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Night-to-night variability of periodic leg movements during sleep in restless legs syndrome and periodic limb movement disorder: comparison between the periodicity index and the PLMS index.
Sleep Med. 2013 Mar; 14(3):293-6.SM

Abstract

BACKGROUND

The number of periodic leg movements during sleep (PLMS index) shows high night-to-night variability, requiring multiple nights for its reliable estimation. It is currently not known if this is also the case for the degree of periodicity of leg movements, quantified by the Periodicity index.

OBJECTIVE

To compare night-to-night variability of PLMS and Periodicity indices in patients with restless legs syndrome (RLS) or periodic limb movement disorder (PLMD).

METHODS

Eighteen idiopathic RLS patients and 9 PLMD patients were recruited. Subjects underwent two consecutive full night polysomnographic studies. Polysomnographic recordings were scored and leg movement activity analyzed during sleep for the computation of the PLMS and Periodicity indices.

RESULTS

In both patient groups, the Periodicity index showed a significantly lower degree of variability than that of PLMS index, being >6.5 times lower in RLS patients and 2 times lower in PLMD patients.

CONCLUSIONS

These data support the use of the Periodicity index in the evaluation of PLMS in RLS and PLMD and indicate that this parameter seems to be more stable than the widely used PLMS index which has higher night-to-night variability.

Authors+Show Affiliations

Sleep Research Centre, Department of Neurology I.C., Oasi Institute for Research on Mental Retardation and Brain Aging (IRCCS), Troina, Italy. rferri@oasi.en.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23068780

Citation

Ferri, Raffaele, et al. "Night-to-night Variability of Periodic Leg Movements During Sleep in Restless Legs Syndrome and Periodic Limb Movement Disorder: Comparison Between the Periodicity Index and the PLMS Index." Sleep Medicine, vol. 14, no. 3, 2013, pp. 293-6.
Ferri R, Fulda S, Manconi M, et al. Night-to-night variability of periodic leg movements during sleep in restless legs syndrome and periodic limb movement disorder: comparison between the periodicity index and the PLMS index. Sleep Med. 2013;14(3):293-6.
Ferri, R., Fulda, S., Manconi, M., Högl, B., Ehrmann, L., Ferini-Strambi, L., & Zucconi, M. (2013). Night-to-night variability of periodic leg movements during sleep in restless legs syndrome and periodic limb movement disorder: comparison between the periodicity index and the PLMS index. Sleep Medicine, 14(3), 293-6. https://doi.org/10.1016/j.sleep.2012.08.014
Ferri R, et al. Night-to-night Variability of Periodic Leg Movements During Sleep in Restless Legs Syndrome and Periodic Limb Movement Disorder: Comparison Between the Periodicity Index and the PLMS Index. Sleep Med. 2013;14(3):293-6. PubMed PMID: 23068780.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Night-to-night variability of periodic leg movements during sleep in restless legs syndrome and periodic limb movement disorder: comparison between the periodicity index and the PLMS index. AU - Ferri,Raffaele, AU - Fulda,Stephany, AU - Manconi,Mauro, AU - Högl,Birgit, AU - Ehrmann,Laura, AU - Ferini-Strambi,Luigi, AU - Zucconi,Marco, Y1 - 2012/10/12/ PY - 2012/06/26/received PY - 2012/08/04/revised PY - 2012/08/06/accepted PY - 2012/10/17/entrez PY - 2012/10/17/pubmed PY - 2013/8/21/medline SP - 293 EP - 6 JF - Sleep medicine JO - Sleep Med VL - 14 IS - 3 N2 - BACKGROUND: The number of periodic leg movements during sleep (PLMS index) shows high night-to-night variability, requiring multiple nights for its reliable estimation. It is currently not known if this is also the case for the degree of periodicity of leg movements, quantified by the Periodicity index. OBJECTIVE: To compare night-to-night variability of PLMS and Periodicity indices in patients with restless legs syndrome (RLS) or periodic limb movement disorder (PLMD). METHODS: Eighteen idiopathic RLS patients and 9 PLMD patients were recruited. Subjects underwent two consecutive full night polysomnographic studies. Polysomnographic recordings were scored and leg movement activity analyzed during sleep for the computation of the PLMS and Periodicity indices. RESULTS: In both patient groups, the Periodicity index showed a significantly lower degree of variability than that of PLMS index, being >6.5 times lower in RLS patients and 2 times lower in PLMD patients. CONCLUSIONS: These data support the use of the Periodicity index in the evaluation of PLMS in RLS and PLMD and indicate that this parameter seems to be more stable than the widely used PLMS index which has higher night-to-night variability. SN - 1878-5506 UR - https://www.unboundmedicine.com/medline/citation/23068780/Night_to_night_variability_of_periodic_leg_movements_during_sleep_in_restless_legs_syndrome_and_periodic_limb_movement_disorder:_comparison_between_the_periodicity_index_and_the_PLMS_index_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1389-9457(12)00324-3 DB - PRIME DP - Unbound Medicine ER -