|  | Healthcare Industry | PPOs

Periodic Limb Movement Syndrome (PLMS): Symptoms, Causes, and Treatment

PLMS = repetitive, stereotyped limb movements during sleep (mostly legs), occurring in NREM stages N1–N2, every 20–40 seconds, lasting 0.5–5 sec each.

Diagnostic Criteria (ICSD-3)

  • ≥15 events/hour (adults) / ≥5/hr (children) on polysomnography.
  • Not better explained by another sleep disorder, medication, or medical condition.

Associations

  • Restless Legs Syndrome (RLS): 80–90% of RLS patients have PLMS.
  • Iron deficiency (ferritin <50–75 µg/L).
  • Renal failure (uremic neuropathy).
  • Medications: Antidepressants (SSRIs, SNRIs, TCAs), antihistamines, dopamine antagonists.
  • Neurodegenerative: Parkinson's, MSA.

Clinical Impact

  • Sleep fragmentation → excessive daytime sleepiness, fatigue, cognitive impairment.
  • Cardiovascular surges (BP/HR spikes) → long-term CV risk.

Management

  1. Treat underlying cause (iron repletion, medication review).
  2. Dopamine agonists (pramipexole, ropinirole) — first-line if symptomatic.
  3. Gabapentin/pregabalin (especially with pain/RLS).
  4. Clonazepam (caution: sedation, falls).
  5. Opioids (refractory, low-dose).

PPOs - Related Articles