Neurology Practice Questions

Q: Febrile seizures occur most frequently in children of which age group?

Between six months and five years of age. ***Between six months and five years of age*** - Febrile seizures primarily occur in this age range when the developing brain is most susceptible to fever-induced neuronal hyperexcitability. - This period aligns with the peak incidence of common childhood infections that cause fever. *In the first month of life* - Seizures in the **neonatal period** (first month) are typically due to serious underlying neurological conditions, infections, or metabolic disturbances, rather than simple fever. - The brain's thermoregulatory mechanisms and seizure thresholds are different in neonates. *In the first six months of life* - While possible, febrile seizures are **less common** during the initial six months of life compared to the 6-month to 5-year window. - Seizures during this early period often warrant a more thorough investigation for other etiologies. *Between five and ten years of age* - The incidence of febrile seizures significantly **decreases** after age five, as the brain matures and becomes less prone to seizure activity in response to fever. - Seizures occurring in this age group, especially if recurrent with fever, might suggest an underlying epilepsy syndrome.

Q: Which of the following is a symptom of cerebral palsy?

Ataxia. ***Ataxia*** - **Ataxia** (lack of voluntary coordination of muscle movements) is one of the primary **motor symptoms of cerebral palsy**, specifically seen in **ataxic cerebral palsy** which accounts for 5-10% of CP cases. - Ataxic CP presents with **poor coordination, tremors, and balance difficulties**, representing a distinct motor presentation pattern. - It is a direct neurological symptom resulting from **cerebellar or basal ganglia involvement**. *Hypotonia* - **Hypotonia** (decreased muscle tone) can occur in cerebral palsy, particularly as an **early finding in infants**. - However, hypotonia often **evolves into other motor patterns** (spasticity, dyskinesia) as the child develops, making it less specific as a defining symptom. - While present in some forms, it's more transitional than a consistent motor symptom across CP types. *Microcephaly* - **Microcephaly** (abnormally small head) is not a symptom of cerebral palsy itself, but rather a potential **associated condition or underlying cause**. - It suggests **abnormal brain development** which *could* lead to cerebral palsy, rather than being a neurological motor symptom *of* CP. *Flaccid paralysis* - **Flaccid paralysis** involves complete **loss of muscle tone and voluntary movement**, characteristic of **lower motor neuron lesions**, **spinal cord injury**, or certain **neuromuscular diseases**. - Cerebral palsy is an **upper motor neuron disorder** typically presenting with **spasticity, dyskinesia, or ataxia**, rather than pure flaccid paralysis.

Q: The drug of choice for infantile spasms in a patient with tuberous sclerosis is:

Vigabatrin. ***Vigabatrin*** - **Vigabatrin** is considered the **first-line treatment** for **infantile spasms** associated with **tuberous sclerosis complex (TSC)**. - Its mechanism of action involves **irreversibly inhibiting GABA transaminase**, thereby increasing GABA levels in the brain. - It has shown **superior efficacy** in TSC-related infantile spasms compared to other antiepileptic drugs, with response rates of 70-95% in this specific population. - While ACTH (adrenocorticotropic hormone) is an alternative first-line agent for non-TSC infantile spasms, vigabatrin is specifically preferred in TSC due to its effectiveness and the underlying pathophysiology. *Lamotrigine* - While an effective **antiepileptic drug** for various seizure types, **lamotrigine** is not the primary choice for infantile spasms, especially in the context of TSC. - It works by blocking **voltage-gated sodium channels** and modulating calcium channels, but its efficacy for infantile spasms is generally lower than first-line options. - Lamotrigine is more commonly used for focal seizures and generalized tonic-clonic seizures. *Levetiracetam* - **Levetiracetam** is a broad-spectrum antiepileptic drug, but it is typically used as a **second-line or adjunctive therapy** for infantile spasms. - Its primary mechanism involves binding to the **synaptic vesicle protein 2A (SV2A)**, modulating neurotransmitter release. - While well-tolerated, it has not demonstrated the same level of efficacy as vigabatrin or ACTH for infantile spasms. *Tiagabine* - **Tiagabine** works by blocking the reuptake of **GABA** through GABA transporter 1 (GAT-1), thereby increasing GABAergic transmission. - It is **not indicated for infantile spasms** and is primarily used for focal seizures. - Tiagabine can sometimes precipitate or worsen non-convulsive status epilepticus and spike-wave stupor, making it inappropriate for this condition.

Q: What is the first-line treatment for West syndrome in a child with Tuberous Sclerosis?

Vigabatrin. ***Vigabatrin*** - For infants with **West syndrome** and confirmed **tuberous sclerosis complex (TSC)**, **vigabatrin** is the recommended first-line treatment. - It targets the **GABAergic system** and is particularly effective due to its mechanism of action related to the pathogenesis of seizures in TSC. *Valproate* - While a broad-spectrum **antiepileptic drug**, **valproate** is not the first-line choice for West syndrome, especially in the context of TSC. - It is associated with potential adverse effects, including **hepatic toxicity**, which can be a concern in young children. *ACTH* - **Adrenocorticotropic hormone (ACTH)** is a highly effective treatment for **West syndrome** in general, especially when the etiology is unknown or not related to TSC. - However, due to its significant side effects and the specific efficacy of vigabatrin in TSC, **ACTH** is typically considered second-line for TSC-associated West syndrome. *Lamotrigine* - **Lamotrigine** is an antiepileptic drug that is generally not used as a first-line treatment for **West syndrome**, regardless of the underlying etiology. - It can sometimes **exacerbate infantile spasms** in some cases, making it an unsuitable initial choice.

Question 1

Febrile seizures occur most frequently in children of which age group?

Accepted Answer

Between six months and five years of age

Answer

In the first month of life

Answer

In the first six months of life

Answer

Between five and ten years of age

Question 2

Which of the following is a symptom of cerebral palsy?

Accepted Answer

Ataxia

Answer

Microcephaly

Answer

Hypotonia

Answer

Flaccid paralysis

Question 3

The drug of choice for infantile spasms in a patient with tuberous sclerosis is:

Accepted Answer

Vigabatrin

Answer

Lamotrigine

Answer

Levetiracetam

Answer

Tiagabine

Question 4

What is the first-line treatment for West syndrome in a child with Tuberous Sclerosis?

Accepted Answer

Vigabatrin

Answer

Valproate

Answer

ACTH

Answer

Lamotrigine

Neurology — MCQs

Neurology — MCQs

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