The Effect of Obesity on Contralateral Suppression in Patients With Multiple Sclerosis

Ondokuz Mayıs University49 enrolled

Overview

This study investigates how obesity may affect the auditory system in individuals with Multiple Sclerosis (MS). Specifically, it examines the brain's ability to process and suppress sounds (contralateral suppression). The test is painless and brief. It provides information about the condition of the auditory nerve pathways. The goal is to better understand how obesity may influence this system and to improve follow-up and support for individuals with MS.

This study investigates the potential impact of obesity on auditory efferent system function in individuals diagnosed with Multiple Sclerosis (MS). Specifically, it focuses on assessing contralateral suppression of Distortion Product Otoacoustic Emissions (DPOAEs), a non-invasive, objective method for evaluating the integrity of the cochlear outer hair cells and the medial olivocochlear (MOC) efferent system. Participants will undergo a brief and painless auditory test, during which DPOAEs are recorded both in quiet and with contralateral acoustic stimulation. This approach allows for the assessment of the brainstem's ability to suppress cochlear responses, which reflects central auditory processing capabilities. By comparing suppression patterns across participants with different body mass index (BMI) classifications, the study aims to identify whether obesity contributes to functional changes in the auditory efferent system among MS patients. The outcomes of this research may enhance the understanding of how metabolic factors such as obesity interact with neurological conditions like MS, potentially guiding more personalized clinical monitoring and interventions.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

Conditions

Multiple Sclerosis Obesity Hearing Loss

Interventions

DPOAE with Contralateral SuppressionDIAGNOSTIC_TEST

Participants will undergo distortion evoked otoacoustic emissions (DPOAE) testing with contralateral broadband noise stimulation. The test is performed to evaluate auditory efferent system function, specifically the presence and degree of contralateral suppression. No medication or treatment is administered as part of the study. The procedure is non-invasive and commonly used in auditory diagnostics.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 50 Years

Medical Language ↔ Plain English

Eligibility Criteria Minimum Age: 18 Years Maximum Age: 50 Years Sex: All Gender Based: No Accepts Healthy Volunteers: No Inclusion Criteria: Ability to cooperate with the applied scales and auditory tests Normal findings in otoscopic examination (ear, nose, and throat evaluation) Absence of any neurological, psychiatric, or metabolic disease other than Multiple Sclerosis (MS) No history of significant noise exposure For female participants: not pregnant and not in the menstrual period Exclusion Criteria: Presence of active middle ear pathology (e.g., otitis media, tympanic membrane perforation) Abnormal tympanometric findings Hearing loss exceeding 20 dB HL at any frequency between 500-4000 Hz Neurological or psychiatric disorders other than MS History of ear surgery or otologic trauma Use of medications known to affect auditory function (e.g., ototoxic drugs) Inability to cooperate with audiological testing Pregnancy Diagnosis of metabolic or endocrine disorders (e.g., uncontrolled diabetes, thyroid dysfunction) Body Mass Index (BMI) below 18.5 (underweight) or above 40 (morbid obesity)

Locations (1)

Ondokuz Mayıs University

Samsun, Turkey (Türkiye)

Outcomes

Primary Outcomes

Contralateral supression

Comparison of contralateral suppression values of distortion product otoacoustic emissions (DPOAEs) between obese and non-obese patients with Multiple Sclerosis (MS) at multiple frequencies (1 kHz, 1.4 kHz, 2 kHz, 2.8 kHz, 4 kHz, 5.6 kHz, and 8 kHz).

Time frame: Within 12 months of MS diagnosis

Secondary Outcomes

DPOAE Amplitude Levels

Evaluation and comparison of baseline DPOAE amplitudes (without contralateral stimulation) between obese and non-obese MS patients at all test frequencies (1 kHz, 1.4 kHz, 2 kHz, 2.8 kHz, 4 kHz, 5.6 kHz, and 8 kHz).

Time frame: Within 12 months of MS diagnosis

Data from ClinicalTrials.gov

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