Parkinson's Parkinson's Sleep and Autonomic Function 1 — Questions and Answers
Question 1: Which sleep disorder is considered a prodromal marker of Parkinson's disease, sometimes appearing 10–15 years before motor symptoms?
- Insomnia
- Restless legs syndrome
- REM sleep behavior disorder (Correct answer)
- Obstructive sleep apnea
Correct answer: REM sleep behavior disorder
REM sleep behavior disorder (RBD), in which patients physically act out their dreams, is strongly linked to Parkinson's and can precede motor symptoms by a decade or more.
Question 2: What abnormality at the muscle level characterizes REM sleep behavior disorder (RBD)?
- Complete muscle paralysis during all sleep stages
- Loss of normal REM sleep muscle atonia (paralysis) (Correct answer)
- Involuntary muscle cramps during non-REM sleep
- Voluntary muscle control preserved during all sleep
Correct answer: Loss of normal REM sleep muscle atonia (paralysis)
Normally, muscles are paralyzed (atonic) during REM sleep to prevent dream enactment; in RBD this atonia is absent, allowing physical movements.
Question 3: Which of the following is the most common sleep complaint reported by Parkinson's disease patients?
- Inability to enter REM sleep at all
- Sleeping more than 12 hours per day
- Sudden sleep attacks during meals
- Frequent nighttime awakenings with difficulty returning to sleep (Correct answer)
Correct answer: Frequent nighttime awakenings with difficulty returning to sleep
Frequent nocturnal awakenings caused by motor symptoms, pain, nocturia, and medication wearing-off are the most prevalent sleep complaint in PD.
Question 4: Excessive daytime sleepiness (EDS) in Parkinson's disease is most strongly associated with which medication class?
- MAO-B inhibitors
- Anticholinergics
- Dopamine agonists (Correct answer)
- COMT inhibitors
Correct answer: Dopamine agonists
Dopamine agonists such as pramipexole and ropinirole are most frequently linked to excessive daytime sleepiness and sudden sleep attacks in PD.
Question 5: Sudden, irresistible 'sleep attacks' in Parkinson's disease are most often associated with which specific drug?
- Levodopa/carbidopa
- Pramipexole (a dopamine agonist) (Correct answer)
- Rasagiline
- Amantadine
Correct answer: Pramipexole (a dopamine agonist)
Pramipexole, a dopamine agonist, is among the drugs most commonly implicated in sudden sleep attacks and carries an FDA warning regarding this risk.
Question 6: Orthostatic hypotension is clinically defined as a drop in systolic blood pressure of at least how many mmHg within 3 minutes of standing?
- 10 mmHg
- 15 mmHg
- 20 mmHg (Correct answer)
- 30 mmHg
Correct answer: 20 mmHg
The standard clinical definition requires a drop of ≥20 mmHg systolic (or ≥10 mmHg diastolic) within 3 minutes of assuming an upright posture.
Question 7: Degeneration of which brain region is most directly responsible for the loss of REM sleep muscle atonia in Parkinson's-associated RBD?
- Substantia nigra pars compacta
- Hippocampus
- Thalamus
- Pontine tegmentum (subcoeruleus nucleus) (Correct answer)
Correct answer: Pontine tegmentum (subcoeruleus nucleus)
The subcoeruleus nucleus in the pontine tegmentum governs REM sleep atonia circuits; its degeneration in PD removes this paralysis and produces RBD.
Parkinson's Parkinson's Sleep and Autonomic Function 1
Which sleep disorder is considered a prodromal marker of Parkinson's disease, sometimes appearing 10–15 years before motor symptoms?