Commonalities and Differences in NREM Parasomnias and Sleep-Related Epilepsy: Is There a Continuum Between the Two Conditions?

被引:17
作者
Mutti, Carlotta [1 ]
Bernabe, Giorgia [1 ]
Barozzi, Noemi [1 ]
Ciliento, Rosario [1 ]
Trippi, Irene [1 ]
Pedrazzi, Giuseppe [2 ,3 ]
Azzi, Nicoletta [1 ]
Parrino, Liborio [1 ]
机构
[1] Univ Parma, Sleep Disorders Ctr, Dept Med & Surg, Parma, Italy
[2] Univ Parma, Unit Neurosci, Parma, Italy
[3] Univ Parma, Interdept Ctr Robust Stat, Dept Med & Surg, Parma, Italy
来源
FRONTIERS IN NEUROLOGY | 2020年 / 11卷
关键词
disorders of arousal; parasomnia; sleep-related hypermotor epilepsy; SHE; cyclic alternating pattern; CAP; sleep microstructure; FRONTAL-LOBE EPILEPSY; CYCLIC ALTERNATING PATTERN; MOTOR EVENTS; POLYSOMNOGRAPHIC ANALYSIS; AROUSAL PARASOMNIAS; DIAGNOSTIC-CRITERIA; SOMNAMBULISM; CAP; DISORDERS; SEIZURES;
D O I
10.3389/fneur.2020.600026
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Introduction: Differential diagnosis between disorders of arousal (DoA) and sleep-related hypermotor epilepsy (SHE) often represents a clinical challenge. The two conditions may be indistinguishable from a semiological point of view and the scalp video-polysomnography is often uninformative. Both disorders are associated with variable hypermotor manifestations ranging from major events to fragments of a hierarchical continuum of increasing intensity, complexity, and duration. Given their semiological overlap we decided to explore the sleep texture of DoA and SHE seeking for similarities and differences. Methods: We analyzed sleep macrostructure and CAP (cyclic alternating pattern) parameters in a cohort of 35 adult DoA patients, 40 SHE patients and 24 healthy sleepers, all recorded and scored in the same sleep laboratory. Nocturnal behavioral manifestations included minor motor events, paroxysmal arousals and major attacks in SHE, and simple, rising, or complex arousal movements in DoA. Results: Compared to healthy controls, DoA and SHE showed similar amounts of sleep efficiency, light sleep, deep sleep, REM sleep, CAP subtypes. Both groups also showed slow wave sleep fragmentation and an increased representation of stage N3 in the second part of the night. The only discriminating elements between the two conditions regarded sleep length (more reduced in DoA) and sleep instability (more elevated in SHE). In DoA recordings, all motor episodes arose from NREM sleep: 37% during light NREM stages and 63% during stage N3 (simple arousal movements: 94%). In SHE recordings, 57% of major attacks occurred during stage N3. Conclusions: So far, emphasis has been placed on the differentiation of sleep-related epilepsy and NREM arousal disorders. However, the impressive analogies between DoA and SHE suggest the existence of an underestimated continuum across the conditions, linked by increased levels of sleep instability, higher amounts of slow wave sleep and NREM/REM sleep imbalance. Sleep texture is extremely similar in the two conditions, although CAP metrics disclose quantitative differences. In particular, SHE patients show a higher arousal instability compared to DoA subjects. Given their clinical and epidemiological overlap, a common genetic background is also hypothesized. In such a perspective, we suggest that the consolidated dichotomy DoA vs. SHE should be reappraised.
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页数:14
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