is 82 − 14 = 68 mmHg.
After intracranial pressure rises, CPP decreases to 82 − 30 = 52 mmHg.
, Reduced perfusion pressure may compromise cerebral blood flow,
particularly when autoregulation is impaired.
Q5. A 57-year-old client with severe neurological injury develops
hypertension, bradycardia, and irregular respirations. Which
physiological process most directly explains this combination?
A) Increased peripheral insulin resistance
B) Primary adrenal hormone deficiency
C) Complete suppression of brainstem autonomic regulation
D) Elevated intracranial pressure producing brainstem ischemia and
compensatory sympathetic activation
Correct Answer: D) Elevated intracranial pressure producing brainstem
ischemia and compensatory sympathetic activation
Rationale: The Cushing response is associated with severe intracranial
hypertension and threatened brainstem perfusion. Sympathetic activation
increases systemic blood pressure in an attempt to maintain cerebral
perfusion. The resulting hypertension may trigger reflex bradycardia, while
brainstem dysfunction produces abnormal respirations. This is a late and
concerning sign.
Q6. A 45-year-old client develops communicating hydrocephalus
following subarachnoid hemorrhage. Imaging demonstrates
enlargement of the lateral, third, and fourth ventricles without a
focal obstruction within the ventricular system. Which mechanism
most likely explains the condition?
A) Increased sodium reabsorption by renal tubules
B) Reduced cerebrospinal fluid absorption through arachnoid granulations
C) Excessive ventricular tissue destruction without altered CSF movement
D) Isolated obstruction of the cerebral aqueduct
Correct Answer: B) Reduced cerebrospinal fluid absorption through arachnoid
granulations
Rationale: Communicating hydrocephalus occurs when cerebrospinal fluid
can move through the ventricular system but absorption into the venous
circulation is impaired. Blood products and inflammation following
