NSG 530 Exam 4 Actual Exam V2 | NSG 530 Advanced
Pathophysiology (NSG530 Exam 4) [PDF] | Wilkes University
1. A 68-year-old male is admitted with a suspected ischemic stroke. The medical team is
focused on salvaging the ‘ischemic penumbra.’ What is the primary pathophysiological
characteristic of this region?
A. Irreversible neuronal necrosis and cell death
B. Area of hyperperfusion following successful recanalization
C. Zone of minimally perfused tissue that is potentially viable
D. Region of permanent neurological deficit due to glial scarring
Answer: C
Rationale: The ischemic penumbra represents the area surrounding the core infarct that
receives marginal blood flow. Cells in this region are functionally silent but metabolically
active, meaning they are at risk but potentially salvageable if perfusion is restored quickly.
Failure to restore flow leads to the expansion of the necrotic core into this zone.
2. A 32-year-old female presents with optic neuritis and paresthesia. MRI reveals multiple
plaques in the white matter of the CNS. Which process is fundamental to the progression of
this demyelinating disease?
A. Autoimmune-mediated destruction of oligodendrocytes
B. Degeneration of the peripheral nerve myelin sheath
C. Excessive accumulation of amyloid-beta plaques
D. Loss of dopaminergic neurons in the substantia nigra
Answer: A
Rationale: Multiple Sclerosis is characterized by an autoimmune attack against the myelin
sheath and oligodendrocytes in the central nervous system. This T-cell mediated response
leads to inflammation, demyelination, and eventually axonal loss. The focal areas of
damage, or plaques, disrupt nerve impulse conduction, leading to various neurological
deficits.
3. In the early stages of Parkinson’s Disease, why do clinical symptoms like tremors and
bradykinesia often remain absent despite ongoing neuronal loss?
A. The brain recruits the cerebellum to manage motor functions
B. Peripheral nerves increase their sensitivity to remaining dopamine
C. Compensatory mechanisms maintain function until 70-80% of neurons are lost
,D. The blood-brain barrier prevents the initial toxic buildup from affecting motor tracks
Answer: C
Rationale: Parkinson’s Disease involves the progressive loss of dopaminergic neurons in
the substantia nigra pars compacta. Clinical manifestations typically only emerge after a
significant threshold of neuronal loss, usually cited around 70% to 80%. During the
preclinical phase, the remaining neurons increase dopamine synthesis and receptors
upregulate to compensate for the deficiency.
4. A 72-year-old patient with Alzheimer’s disease is experiencing rapid cognitive decline.
Pathologically, the presence of neurofibrillary tangles is noted. What protein is primarily
responsible for the formation of these tangles?
A. Alpha-synuclein
B. Amyloid-beta
C. Tau protein
D. Huntingtin protein
Answer: C
Rationale: Neurofibrillary tangles are intracellular inclusions composed of
hyperphosphorylated tau protein. In a healthy brain, tau stabilizes microtubules; however,
in Alzheimer’s, it detaches and forms aggregates that disrupt nutrient transport. This
process, alongside amyloid-beta plaque formation, is a hallmark of the disease’s
neurodegenerative progression.
5. A patient with a severe traumatic brain injury (TBI) develops increased intracranial
pressure (ICP). According to the Monro-Kellie hypothesis, what must occur to maintain
normal ICP when a mass or edema increases intracranial volume?
A. Cerebrospinal fluid (CSF) and blood volume must decrease
B. The cranial vault expands to accommodate the extra volume
C. The brain tissue compresses significantly to reduce its volume
D. Systemic blood pressure must drop to reduce cerebral blood flow
Answer: A
Rationale: The Monro-Kellie hypothesis states that the cranial vault is a rigid container
with fixed volumes of brain tissue, blood, and CSF. If one component increases in volume,
the others must decrease to prevent an increase in ICP. CSF displacement into the spinal
subarachnoid space and venous blood shunting are the primary compensatory
mechanisms.
, 6. A 45-year-old male with a history of chronic alcoholism presents with gait ataxia and
confusion. If the underlying cause is a deficiency in Thiamine (Vitamin B1), which condition is
most likely developing?
A. Amyotrophic Lateral Sclerosis
B. Wernicke-Korsakoff Syndrome
C. Guillain-Barré Syndrome
D. Huntington’s Disease
Answer: B
Rationale: Wernicke-Korsakoff syndrome results from thiamine deficiency, often
secondary to alcohol abuse which impairs thiamine absorption. The acute phase (Wernicke
encephalopathy) presents with ataxia, ophthalmoplegia, and confusion. Chronic thiamine
deficiency leads to permanent structural damage in the mammillary bodies and thalamus.
7. During the acute phase of a spinal cord injury, a patient experiences a complete loss of all
reflex activity below the level of injury and flaccid paralysis. What is this clinical phenomenon
called?
A. Spinal Shock
B. Autonomic Dysreflexia
C. Brown-Séquard Syndrome
D. Neurogenic Shock
Answer: A
Rationale: Spinal shock is a temporary physiological state following acute spinal cord
injury characterized by the loss of all sensorimotor and reflex function below the lesion.
This includes the loss of deep tendon reflexes and autonomic control. It typically lasts days
to weeks before reflexes return and hyperreflexia/spasticity develops.
8. A patient with Myasthenia Gravis presents with severe respiratory distress. Which
physiological mechanism explains the muscle weakness seen in this patient?
A. Degeneration of the lower motor neurons
B. Excessive release of inhibitory neurotransmitters
C. Inhibition of acetylcholinesterase at the synapse
D. Destruction of acetylcholine receptors by antibodies
Answer: D
Rationale: Myasthenia Gravis is an autoimmune disorder where IgG antibodies attack and
destroy nicotinic acetylcholine receptors at the postsynaptic neuromuscular junction. This
Pathophysiology (NSG530 Exam 4) [PDF] | Wilkes University
1. A 68-year-old male is admitted with a suspected ischemic stroke. The medical team is
focused on salvaging the ‘ischemic penumbra.’ What is the primary pathophysiological
characteristic of this region?
