Narcolepsy — MCQs
Child wakes up at night sweating and terrified, does not remember the episode - diagnosis?
Modafinil is approved by FDA for treatment of all except:
Narcolepsy is associated with?
Which condition is associated with periodic discharges on EEG at 4-second intervals?
What is the primary characteristic of narcolepsy?
Which of the following statements about narcolepsy is false?
Which of the following statements about narcolepsy is false?
Who is known as the father of modern psychiatry?
Bruxism most commonly occurs during which phase of sleep?
What is a feature of narcolepsy?
Narcolepsy Indian Medical PG Practice Questions and MCQs
Question 1: Child wakes up at night sweating and terrified, does not remember the episode - diagnosis?
- A. Narcolepsy
- B. Nightmares
- C. Night terrors (Correct Answer)
- D. Somnambulism
Explanation: ***Night terrors*** - **Night terrors** are characterized by partial arousals from **deep non-REM sleep** (typically N3 stage), often accompanied by loud screams, thrashing, and autonomic symptoms like sweating and tachycardia. - The child is very difficult to awaken or comfort during an episode and, crucially, has **no memory of the event** upon waking, which differentiates it from nightmares. *Narcolepsy* - **Narcolepsy** is a chronic neurological condition characterized by overwhelming daytime **sleepiness** and sudden attacks of sleep. - It often involves **cataplexy** (sudden loss of muscle tone triggered by strong emotions) and **hypnagogic/hypnopompic hallucinations**, which are not described. *Nightmares* - **Nightmares** are vivid, frightening dreams that occur during **REM sleep** and typically result in full awakening and the ability to **recall the dream content**. - While they cause fear and distress, episodes do not usually involve the terrified unresponsiveness or lack of recall seen in night terrors. *Somnambulism* - **Somnambulism** (sleepwalking) occurs during **deep non-REM sleep**, and affected individuals may perform complex actions while partially aroused. - While there is amnesia for the event, prominent features like **sweating and intense terror** are not typical components of sleepwalking.
Question 2: Modafinil is approved by FDA for treatment of all except:
- A. Narcolepsy
- B. Shift work sleep disorder (SWSD)
- C. Obstructive sleep apnea syndrome (OSAS)
- D. Lethargy in depression (Correct Answer)
Explanation: ***Lethargy in depression*** - Modafinil is **not FDA-approved** for treating lethargy or fatigue specifically in the context of depression. Its primary indications are for disorders of excessive daytime sleepiness. - While it may be used off-label in some cases for depression-related fatigue, it lacks formal FDA approval and specific efficacy data for this indication. *Narcolepsy* - Modafinil is **FDA-approved** as a wakefulness-promoting agent for the treatment of excessive daytime sleepiness associated with **narcolepsy**. - It helps reduce the frequency and severity of sleep attacks by promoting wakefulness through effects on **dopamine**, **norepinephrine**, and **histamine** systems in the brain. *Shift work sleep disorder (SWSD)* - Modafinil is **FDA-approved** to improve wakefulness in patients with excessive sleepiness associated with **shift work sleep disorder**. - It helps individuals working non-traditional hours (night shifts, rotating shifts) maintain alertness during their work periods. *Obstructive sleep apnea syndrome (OSAS)* - Modafinil is **FDA-approved** as an **adjunctive treatment** for residual excessive daytime sleepiness in patients with **obstructive sleep apnea/hypopnea syndrome (OSAHS)** who are receiving adequate treatment with CPAP. - It addresses persistent sleepiness that remains even after appropriate primary airway management.
Question 3: Narcolepsy is associated with?
