Neuropathy Practice Test — Questions and Answers

Question 1: What are the accepted first-line treatments for CIDP?

Rituximab and cyclophosphamide
Corticosteroids, IVIG, or plasmapheresis (Correct answer)
Interferon-beta and natalizumab
Azathioprine and methotrexate

Correct answer: Corticosteroids, IVIG, or plasmapheresis

Corticosteroids, IVIG, and plasmapheresis all have established efficacy as first-line therapies for CIDP, with choice guided by patient factors and tolerability.

Question 2: A patient with neuropathy reports severe pain when a bedsheet lightly touches their feet. This painful response to a normally non-painful stimulus is called:

Paresthesia
Dysarthria
Hypoesthesia
Allodynia (Correct answer)

Correct answer: Allodynia

Allodynia is pain produced by a stimulus that does not normally cause pain, such as light touch.

Question 3: Which bedside test is used to evaluate cardiovagal autonomic function in cardiac autonomic neuropathy?

Tilt table test
Heart rate variability with deep breathing (E:I ratio) (Correct answer)
Quantitative sudomotor axon reflex test
Thermoregulatory sweat test

Correct answer: Heart rate variability with deep breathing (E:I ratio)

The heart rate response to deep breathing (E:I ratio) is a sensitive, non-invasive test of parasympathetic cardiac function.

Question 4: Fludrocortisone is used in autonomic neuropathy to treat orthostatic hypotension through which mechanism?

Reducing nitric oxide-mediated vasodilation
Expansion of plasma volume via sodium retention (Correct answer)
Increasing heart rate via beta-1 stimulation
Vasoconstriction via alpha-1 receptors

Correct answer: Expansion of plasma volume via sodium retention

Fludrocortisone is a mineralocorticoid that causes renal sodium retention, expanding plasma volume and reducing orthostatic hypotension.

Question 5: Diabetic amyotrophy (proximal neuropathy) most characteristically presents with which symptom?

Severe unilateral thigh pain and weakness (Correct answer)
Loss of ankle reflexes only
Bilateral foot tingling
Foot drop

Correct answer: Severe unilateral thigh pain and weakness

Diabetic amyotrophy presents with acute, severe, often unilateral pain and weakness in the proximal leg muscles.

Question 6: What do people with HIV or AIDS sometimes develop from the treatment?

Osteopenia
Neuropathy (Correct answer)
Anemia
Pneumonia
Bone marrow suppression

Correct answer: Neuropathy

HIV/AIDS patients can develop neuropathy due to the virus itself or as a side effect of certain antiretroviral medications used to treat the condition. This treatment-induced neuropathy often manifests as pain, numbness, or tingling, particularly in the hands and feet.

Question 7: Which pathophysiological mechanism is central to hyperglycemia-induced nerve damage in diabetes?

Excess insulin signaling
Hypocalcemia-induced demyelination
Polyol pathway activation and oxidative stress (Correct answer)
Elevated LDL depositing in nerves

Correct answer: Polyol pathway activation and oxidative stress

Excess glucose enters the polyol pathway, depleting NADPH and increasing oxidative stress, which damages axons and Schwann cells.

Question 8: Which preventive foot care measure most effectively reduces amputation risk in patients with diabetic neuropathy?

Applying emollient creams between the toes
Soaking feet in warm water nightly
Daily application of antifungal cream
Daily foot inspection and protective footwear (Correct answer)

Correct answer: Daily foot inspection and protective footwear

Daily foot self-inspection combined with properly fitted protective footwear significantly reduces ulceration and amputation rates in diabetic neuropathy.

Question 9: What is the primary mechanism by which IVIG benefits patients with inflammatory neuropathies?

Replacement of antibodies depleted by autoimmune attack
Immune modulation through Fc receptor blockade, complement inhibition, and idiotype interactions (Correct answer)
Direct antibacterial action against triggering pathogens
Direct regeneration of damaged myelin sheaths

Correct answer: Immune modulation through Fc receptor blockade, complement inhibition, and idiotype interactions

IVIG exerts multiple immunomodulatory effects including Fc receptor blockade on macrophages, complement activation inhibition, and neutralization of pathogenic antibodies.

Question 10: Which symptom pattern best describes a small-fiber neuropathy?

