Journal of ISSN: 2374-6947JDMDC

Diabetes, Metabolic Disorders & Control
Volume 3 Issue 7 - 2016
Impact of Diabetes and Defective Thyroid Ontogenesis on Audition
Luciene da Cruz Fernandes1,2* and Caio Leonidas Andrade3
1Department of Phoaudiology, University Federal of Bahia, Brazil
2Department of Lifescience, Bahia State University, Brazil
3Doctorate in Interactive Processes of Organs and Systems, , University Federal of Bahia, Brazil
Received: November 11, 2016| Published: November 25, 2016
*Corresponding author: Luciene C Fernandes, Department of Phonoaudiology, Av. Miguel Calmon, s/n, Salvador, Bahia, Brazil. Tel. 557-132-838-887; Email:
Citation: Fernandes LC, Andrade CL (2016) Impact of Diabetes and Defective Thyroid Ontogenesis on Audition. J Diabetes Metab Disord Control 3(7): 00087. DOI: 10.15406/jdmdc.2016.03.00087


Among all of the systemic diseases, metabolic pathologies have shown significantly damaging effects on the auditory system, due to the peculiarity of how their different mechanisms directly affect the morphogenesis and/or physiology of the auditory system. Among the diverse metabolic diseases, congenital hypothyroidism (CH) and diabetes mellitus type I (DM1) are those most frequently related to the lesions that affect the peripheral and central auditory pathways, because of their physiopathological characteristics, and the high prevalence in the child population, in a critical period for overall human development. CH is one of the most common endocrine disorders in newborn infants (NI), affecting approximately 1:3000 to 1:4000 NI worldwide [1]. The clinical manifestations are diverse and change according to the age group. In untreated CH, somatic growth and functional differentiation of the central nervous system (SNC) are deep affected [2]. The synthesis of various proteins and enzymes is subject to normal functioning of the thyroid gland, whose hormones are necessary for the formation of the middle and internal structures of the [3], and of the central pathways of the auditory system [4]. Therefore, in situations of hypothyroidism, especially the congenital form of the disease, it is possible for auditory damage of endocochlear, retrocochlear origin, and of the more central auditory portions to occur [4].

On the other hand, the prevalence of DM1 is more accentuated in early childhood; it is ranked the second most frequent chronic disease in this age group, and may affect adolescents and young adults. Its incidence is close to 0.5 new cases per every 100,00o inhabitants/per year [5]. After onset of the disease, important disturbances in the metabolism of carbohydrates, lipids and proteins develop, favoring the appearance of complications such as neuropathy and angiopathy, common in diabetes mellitus [6]. In the auditory system, angiopathy may directly or indirectly interfere in the blood supply of the cochlea. But when neuropathy affects important sensory structures, it may cause auditory disturbances at the level of the peripheral or central pathways [7]. Furthermore, damage may occur during treatment, such a conditions of chronic or intermittent hyperglycemia that are frequently related to the pathogenesis of the endothelial lesions in diabetes [8]. Therefore, both metabolic alterations have the potential to injure the auditory structures, causing negative impacts on the affected person’s life. Children with hearing impairment are unable to acquire oral language skills in the period or at an adequate speed, because the acquisition of oral language is an essentially auditory event. When hearing loss is detected early, even during the neonatal period, treatment may be performed, thus avoiding harmful damage to the child.

In view of the foregoing, auditory evaluation forms part of a battery of complementary exams when childhood metabolic diseases such as CH and DM are diagnosed. Thus, early intervention will favor the quality of life of these individuals.


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