- A. Late age of onset
- B. Hypnagogic hallucination (Correct Answer)
- C. Decreased NREM sleep
- D. Normal sleep architecture
Explanation: ***Hypnagogic hallucination*** - **Hypnagogic hallucinations** are vivid, dream-like perceptual experiences occurring at **sleep onset** and are one of the **classic tetrad features** of narcolepsy. - They occur in **30-60% of narcolepsy patients** and result from the intrusion of **REM sleep phenomena** into the transition from wakefulness to sleep. - These hallucinations reflect the **REM sleep dysregulation** that is central to narcolepsy pathophysiology. - Other tetrad features include **excessive daytime sleepiness, cataplexy, and sleep paralysis**. *Late age of onset* - Narcolepsy typically has an **early age of onset**, most commonly between **10-25 years** (adolescence and young adulthood). - Peak onset is around **15 years of age**. - Late-onset narcolepsy is uncommon and may suggest secondary causes. *Normal sleep architecture* - Narcolepsy is characterized by **disrupted sleep architecture**, not normal architecture. - Key abnormalities include **sleep-onset REM periods (SOREMPs)**, where patients enter REM sleep within **15 minutes** of sleep onset, bypassing normal NREM stages. - Nocturnal sleep is **fragmented** with frequent awakenings. *Decreased NREM sleep* - While narcolepsy involves **REM sleep dysregulation** with premature REM entry, characterizing it simply as "decreased NREM sleep" is not the standard clinical description. - The primary pathology is **abnormal REM sleep timing and distribution**, including SOREMPs during daytime naps and nighttime sleep. - The focus is on **REM sleep intrusion** rather than NREM reduction per se.
Question 4: Which condition is associated with periodic discharges on EEG at 4-second intervals?
- A. SSPE (Correct Answer)
- B. Absence Seizure
- C. REM sleep disorder
- D. Focal epilepsy
Explanation: ***SSPE*** - **Subacute sclerosing panencephalitis (SSPE)** is a rare, fatal, progressive brain disorder characterized by inflammation and degeneration of the brain. - The distinctive EEG pattern consists of **periodic high-amplitude, slow-wave complexes** that recur every 4-15 seconds, often every 4-8 seconds, making 4-second intervals a key indicator. *Absence Seizure* - Absence seizures typically manifest as **brief staring spells** with impaired consciousness, lasting only a few seconds. - The EEG in absence seizures shows characteristic **generalized 3-Hz spike-and-wave discharges**, not 4-second interval periodic discharges. *REM sleep disorder* - **REM sleep behavior disorder** involves the acting out of vivid dreams due to the absence of normal muscle atonia during REM sleep [1]. - EEG in REM sleep behavior disorder shows normal sleep architecture but may include evidence of **muscle activity (EMG)** during REM sleep, not periodic discharges [1]. *Focal epilepsy* - **Focal epilepsy** originates in a specific area of the brain, causing seizures with symptoms dependent on the affected region [2]. - EEG findings in focal epilepsy typically show **interictal spikes or sharp waves** localized to the region of seizure onset, which are distinct from generalized periodic discharges [2].
Question 5: What is the primary characteristic of narcolepsy?
- A. Sleep terrors
- B. Sleep walking
- C. Excessive daytime sleepiness (Correct Answer)
- D. Sleeptalking
Explanation: **Excessive daytime sleepiness** - **Excessive daytime sleepiness (EDS)** is the hallmark symptom of narcolepsy, often manifesting as an irresistible urge to sleep, even after adequate nighttime sleep. - This **sleepiness** can lead to sudden sleep attacks during inappropriate times, impacting daily activities and safety. - EDS is present in virtually all cases of narcolepsy and is the **primary diagnostic criterion**. *Sleep terrors* - **Sleep terrors** are a parasomnia characterized by sudden awakening in a state of fear and confusion, often accompanied by screaming or thrashing, and are distinct from narcolepsy. - They typically occur during **non-rapid eye movement (NREM) sleep** and the individual usually has no memory of the event. *Sleep walking* - **Sleepwalking** (somnambulism) is another parasomnia where individuals perform complex behaviors while asleep, such as walking or talking, without conscious awareness. - It occurs during **deep NREM sleep** and is not a primary characteristic of narcolepsy. *Sleeptalking* - **Sleeptalking** (somniloquy) involves speaking while asleep and is a common, generally benign parasomnia that can occur during any sleep stage. - While it can be a symptom of various sleep disorders, it is not the defining feature of narcolepsy.
Question 6: Which of the following statements about narcolepsy is false?
