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Cyclic alternating pattern as a provocative factor in nocturnal paroxysmal dystonia
M G Terzano1, M F Monge-Strauss, F Mikol
1Sleep Disorders Center, Department of Neurology, University of Parma, Italy.
Epilepsia
|May 14, 1998
Summary
Nocturnal paroxysmal dystonia (NPD) is linked to unstable non-REM sleep, indicated by increased cyclic alternating pattern (CAP) rates. Medication reducing motor attacks also decreased CAP rates, suggesting CAP
Area of Science:
- Neurology
- Sleep Medicine
- Movement Disorders
Background:
- Nocturnal paroxysmal dystonia (NPD) presents with stereotyped, generalized movements during sleep.
- Distinguishing NPD from epileptic seizures is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To investigate the relationship between cyclic alternating pattern (CAP) and nocturnal motor events in patients with NPD.
- To compare CAP parameters in NPD patients with age- and sex-matched controls.
Main Methods:
- Polygraphic recordings were performed on 6 NPD patients and controls.
- Sleep architecture and CAP parameters were analyzed.
- The effect of medication on motor attacks and CAP was assessed.
Main Results:
- NPD patients exhibited significantly higher CAP rates compared to controls.
- Motor events in NPD were associated with unstable non-REM sleep and CAP.
- Sleep latency was increased in NPD patients.
- Medication reduced motor attacks and normalized CAP rates, regularizing sleep architecture.
Conclusions:
- Cyclic alternating pattern (CAP) plays a modulatory role in nocturnal motor events associated with NPD.
- CAP analysis provides valuable insights into the pathophysiology of NPD.
- Targeting CAP may offer therapeutic potential for managing NPD.