Loss of vibration with brisk reflexes
Profound weakness with normal sensation
Pure muscle wasting
Burning pain and temperature loss with preserved strength and reflexes (Correct answer)

Correct answer: Burning pain and temperature loss with preserved strength and reflexes

Small-fiber neuropathy causes burning pain and thermal loss while strength and reflexes stay intact.

Question 11: Long-term heavy alcohol use causes neuropathy primarily through which mechanism?

Vasculitis of vasa nervorum
Autoimmune demyelination
Direct neurotoxicity and nutritional deficiency (Correct answer)
Compression by fatty tissue

Correct answer: Direct neurotoxicity and nutritional deficiency

Alcohol causes neuropathy through direct toxic effects on nerves combined with nutritional deficiencies, especially thiamine.

Question 12: Hypoglycemia unawareness in a diabetic patient with neuropathy occurs because autonomic damage blunts:

The need to eat
The adrenergic warning symptoms of low blood sugar (Correct answer)
All pain everywhere
Insulin production entirely

Correct answer: The adrenergic warning symptoms of low blood sugar

Autonomic neuropathy dulls the adrenergic warning signs (tremor, sweating, palpitations) of hypoglycemia.

Question 13: Charcot neuroarthropathy (Charcot foot) is a catastrophic complication of diabetic neuropathy affecting which structure?

Spinal cord
Skin of the foot
Peripheral blood vessels
Joints and bones of the foot (Correct answer)

Correct answer: Joints and bones of the foot

Charcot neuroarthropathy causes progressive destruction of joints and bones of the foot due to loss of protective sensation.

Question 14: Which nerve conduction finding suggests demyelinating neuropathy?

Slowed conduction velocity (Correct answer)
Faster reflexes
Increased muscle mass
Higher body temperature

Correct answer: Slowed conduction velocity

Demyelination strips the insulating myelin, slowing the speed of nerve signal conduction.

Question 15: A patient suddenly develops weakness and numbness confined to the distribution of a single nerve, such as wrist drop. This pattern is called:

Autonomic neuropathy
Symmetric polyneuropathy
Radiculopathy of all roots
Mononeuropathy (Correct answer)

Correct answer: Mononeuropathy

Mononeuropathy involves damage to a single peripheral nerve, producing localized signs.

Question 16: For neuropathy caused by alcohol use, which intervention is essential to treatment?

Increasing alcohol intake
Adding more sugar
Reducing water intake
Alcohol cessation (Correct answer)

Correct answer: Alcohol cessation

Stopping alcohol removes the toxic cause and is essential to managing alcoholic neuropathy.

Question 17: Which test is used to assess large fiber function in diabetic neuropathy screening?

Pinprick sensation test
10-g Semmes-Weinstein monofilament test (Correct answer)
Nerve biopsy
Warm/cold temperature discrimination

Correct answer: 10-g Semmes-Weinstein monofilament test

The 10-g Semmes-Weinstein monofilament detects loss of protective sensation by assessing large myelinated fiber function.

Question 18: Which gastrointestinal manifestation is most common in diabetic autonomic neuropathy?

Ulcerative colitis
Acute pancreatitis
Esophageal varices
Gastroparesis (Correct answer)

Correct answer: Gastroparesis

Gastroparesis, delayed gastric emptying due to vagal nerve dysfunction, is the most common GI manifestation of diabetic autonomic neuropathy.

Question 19: Which infection complication must be urgently treated to prevent osteomyelitis in a neuropathic foot ulcer?

Onychomycosis
Tinea pedis (athlete's foot)
Deep soft tissue or wound infection (Correct answer)
Viral plantar wart

Correct answer: Deep soft tissue or wound infection

Deep soft tissue infections in neuropathic foot ulcers can rapidly progress to osteomyelitis (bone infection), which often necessitates amputation.

Question 20: What is the medical term for the burning, tingling 'pins and needles' sensation common in neuropathy?

Apnea
Paresthesia (Correct answer)
Aphasia
Ataxia

Correct answer: Paresthesia

Paresthesia refers to abnormal sensations such as tingling, prickling, or burning.

Question 21: A lumbar puncture may be used in diagnosing neuropathy when which condition is suspected?

Mild dehydration
Simple muscle strain
Common cold
Inflammatory or autoimmune neuropathy (e.g., Guillain-Barré) (Correct answer)

Correct answer: Inflammatory or autoimmune neuropathy (e.g., Guillain-Barré)

Cerebrospinal fluid analysis helps diagnose inflammatory neuropathies like Guillain-Barré syndrome.

