Establishment and validation of a clinical severity scoring system for succinic semialdehyde dehydrogenase deficiency

四分位数 生物标志物 医学 内科学 队列 癫痫 队列研究 自然史研究 精神科 自然史 置信区间 生物 生物化学
作者
Itay Tokatly Latzer,Jean Baptiste Roullet,K. Michael Gibson,Phillip L. Pearl
出处
期刊:Journal of Inherited Metabolic Disease [Wiley]
标识
DOI:10.1002/jimd.12635
摘要

Succinic semialdehyde dehydrogenase deficiency (SSADHD) is an inherited metabolic disorder with a variable phenotype and rate of progression. We aimed to develop and validate a clinical severity scoring (CSS) system applicable to the clinical setting and composed of five domains reflecting the principal manifestations of this disorder: cognitive, communication, motor, epilepsy, and psychiatry. A prospectively characterized cohort of 27 SSADHD subjects (55% females, median [IQR] age 9.2 [4.6-16.2] years) who enrolled in the SSADHD Natural History Study were included. The CSS was validated by comparison to an objective severity scoring (OSS) system based on comprehensive neuropsychologic and neurophysiologic assessments, which mirror and complement the domains of the CSS. The total CSS was sex and age-independent, and 80% of its domains lacked interdependence. With increasing age, there was a significant improvement in communication abilities (p = 0.05) and a worsening of epilepsy and psychiatric manifestations (p = 0.004 and p = 0.02, respectively). There was a significant correlation between all the CSS and OSS domain scores, as well as between the total CSS and OSS (R = 0.855, p < 0.001). Additionally, there were no significant demographic or clinical differences in the ratio of individuals in the upper quartile to the lower three quartiles of the CSS and OSS. The SSADHD CSS is validated using objective measures and offers a reliable condition-specific instrument universally applicable in clinical settings. This severity score may be utilized for family and patient counseling, genotype-phenotype correlations, biomarker development, clinical trials, and objective descriptions of the natural history of SSADHD.
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