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Improved computation of the atonia index in normal controls and patients with REM sleep behavior disorder.
Ferri R, Rundo F, Manconi M, Plazzi G, Bruni O, Oldani A, Ferini-Strambi L, Zucconi M. Ferri R, et al. Sleep Med. 2010 Oct;11(9):947-9. doi: 10.1016/j.sleep.2010.06.003. Sleep Med. 2010. PMID: 20817596
OBJECTIVE: The aim of this study was to evaluate the effects of a simple method of noise reduction before the calculation of the REM sleep atonia index (AI) on a large number of recordings from different normal controls and patient groups. ...CONCLUSIONS: After the …
OBJECTIVE: The aim of this study was to evaluate the effects of a simple method of noise reduction before the calculation of the REM sleep …
REM sleep without atonia with REM sleep-related motor events: broadening the spectrum of REM sleep behavior disorder.
Ferri R, Aricò D, Cosentino FII, Lanuzza B, Chiaro G, Manconi M. Ferri R, et al. Sleep. 2018 Dec 1;41(12). doi: 10.1093/sleep/zsy187. Sleep. 2018. PMID: 30239958
RESULTS: RBDSQ and RBDQ-HK were both higher in participants with low Atonia Index than in those with high Atonia Index, as well as number of drugs taken and number of comorbidities. No effect of antidepressant use was found on Atonia Index
RESULTS: RBDSQ and RBDQ-HK were both higher in participants with low Atonia Index than in those with high Atonia Ind
Isolated rapid eye movement sleep without atonia in amyotrophic lateral sclerosis.
Puligheddu M, Congiu P, Aricò D, Rundo F, Borghero G, Marrosu F, Fantini ML, Ferri R. Puligheddu M, et al. Sleep Med. 2016 Oct;26:16-22. doi: 10.1016/j.sleep.2016.05.016. Epub 2016 Oct 11. Sleep Med. 2016. PMID: 28007355
None of the leg PLMS parameters were different between the ALS patients and controls. The REM atonia index was significantly decreased in the ALS patients, and the number of chin movements/hour tended to increase. Both REM atonia index and number of ch …
None of the leg PLMS parameters were different between the ALS patients and controls. The REM atonia index was significantly d …
Facilitatory/inhibitory intracortical imbalance in REM sleep behavior disorder: early electrophysiological marker of neurodegeneration?
Lanza G, Aricò D, Lanuzza B, Cosentino FII, Tripodi M, Giardina F, Bella R, Puligheddu M, Pennisi G, Ferri R, Pennisi M. Lanza G, et al. Sleep. 2020 Mar 12;43(3):zsz242. doi: 10.1093/sleep/zsz242. Sleep. 2020. PMID: 31599326

Compared to controls, patients exhibited a significant decrease of ICF (median 0.8, range 0.5-1.4 vs. 1.9, range 1.4-2.3; p < 0.01) and a clear trend, though not significant, towards a reduction of SICI (median 0.55, range 0.1-1.4 vs. 0.25, range 0.1-0.3), with a large effect

Compared to controls, patients exhibited a significant decrease of ICF (median 0.8, range 0.5-1.4 vs. 1.9, range 1.4-2.3; p < 0.01) and a