- A. Loss of muscle tone
- B. Hallucination
- C. Cataplexy
- D. Sleep architecture normal (Correct Answer)
Explanation: ***Sleep architecture normal*** ✓ **This is the FALSE statement** - Narcolepsy is characterized by **abnormal sleep architecture**, specifically an **abbreviated latency to REM sleep** (often <15 minutes, compared to normal 90 minutes). - Patients experience **fragmented nighttime sleep** with frequent awakenings and difficulty maintaining continuous sleep. - Sleep studies show **disrupted sleep-wake cycles** and **premature entry into REM sleep**. *Loss of muscle tone* - TRUE statement - **Loss of muscle tone** is the defining feature of **cataplexy**, a hallmark symptom of narcolepsy type 1. - Sudden emotional triggers (laughter, surprise, anger) lead to muscle weakness or paralysis without loss of consciousness. - This reflects neurological dysfunction affecting muscle control regulation during wakefulness. *Hallucination* - TRUE statement - **Hypnagogic hallucinations** (upon falling asleep) and **hypnopompic hallucinations** (upon waking) are common in narcolepsy. - These vivid, dream-like experiences occur during sleep-wake transitions due to intrusion of REM sleep phenomena into wakefulness. - Can involve visual, auditory, or tactile sensations. *Cataplexy* - TRUE statement - **Cataplexy** is a hallmark symptom of **narcolepsy type 1** (narcolepsy with cataplexy). - Involves sudden, brief episodes of bilateral muscle weakness or paralysis triggered by strong emotions. - Results from loss of hypocretin (orexin) neurons in the hypothalamus.
Question 7: Which of the following statements about narcolepsy is false?
- A. Day dreaming (Correct Answer)
- B. Cataplexy
- C. Sudden sleep and decreased REM latency
- D. Hypnagogic hallucinations
Explanation: ***Day dreaming*** - While people with narcolepsy experience excessive daytime sleepiness, **daydreaming** is a normal cognitive process and not a characteristic symptom of narcolepsy. - Narcolepsy involves **irresistible urges to sleep** or sudden sleep attacks, which are distinct from simply daydreaming. *Hypnagogic hallucinations* - These are **vivid, often frightening hallucinations** that occur as a person is falling asleep. - They are a common symptom of narcolepsy, along with hypnopompic hallucinations (occurring upon waking). *Cataplexy* - **Cataplexy** is a sudden, brief loss of voluntary muscle tone, often triggered by strong emotions like laughter or anger. - It is a hallmark symptom of **Type 1 narcolepsy** and is caused by the intrusion of REM sleep atonia into wakefulness. *Sudden sleep and decreased REM latency* - Individuals with narcolepsy experience **sudden and irresistible sleep attacks** during the day. - They also have **decreased REM latency**, meaning they enter REM sleep much faster than usual, often within minutes of falling asleep.
Question 8: Who is known as the father of modern psychiatry?
- A. Bleuler
- B. Freud
- C. Kraepelin
- D. Philippe Pinel (Correct Answer)
Explanation: ***Philippe Pinel*** - **Philippe Pinel** is widely regarded as the **father of modern psychiatry** due to his revolutionary reforms in the treatment of the mentally ill in the late 18th and early 19th centuries - He advocated for a more humane approach, removing chains from patients and emphasizing **moral treatment**, which laid the foundation for modern psychiatric care - His work at Bicêtre Hospital (1793) and Salpêtrière Hospital marked a paradigm shift from custodial care to therapeutic intervention *Bleuler* - **Eugen Bleuler** is known for coining the term **"schizophrenia"** (1911) and describing its fundamental symptoms (the "four A's": associations, affect, ambivalence, autism) - While his contributions were significant in understanding and classifying mental illness, he built upon the foundations of humane psychiatric care already laid by Pinel *Freud* - **Sigmund Freud** is considered the **father of psychoanalysis**, a distinct therapeutic approach and theory of personality - His work focused on the unconscious mind, defense mechanisms, and psychosexual development, which are central to psychoanalytic theory but not the foundational shift in psychiatric care management that Pinel initiated *Kraepelin* - **Emil Kraepelin** is often referred to as the **father of modern psychiatric classification** due to his systematic approach to categorizing mental disorders based on their clinical course and outcome (dementia praecox vs manic-depressive illness) - His work profoundly influenced the development of diagnostic manuals like the DSM, but his focus was on nosology and classification rather than the initial humane treatment reform
Question 9: Bruxism most commonly occurs during which phase of sleep?
