ABSTRACT
Objective To investigate the impact of degree of hearing loss on auditory brainstem response predictions of behavioral thresholds. Methods A total of 179 patients with different hearing loss degree ( a total of 311 ears) patients from January 2012 to January 2016 in the affiliated hospital of Yan’an university were treated with auditory brainstem response (ABR), performed threshold behavior test, analyed the auditory brainstem electric response and behavioral threshold correlation, the factors that affect the ABR thresholds and behavioral threshold value and threshold of ABR and correction factor as well as linear regression equation for different frequency stimulation. Results ABR threshold was positively related to threshold behavior for the different frequencies stimulation, ABR threshold may predicte threshold behavior( P＜0.05) ; ABR threshold value can predicte behavioral threshold differ-ence error and the degree of hearing loss( P＜0.05) , through the relevant correction factors can reduce the predic-tion error. Conclusions Auditory brainstem responses may effectively predicte the hearing loss in children with be-havioural thresholds, differences in degree of hearing loss influence auditory brainstem response and behavioral threshold value, constant correction coefficient is conducive to auditory brainstem electric response and facilitates accuracy of the behavior threshold.
ABSTRACT
The hereditary spastic paraplegia (HSP), also known as Strumpell-Lorrain familial spasmodic paraplegia, is a highlighted clinical and genetic heterogeneity disorder with the prevalence of (2-9.6)/100,000. This disorder is characterized by progressive, usually severe spasticity and pyramidal weakness, predominantly in the lower limbs. Inheritance of this disease has been reported to be autosomal dominant (AD), autosomal recessive (AR), or X-linked recessive (XR), with the AD forms of HSP (ADHSP) being the most common type. At least 40 HSP gene loci have been localized and 19 genes have been identified. Forty percent of HSP cases are caused by mutations in the spastin (spastic paraplegia-4, SPG4) gene. Genetic diagnosis, the gold standard for diagnosis of the disease, may contribute to early diagnosis, presymptomatic diagnosis and prenatal diagnosis. The study of animal models plays an important role in revealing the molecular pathological mechanism of HSP. The known genetic research advances of the SPG4 gene are reviewed in this article.