Question 22: A patient notices they cannot feel the temperature of bathwater accurately with their feet. Which fiber type is most likely affected?

Cranial nerve fibers
Small unmyelinated/thinly myelinated fibers (Correct answer)
Proprioceptive fibers only
Large myelinated motor fibers

Correct answer: Small unmyelinated/thinly myelinated fibers

Small fibers carry temperature and pain sensation, so their damage impairs thermal perception.

Question 23: Which nerve conduction study finding is most characteristic of diabetic polyneuropathy?

Reduced sural nerve sensory amplitude with slowed conduction velocity (Correct answer)
Fibrillation potentials in proximal muscles
Normal sensory responses with abnormal F-waves only
Conduction block in proximal segments

Correct answer: Reduced sural nerve sensory amplitude with slowed conduction velocity

The sural nerve sensory nerve action potential amplitude reduction with slowed velocity is the earliest and most sensitive NCS finding in diabetic polyneuropathy.

Question 24: Which antiretroviral drug class is most commonly associated with antiretroviral toxic neuropathy (ATN)?

Integrase inhibitors
Protease inhibitors
CCR5 antagonists
Nucleoside reverse transcriptase inhibitors (NRTIs) (Correct answer)

Correct answer: Nucleoside reverse transcriptase inhibitors (NRTIs)

Older NRTIs (stavudine, didanosine, zalcitabine) cause mitochondrial toxicity in peripheral nerves, producing a painful sensory neuropathy.

Question 25: Diabetic neuropathic cachexia is characterized by which combination of features?

Severe weight loss, depression, and painful neuropathy (Correct answer)
Foot drop, ankle weakness, and insomnia
Cranial nerve palsies and hypertension
Proximal weakness, fever, and elevated CRP

Correct answer: Severe weight loss, depression, and painful neuropathy

Diabetic neuropathic cachexia presents with profound weight loss, severe neuropathic pain, and depression, predominantly in older men.

Question 26: What is the most common form of diabetic neuropathy?

Distal symmetric polyneuropathy (Correct answer)
Autonomic neuropathy
Focal mononeuropathy
Proximal neuropathy

Correct answer: Distal symmetric polyneuropathy

Distal symmetric polyneuropathy is the most prevalent form, affecting the feet and hands in a stocking-glove pattern.

Question 27: Sudomotor function testing using the quantitative sudomotor axon reflex test (QSART) evaluates the function of which nerve fiber type?

Parasympathetic preganglionic fibers
Postganglionic sympathetic cholinergic small fibers (Correct answer)
Large myelinated sensory fibers
Motor fibers to skeletal muscle

Correct answer: Postganglionic sympathetic cholinergic small fibers

QSART measures sweat output to assess postganglionic sympathetic cholinergic small fiber integrity, providing an indirect measure of sudomotor autonomic function.

Question 28: What duration of symptoms distinguishes CIDP from Guillain-Barré Syndrome?

Symptoms lasting more than 2 weeks
Symptoms lasting more than 4 weeks
Symptoms lasting more than 8 weeks (Correct answer)
Symptoms lasting more than 6 months

Correct answer: Symptoms lasting more than 8 weeks

CIDP is defined by a progressive or relapsing course lasting more than 8 weeks, which differentiates it from the acute monophasic course of GBS.

Question 29: Which blood test is commonly ordered to rule out a reversible cause of neuropathy?

Vitamin B12 level (Correct answer)
Bone density scan
Pulmonary function test
Liver ultrasound

Correct answer: Vitamin B12 level

Vitamin B12 deficiency is a common, treatable cause of peripheral neuropathy.

Question 30: Duloxetine is FDA-approved for painful diabetic neuropathy and works primarily through which mechanism?

GABA-A receptor modulation
Serotonin-norepinephrine reuptake inhibition (Correct answer)
Sodium channel blockade
Opioid receptor agonism

Correct answer: Serotonin-norepinephrine reuptake inhibition

Duloxetine inhibits reuptake of serotonin and norepinephrine, enhancing descending pain inhibitory pathways.

Neuropathy Practice Test

Comprehensive assessment of neuropathy knowledge covering peripheral, diabetic, and autonomic neuropathy types, their signs and symptoms, pathophysiology, diagnosis, and clinical management — aligned with healthcare professional certification standards such as the CNRN exam.

Questions

35 min

Time Limit

70%

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