Metabolic disorders in vertigo, tinnitus, and hearing loss

Vertigo, tinnitus, and hearing loss are common complaints among populations of industrial countries, especially in persons older than 40 years. Numerous agents are known to incite vertigo, tinnitus, and hearing loss, among them hyperinsulinemia, diabetes mellitus, and hyperlipidemia. In this study, we proposed to assess the occurrence of hyperinsulinemia, diabetes mellitus, and hyperlipidemia in patients suffering from vertigo, tinnitus, or hearing loss of unknown origin. Results of various tests in 48 patients were compared to those in 31 control subjects. Assessments of body mass index, blood pressure, and laryngological, audiometric, and electronystagmographic parameters were performed in all study participants. An oral glucose tolerance test was used to evaluate insulin levels, and lipoprotein phenotyping served to determine cholesterol, triglyceride, and lipoprotein levels. Patients were found to be significantly more overweight (on the basis of body mass index) than were the control subjects. Hypertension was more common among patients than controls, but the difference was significant only between the men in the two groups. Disturbances of glucose metabolism were found in 27.1% of patients but in only 9.7% of controls. Diabetes mellitus was not present in any controls but was identified in four patients. Hyperinsulinemia was almost twice as common in patients as in controls. Only the occurrence of hyperlipoproteinemia seemed not to differ between patients and control subjects. We conclude that such disturbances of glucose metabolism as diabetes mellitus and hyperinsulinemia may be responsible for inner ear diseases, whereas the role of disturbances of lipid metabolism remains vague.     

Neuroplasticity and rehabilitation research for speech, language, and swallowing disorders

PURPOSE: This article introduces a collection of consensus statements regarding the application of neuroplasticity principles to rehabilitation of dysphagia, dysarthria, apraxia, and aphasia.     

Noninflammatory, non-neoplastic disorders of the salivary glands.

Noninflammatory, non-neoplastic diseases comprise a diverse group of disorders that can present in a variety of ways. In general, a careful history will sharply focus the diagnostic possibilities. Although the diagnosis usually will be certain following the physical examination, additional testing may be needed to facilitate treatment planning. Sialolithiasis, cystic lesions, radiation injury, treatment to the parotid glands, sialodenosis, and other disorders are discussed in this article.     

Antioxidant micronutrient impact on hearing disorders: concept, rationale, and evidence

Purpose

Although auditory disorders are complex conditions, device-related modalities dominate current treatment. However, dysfunction from the central cortex to the inner ear apparatus is increasingly thought to be related to biochemical pathway abnormalities and to free radical-induced oxidative damage and chronic inflammation. Therefore, considering appropriate biologic therapy as an adjunct to standard care against these damaging factors may provide rational expansion of treatment options for otolaryngologists and audiologists.

Methods

This review outlines the biologic concepts related to some auditory and vestibular conditions and details the current rationale for utilizing antioxidants for a spectrum of hearing disorders. The strategy is based on the authors' collective experience in antioxidant science and supported with published research, pilot animal data and preliminary clinical observations.

Results

A comprehensive micronutrient approach was developed to exploit these pathways, and demonstrated safety and efficacy against oxidative damage and inflammation and clinically relevant neuroprotection. Cooperative research with Department of Defense institutions used prospective, randomized designs to show (1) reduction in oxidative damage measured in plasma and urine over six months, (2) protection against oxidative damage during 12 weeks of intense military training, (3) protection against inflammation after total body blast exposure (rodents), (4) strong neuroprotection against chemically-induced Parkinson's disease (rodents), (5) nerve VIII function improvement after concussive head injury in military personnel, and (6) tinnitus improvement in majority of patients after 90-day evaluation.

Conclusion

This systematic review of biologic strategies against hearing disorders combined with new animal and human observations may provide a rational basis for expanding current practice paradigms.     

Communication,functional disorders and lifestyle changes after total laryngectomy

Functional changes after total laryngectomy, including voice quality, hyposmia and dysgeusia, nasal discharge, swallowing and smoking habits were studied by means of a structured interview with 63 laryngectomized patients. Eighty per cent of the patients reported that they were satisfied with the quality of their voice including speaking on the telephone. Significant correlations were found between the quality of the voice and fatigue, frequency of making telephone calls and anxiety about speaking (P < 0.01). Vocal rehabilitation was achieved in the majority of patients (78%) with the indwelling Provox? voice prosthesis. Forty-five per cent of the patients complained about annoying eructation. Hyposmia was reported by 52% of the patients, while 15% experienced dysgeusia. A significant correlation was found between hyposmia and dysgeusia (R= 0.43, P < 0.001). All patients with a taste problem also reported a poor sense of smell. Daily nasal discharge was reported by 38% of the patients. Due to difficulties in swallowing solid food, about one quarter of the patients changed their diet. All but one patient had been heavy smokers pre-operatively. Only 9% continued to smoke post-operatively. These results, along with the previously reported respiratory problems resulting from total laryngectomy, should be taken into account in counselling patients who are candidates for this surgical procedure.