A. Irreversible neuronal necrosis and cell death
B. Area of hyperperfusion following successful recanalization
C. Zone of minimally perfused tissue that is potentially viable
D. Region of permanent neurological deficit due to glial scarring
Answer: C
Rationale: The ischemic penumbra represents the area surrounding the core infarct that
receives marginal blood flow. Cells in this region are functionally silent but metabolically
active, meaning they are at risk but potentially salvageable if perfusion is restored quickly.
Failure to restore flow leads to the expansion of the necrotic core into this zone.
2. A 32-year-old female presents with optic neuritis and paresthesia. MRI reveals multiple
plaques in the white matter of the CNS. Which process is fundamental to the progression of
this demyelinating disease?
A. Autoimmune-mediated destruction of oligodendrocytes
B. Degeneration of the peripheral nerve myelin sheath
C. Excessive accumulation of amyloid-beta plaques
D. Loss of dopaminergic neurons in the substantia nigra
Answer: A
Rationale: Multiple Sclerosis is characterized by an autoimmune attack against the myelin
sheath and oligodendrocytes in the central nervous system. This T-cell mediated response
leads to inflammation, demyelination, and eventually axonal loss. The focal areas of
damage, or plaques, disrupt nerve impulse conduction, leading to various neurological
deficits.
3. In the early stages of Parkinson’s Disease, why do clinical symptoms like tremors and
bradykinesia often remain absent despite ongoing neuronal loss?
A. The brain recruits the cerebellum to manage motor functions
B. Peripheral nerves increase their sensitivity to remaining dopamine
C. Compensatory mechanisms maintain function until 70-80% of neurons are lost
,D. The blood-brain barrier prevents the initial toxic buildup from affecting motor tracks
Answer: C
Rationale: Parkinson’s Disease involves the progressive loss of dopaminergic neurons in
the substantia nigra pars compacta. Clinical manifestations typically only emerge after a
significant threshold of neuronal loss, usually cited around 70% to 80%. During the
preclinical phase, the remaining neurons increase dopamine synthesis and receptors
upregulate to compensate for the deficiency.
4. A 72-year-old patient with Alzheimer’s disease is experiencing rapid cognitive decline.
Pathologically, the presence of neurofibrillary tangles is noted. What protein is primarily
responsible for the formation of these tangles?
A. Alpha-synuclein
B. Amyloid-beta
C. Tau protein
D. Huntingtin protein
Answer: C
Rationale: Neurofibrillary tangles are intracellular inclusions composed of
hyperphosphorylated tau protein. In a healthy brain, tau stabilizes microtubules; however,
in Alzheimer’s, it detaches and forms aggregates that disrupt nutrient transport. This
process, alongside amyloid-beta plaque formation, is a hallmark of the disease’s
neurodegenerative progression.
5. A patient with a severe traumatic brain injury (TBI) develops increased intracranial
pressure (ICP). According to the Monro-Kellie hypothesis, what must occur to maintain
normal ICP when a mass or edema increases intracranial volume?
A. Cerebrospinal fluid (CSF) and blood volume must decrease
B. The cranial vault expands to accommodate the extra volume
C. The brain tissue compresses significantly to reduce its volume
D. Systemic blood pressure must drop to reduce cerebral blood flow
Answer: A
Rationale: The Monro-Kellie hypothesis states that the cranial vault is a rigid container
with fixed volumes of brain tissue, blood, and CSF. If one component increases in volume,
the others must decrease to prevent an increase in ICP. CSF displacement into the spinal
subarachnoid space and venous blood shunting are the primary compensatory
mechanisms.
, 6. A 45-year-old male with a history of chronic alcoholism presents with gait ataxia and
confusion. If the underlying cause is a deficiency in Thiamine (Vitamin B1), which condition is
most likely developing?
A. Amyotrophic Lateral Sclerosis
B. Wernicke-Korsakoff Syndrome
C. Guillain-Barré Syndrome
D. Huntington’s Disease
Answer: B
Rationale: Wernicke-Korsakoff syndrome results from thiamine deficiency, often
secondary to alcohol abuse which impairs thiamine absorption. The acute phase (Wernicke
encephalopathy) presents with ataxia, ophthalmoplegia, and confusion. Chronic thiamine
deficiency leads to permanent structural damage in the mammillary bodies and thalamus.
7. During the acute phase of a spinal cord injury, a patient experiences a complete loss of all
reflex activity below the level of injury and flaccid paralysis. What is this clinical phenomenon
called?
A. Spinal Shock
B. Autonomic Dysreflexia
C. Brown-Séquard Syndrome
D. Neurogenic Shock
Answer: A
Rationale: Spinal shock is a temporary physiological state following acute spinal cord
injury characterized by the loss of all sensorimotor and reflex function below the lesion.
This includes the loss of deep tendon reflexes and autonomic control. It typically lasts days
to weeks before reflexes return and hyperreflexia/spasticity develops.
8. A patient with Myasthenia Gravis presents with severe respiratory distress. Which
physiological mechanism explains the muscle weakness seen in this patient?
A. Degeneration of the lower motor neurons
B. Excessive release of inhibitory neurotransmitters
C. Inhibition of acetylcholinesterase at the synapse
D. Destruction of acetylcholine receptors by antibodies
Answer: D
Rationale: Myasthenia Gravis is an autoimmune disorder where IgG antibodies attack and
destroy nicotinic acetylcholine receptors at the postsynaptic neuromuscular junction. This