Normative and isolated rapid eye movement sleep without atonia in adults without REM sleep behavior disorder.
Feemster JC, Jung Y, Timm PC, Westerland SM, Gossard TR, Teigen LN, Buchal LA, Cattaneo EFD, Imlach CA, Mccarter SJ, Smith KL, Boeve BF, Silber MH, St Louis EK. Feemster JC, et al. Sleep. 2019 Oct 9;42(10):zsz124. doi: 10.1093/sleep/zsz124. Sleep. 2019. PMID: 31587043 Free PMC article.
STUDY OBJECTIVES: Values for normative REM sleep without atonia (RSWA) remain unclear. Older age and male sex are associated with greater RSWA, and isolated elevated RSWA has been reported. ...METHODS: We visually quantified phasic, "any," and tonic RSWA in the submentalis …
STUDY OBJECTIVES: Values for normative REM sleep without atonia (RSWA) remain unclear. Older age and male sex are associated with gre …
REM Sleep without atonia correlates with abnormal vestibular-evoked myogenic potentials in isolated REM sleep behavior disorder.
Puligheddu M, Figorilli M, Serra A, Laccu I, Congiu P, Tamburrino L, de Natale ER, Ginatempo F, Deriu F, Loi G, Fantini ML, Schenck CH, Ferri R. Puligheddu M, et al. Sleep. 2019 Sep 6;42(9):zsz128. doi: 10.1093/sleep/zsz128. Sleep. 2019. PMID: 31310647
STUDY OBJECTIVES: The neurophysiological hallmark of REM sleep behavior disorder (RBD) is loss of atonia during REM sleep. Indeed, signs and symptoms of neurodegeneration can occur after years, even decades, from its beginning. ...Moreover, VEMP score was negatively correl …
STUDY OBJECTIVES: The neurophysiological hallmark of REM sleep behavior disorder (RBD) is loss of atonia during REM sleep. Indeed, si …
Night-to-night variability of automatic quantitative parameters of the chin EMG amplitude (Atonia Index) in REM sleep behavior disorder.
Ferri R, Marelli S, Cosentino FI, Rundo F, Ferini-Strambi L, Zucconi M. Ferri R, et al. J Clin Sleep Med. 2013 Mar 15;9(3):253-8. doi: 10.5664/jcsm.2490. J Clin Sleep Med. 2013. PMID: 23493642 Free PMC article.
STUDY OBJECTIVES: To analyze the night-to-night variability of REM sleep electromyographic (EMG) features of REM sleep behavior disorder (RBD) by using the automatic quantitative method known as atonia index (AI), and to evaluate the improvement in sensitivity and s …
STUDY OBJECTIVES: To analyze the night-to-night variability of REM sleep electromyographic (EMG) features of REM sleep behavior disorder (RB …
Comparison between an automatic and a visual scoring method of the chin muscle tone during rapid eye movement sleep.
Ferri R, Gagnon JF, Postuma RB, Rundo F, Montplaisir JY. Ferri R, et al. Sleep Med. 2014 Jun;15(6):661-5. doi: 10.1016/j.sleep.2013.12.022. Epub 2014 Mar 5. Sleep Med. 2014. PMID: 24831249 Clinical Trial.
For the computer quantitative analysis we used the automatic scoring algorithm known as the atonia index (abnormal, <0.8). The percentage correct classification, sensitivity, specificity, and Cohen kappa were calculated. ...The agreement between atonia
For the computer quantitative analysis we used the automatic scoring algorithm known as the atonia index (abnormal, <0.8). …
A quantitative statistical analysis of the submentalis muscle EMG amplitude during sleep in normal controls and patients with REM sleep behavior disorder.
Ferri R, Manconi M, Plazzi G, Bruni O, Vandi S, Montagna P, Ferini-Strambi L, Zucconi M. Ferri R, et al. J Sleep Res. 2008 Mar;17(1):89-100. doi: 10.1111/j.1365-2869.2008.00631.x. J Sleep Res. 2008. PMID: 18275559 Free article.
The average amplitude of the rectified submentalis muscle EMG signal was used for the assessment of atonia and a Sleep Atonia Index was developed; moreover, also chin muscle activations were detected and their duration and interval analyzed. ...Idiopathic RBD …
The average amplitude of the rectified submentalis muscle EMG signal was used for the assessment of atonia and a Sleep Atonia
REM Sleep Behavior Disorder in Children With Type 1 Narcolepsy Treated With Sodium Oxybate.
Antelmi E, Filardi M, Pizza F, Vandi S, Moresco M, Franceschini C, Tinazzi M, Ferri R, Plazzi G. Antelmi E, et al. Neurology. 2021 Jan 12;96(2):e250-e254. doi: 10.1212/WNL.0000000000011157. Epub 2020 Nov 11. Neurology. 2021. PMID: 33177222 Free PMC article.
OBJECTIVE: To study the effect of stable treatment with sodium oxybate (SO) on nocturnal REM sleep behavior disorder (RBD) and REM sleep without atonia (RSWA) that severely affected children with type 1 narcolepsy (NT1). ...RSWA was automatically computed by means of the v …
OBJECTIVE: To study the effect of stable treatment with sodium oxybate (SO) on nocturnal REM sleep behavior disorder (RBD) and REM sleep wit …
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