- A. REM sleep
- B. NREM Stage I
- C. NREM Stage II (Correct Answer)
- D. NREM Stage III
Explanation: **Explanation:** **Sleep Bruxism** is a sleep-related movement disorder characterized by the involuntary grinding or clenching of teeth. **Why NREM Stage II is correct:** While bruxism can occur in any stage of sleep, it is most frequently observed during **NREM Stage II (Light Sleep)**. Statistically, about 80% of bruxism episodes occur during NREM sleep, with the vast majority clustered in Stage II. These episodes are often associated with "micro-arousals"—brief shifts in sleep depth where the sympathetic nervous system activity increases, leading to rhythmic masticatory muscle activity (RMMA). **Analysis of Incorrect Options:** * **REM Sleep (A):** Although bruxism can occur during REM, it is less common. REM-related bruxism is often associated with more severe clinical symptoms and may be linked to obstructive sleep apnea. * **NREM Stage I (B):** This is a transitional phase of very light sleep. While grinding can occur here, the frequency is significantly lower than in Stage II. * **NREM Stage III (D):** Also known as Slow Wave Sleep (SWS) or deep sleep. Parasomnias like sleepwalking (somnambulism) and night terrors typically occur here, but bruxism is less frequent in this stage compared to Stage II. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of Choice:** The first-line management is usually **stress reduction** and **dental guards (occlusal splints)** to prevent tooth wear. * **Pharmacotherapy:** If severe, **Benzodiazepines** (like Clonazepam) or muscle relaxants may be used short-term. * **Association:** Bruxism is frequently associated with stress, anxiety, and other sleep disorders like Obstructive Sleep Apnea (OSA). * **Key Distinction:** Do not confuse bruxism (Stage II) with **Sleep Terrors/Somnambulism**, which are classic **Stage III (N3)** phenomena.
Question 10: What is a feature of narcolepsy?
- A. Insomnia
- B. Hypersomnia during the day (Correct Answer)
- C. Bruxism
- D. Somnambulism
Explanation: **Explanation:** **Narcolepsy** is a chronic neurological disorder characterized by the brain's inability to regulate sleep-wake cycles normally. The hallmark feature is **excessive daytime sleepiness (EDS)** or hypersomnia, where patients experience an irrepressible need to sleep or "sleep attacks" regardless of the amount of sleep they get at night. This occurs due to the loss of orexin (hypocretin)-producing neurons in the hypothalamus, which are responsible for maintaining wakefulness. **Analysis of Options:** * **Option B (Correct):** Hypersomnia is the primary symptom. Patients often enter REM sleep directly from wakefulness (SOREMPs), leading to refreshing but short naps. * **Option A:** Insomnia refers to difficulty initiating or maintaining sleep. While narcoleptics may have fragmented nocturnal sleep, the defining diagnostic feature is daytime hypersomnia. * **Option C:** Bruxism (teeth grinding) is a sleep-related movement disorder, not a primary feature of narcolepsy. * **Option D:** Somnambulism (sleepwalking) is a NREM parasomnia. Narcolepsy is primarily associated with REM sleep dysregulation. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Tetrad:** 1. Excessive Daytime Sleepiness, 2. **Cataplexy** (sudden loss of muscle tone triggered by emotions—most specific sign), 3. Sleep Paralysis, and 4. Hypnagogic/Hypnopompic hallucinations. * **Diagnosis:** Gold standard is the **Multiple Sleep Latency Test (MSLT)** showing a mean sleep latency <8 minutes and ≥2 SOREMPs. * **Treatment:** Modafinil (first-line for EDS); Sodium Oxybate (effective for both EDS and cataplexy).
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