Abstract
Spinocerebellar ataxia type 2 (SCA2), caused by a CAG expansion (CAGexp) at ATXN2, has a complex clinical picture. While validated ataxia scales are available, comprehensive instruments to measure all SCA2 neurological manifestations are required. This study aims to validate the Neurological Examination Score for the assessment of Spinocerebellar Ataxias (NESSCA) to be used in SCA2 and to compare its responsiveness to those obtained with other instruments. NESSCA, SARA, SCAFI, and CCFS scales were applied in symptomatic SCA2 patients. Correlations were done with age at onset, disease duration, CAGexp, and between scales. Responsiveness was estimated by comparing deltas of stable to worse patients after 12 months, according to Patient Global Impression of change, and the area under the curve (AUC) of the Receiver Operating Characteristics curve of scores range. Eighty-eight evaluations (49 patients) were obtained. NESSCA had an even distribution and correlated with disease duration (r = 0.55), SARA (r = 0.63), and CAGexp (rho = 0.32): both explained 44% of NESSCA variance. Deltas (95% CI) after 1 year in stable and worse patients were only significantly different for SARA. NESSCA, SARA, SCAFI, and CCFS AUC were 0.63, 0.81, 0.49, and 0.48, respectively. NESSCA is valid to be used in SCA2. However, the only instrument that presented good responsiveness to change in 1 year was SARA. We suggest that NESSCA can be used as a secondary outcome in future trials in SCA2 due to the burden of neurological disabilities related to disease progression.
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Acknowledgements
The authors would like to thank the families who agreed to participate in this study. This work was supported by the following Brazilian agencies: CNPq—Conselho Nacional de Desenvolvimento Científico e Tecnológico—by the Project 78057/2012-1, FIPE-HCPA—Fundo de Incentivo à Pesquisa do Hospital de Clínicas de Porto Alegre—by the Projects GPPG HCPA 12-0357 and 12-0396, and by INAGEMP—Instituto Nacional de Genética Médica Populacional. M.A. and L.D.L.C. were supported by FAPERGS. ERR, MA, ASPS, MLSP, and LBJ were supported by CNPq.
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Monte, T.L., Reckziegel, E.R., Augustin, M.C. et al. NESSCA Validation and Responsiveness of Several Rating Scales in Spinocerebellar Ataxia Type 2. Cerebellum 16, 852–858 (2017). https://doi.org/10.1007/s12311-017-0855-8
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DOI: https://doi.org/10.1007/s12311-017-0855-8