NSG 3850 / NSG3850 (Latest
2025/2026 Update) Pathophysiology
for Nurses II | Questions & Answers |
Grade A | 100% Verified Solutions –
Galen
1. What is the primary pathophysiological difference between ischemic and
hemorrhagic stroke?
Answer: Ischemic stroke is caused by a blockage of a cerebral artery, leading to
cerebral infarction due to lack of blood flow. Hemorrhagic stroke is caused by the
rupture of a blood vessel in the brain, leading to tissue damage from blood
accumulation, compression, and increased intracranial pressure.
2. Define cerebral perfusion pressure (CPP) and explain its clinical
significance.
Answer: CPP is the net pressure gradient causing blood flow to the brain. It is
calculated as CPP = Mean Arterial Pressure (MAP) - Intracranial Pressure
(ICP). A CPP below 50-60 mmHg risks cerebral ischemia, as there is insufficient
pressure to perfuse the brain.
3. Describe the Monro-Kellie doctrine.
Answer: This doctrine states that the cranial vault is a rigid, fixed volume
containing three components: brain tissue, blood, and cerebrospinal fluid (CSF).
An increase in the volume of one component must be compensated by a decrease
in another to prevent a rise in intracranial pressure (ICP).
4. A patient presents with unilateral weakness, facial droop, and slurred
speech that resolved within 30 minutes. What is the most likely diagnosis, and
why is it significant?
Answer: This describes a Transient Ischemic Attack (TIA). It is significant
because it is a major warning sign for an impending full ischemic stroke, requiring
immediate intervention and risk factor management.
, 5. Differentiate between seizures and epilepsy.
Answer: A seizure is a single, transient event due to abnormal, excessive electrical
discharges in the brain. Epilepsy is a chronic neurological disorder characterized
by recurrent, unprovoked seizures.
6. What is status epilepticus, and why is it a medical emergency?
Answer: Status epilepticus is a continuous seizure lasting more than 5 minutes or
recurrent seizures without regaining consciousness between them. It is an
emergency because it can cause permanent neuronal damage, hypoxia, and
systemic complications like lactic acidosis and hyperthermia.
7. Explain the mechanism of injury in a concussion.
Answer: A concussion is a mild traumatic brain injury. The mechanism involves
rapid acceleration-deceleration of the brain within the skull, leading to shearing
and stretching of axons, a transient disruption of neuronal function, and altered
cerebral blood flow, without significant structural damage on standard imaging.
8. Describe the pathophysiological process of Parkinson's disease.
Answer: Parkinson's disease is characterized by the progressive degeneration of
dopamine-producing neurons in the substantia nigra of the basal ganglia. This
dopamine deficiency leads to an imbalance with acetylcholine, causing the classic
motor symptoms: tremor, rigidity, bradykinesia, and postural instability.
9. What are the hallmark pathological findings in Alzheimer's disease?
Answer: The two hallmark findings are 1) Amyloid plaques (extracellular
deposits of beta-amyloid protein) and 2) Neurofibrillary tangles (intracellular
twisted strands of hyperphosphorylated tau protein). These lead to cortical atrophy,
synaptic loss, and neurotransmitter deficits (especially acetylcholine).
10. Compare and contrast Multiple Sclerosis (MS) and Guillain-Barré
Syndrome (GBS).
Answer: MS is an autoimmune, demyelinating disorder of the Central Nervous
System (brain and spinal cord), characterized by episodic and progressive
neurological deficits. GBS is an autoimmune, demyelinating (and sometimes
axonal) disorder of the Peripheral Nervous System, characterized by an acute,
ascending paralysis, often triggered by an infection.
2025/2026 Update) Pathophysiology
for Nurses II | Questions & Answers |
Grade A | 100% Verified Solutions –
Galen
1. What is the primary pathophysiological difference between ischemic and
hemorrhagic stroke?
Answer: Ischemic stroke is caused by a blockage of a cerebral artery, leading to
cerebral infarction due to lack of blood flow. Hemorrhagic stroke is caused by the
rupture of a blood vessel in the brain, leading to tissue damage from blood
accumulation, compression, and increased intracranial pressure.
2. Define cerebral perfusion pressure (CPP) and explain its clinical
significance.
Answer: CPP is the net pressure gradient causing blood flow to the brain. It is
calculated as CPP = Mean Arterial Pressure (MAP) - Intracranial Pressure
(ICP). A CPP below 50-60 mmHg risks cerebral ischemia, as there is insufficient
pressure to perfuse the brain.
3. Describe the Monro-Kellie doctrine.
Answer: This doctrine states that the cranial vault is a rigid, fixed volume
containing three components: brain tissue, blood, and cerebrospinal fluid (CSF).
An increase in the volume of one component must be compensated by a decrease
in another to prevent a rise in intracranial pressure (ICP).
4. A patient presents with unilateral weakness, facial droop, and slurred
speech that resolved within 30 minutes. What is the most likely diagnosis, and
why is it significant?
Answer: This describes a Transient Ischemic Attack (TIA). It is significant
because it is a major warning sign for an impending full ischemic stroke, requiring
immediate intervention and risk factor management.
, 5. Differentiate between seizures and epilepsy.
Answer: A seizure is a single, transient event due to abnormal, excessive electrical
discharges in the brain. Epilepsy is a chronic neurological disorder characterized
by recurrent, unprovoked seizures.
6. What is status epilepticus, and why is it a medical emergency?
Answer: Status epilepticus is a continuous seizure lasting more than 5 minutes or
recurrent seizures without regaining consciousness between them. It is an
emergency because it can cause permanent neuronal damage, hypoxia, and
systemic complications like lactic acidosis and hyperthermia.
7. Explain the mechanism of injury in a concussion.
Answer: A concussion is a mild traumatic brain injury. The mechanism involves
rapid acceleration-deceleration of the brain within the skull, leading to shearing
and stretching of axons, a transient disruption of neuronal function, and altered
cerebral blood flow, without significant structural damage on standard imaging.
8. Describe the pathophysiological process of Parkinson's disease.
Answer: Parkinson's disease is characterized by the progressive degeneration of
dopamine-producing neurons in the substantia nigra of the basal ganglia. This
dopamine deficiency leads to an imbalance with acetylcholine, causing the classic
motor symptoms: tremor, rigidity, bradykinesia, and postural instability.
9. What are the hallmark pathological findings in Alzheimer's disease?
Answer: The two hallmark findings are 1) Amyloid plaques (extracellular
deposits of beta-amyloid protein) and 2) Neurofibrillary tangles (intracellular
twisted strands of hyperphosphorylated tau protein). These lead to cortical atrophy,
synaptic loss, and neurotransmitter deficits (especially acetylcholine).
10. Compare and contrast Multiple Sclerosis (MS) and Guillain-Barré
Syndrome (GBS).
Answer: MS is an autoimmune, demyelinating disorder of the Central Nervous
System (brain and spinal cord), characterized by episodic and progressive
neurological deficits. GBS is an autoimmune, demyelinating (and sometimes
axonal) disorder of the Peripheral Nervous System, characterized by an acute,
ascending paralysis, often triggered by an infection.
