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    Comparison of Functional Vestibulo-Ocular Reflex in Follicular and Luteal Phase in Young Girls
    (Aves, 2023) Cengiz, Deniz Ugur; Colak, Sanem Can; Koca, Hacer Unver
    BACKGROUND: The aim of this study is to compare the possible functional involvement of the vestibulo-ocular reflex in the follicular and luteal phases. METHODS: The research was carried out at a university located in eastern Turkey. The study included 37 healthy female volunteering students aged 18-25 years. The functional head impulse test was applied twice in the follicular phase and in the luteal phase, and the results in both phases were compared. RESULTS: In the functional head impulse test, statistically significant differences were obtained between the follicular phase and the luteal phase at the stimulus to the lateral semicircular canal direction total and 6000 degrees/s2 acceleration percentage of correct answers values, the posterior semicircular canal direction stimulations at 3000 degrees/s2 and 5000 degrees/s2 acceleration percentage of correct answers values, and the anterior semicircular canal direction stimulations at 5000 degrees/s2 acceleration percentage of correct answers values. CONCLUSION: In the luteal phase, which corresponds to the period before menstruation, the vestibulo-ocular reflex is functionally negatively affected.
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    Effects of Covid-19 on the audio-vestibular system
    (W B Saunders Co-Elsevier Inc, 2021) Tan, Mehmet; Cengiz, Deniz Ugur; Demir, Ismail; Demirel, Sumeyye; Colak, Sanem Can; Karakas, Oguz; Bayindir, Tuba
    Purpose: It was aimed to investigate the effects of COVID-19 infection on hearing and the vestibular system. Methods: Twenty-six patients whose treatment had been completed and who had no previous hearing or balance complaints were included in the study. Patients diagnosed with the disease by PCR were included in the study. Patients with at least one month of illness were included in the study. The hearing of patients was evaluated with transient evoked otoacoustic emissions (TEOAE) and pure-tone audiometry. Bedside tests, the European Evaluation of Vertigo scale (EEV), Video Head Impulse Test (vHIT), Ocular Vestibular Myogenic Evoked Potential (oVEMP), Cervical Vestibular Myogenic Evoked Potential (cVEMP) and Videonystagmography (VNG) tests were applied to evaluate the vestibular system. Results: A statistically significant difference was found between the COVID-19 positive and control groups according to the mean values of the 4000 Hz and 8000 Hz in both the right and left ears (p < 0.05). No statistically significant difference was found in the other frequencies and TEOAE. No statistically significant difference was found between the COVID-19 positive and control groups in terms of their normal or pathological VNG saccade, optokinetic and spontaneous nystagmus values (p > 0.05). The normal and pathological VNG head shake values were found to be significantly different between the COVID-19 positive and control groups (p < 0.05). Conclusion: The high frequencies in audiometry in the COVID-19 positive group were worse than those in the control group. In the vestibular system, especially in oVEMP and cVEMP, asymmetric findings were obtained in comparison to the control group, and a low gain in vHIT was shown. This study shows that the audiovestibular system of people with COVID-19 infection may be affected.
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    EFFECTS OF GAZE POSITION ON OCULAR VESTIBULAR EVOKED MYOGENIC POTENTIAL (oVEMP)
    (Dokuz Eylul Univ Inst Health Sciences, 2023) Cengiz, Deniz Ugur; Demir, Ismail; Colak, Sanem Can; Demirel, Sumeyye; Karababa, Ercan; Bayindir, Tuba
    Purpose:To compare ocular vestibular evoked myogenic potential (oVEMP) responses obtained with superomedial and oblique gaze positions. Material and Methods:The oVEMP test was applied in 59 healthy subjects at superomedial, right oblique, and left oblique gaze positions. Stimuli were presented at 110 dB nHL with a frequency of 500 Hz. oVEMP responses were recorded via electrodes placed on the lower eyelids. Results:Higher N1-P1 amplitudes were obtained in oblique gaze positions in the stimulated ear direction compared to the superomedial position (p < 0.05). The asymmetry values obtained in the superomedial gaze position were lower than those obtained in oblique gaze positions (p < 0.05). The asymmetry values obtained in the Superomedial and oblique gaze positions had no effect on the N1, P1, and N1-P1 latencies of the waves obtained from the Conclusion:Superomedial and oblique gaze positions affect oVEMP waves. In patients in whom vestibular hypofunction is suspected, it is recommended to control oVEMP responses in oblique gaze positions as well as in superomedial gaze positions in the evaluation of the residual vestibular functions.
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    Effects of valproic acid and levetiracetam monotherapy on balance functions in patients with generalized epilepsy
    (Academic Press Inc Elsevier Science, 2024) Cengiz, Deniz Ugur; Colak, Sanem Can; Ozdemir, Emre Akgun; Adiguzel, Ahmet
    Background: It is reported that antiepileptic drugs have an effect on balance functions. The aim of the study was to evaluate and compare the effects of valproic acid and levetiracetam monotherapy on balance functions in patients with generalized epilepsy using objective test methods. Methods: The study included 43 generalized epilepsy patients aged 18-60 years, including 20 patients receiving valproic acid monotherapy, 23 patients receiving levetiracetam monotherapy, and 25 healthy individuals as controls, in the Neurology Clinic of a university hospital in eastern Turkey. The demographic data form was filled out and the Video Head Impulse Test and Vestibular Evoked Myogenic Potentials test were performed. Results: Statistically significant differences were obtained between the groups in lateral, posterior, and anterior semicircular canal gains and RALP and LARP asymmetry values in the V-HIT test (p < 0.05). Statistically significant differences were obtained between the groups in P1, N1 latency and asymmetry values in the C-VEMP test and in N1, P1 latency, amplitude, and asymmetry values in the o-VEMP test (p < 0.05). Conclusion: Valproic acid and levetiracetam may affect the vestibulocular and vestibulocolic reflex pathways negatively. In this cohort, valproic acid had more pronounced adverse effects on balance functions as compared to levetiracetam.
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    Evaluation of vestibulo-ocular reflex with functional head impulse test in healthy individuals: normative values
    (Frontiers Media Sa, 2023) Cengiz, Deniz Ugur; Erbek, Hatice Seyra; Colak, Sanem Can; Kurtcu, Busra; Demirel Birisik, Sumeyye; Karababa, Ercan; Kusman, Busra
    Objectives: This study aimed to determine the normative values of the functional head impulse test (fHIT) test in healthy young adults.Materials and methods: The study included 100 individuals, 58 females and 42 males, aged 20-25 years. Beon Solution Zero Branco (TV) fHIT test was applied to all participants. FHIT results were analyzed in terms of lateral-posterior-anterior semicircular canals (SSCs), gender, and right-left ear.Results: In the fHIT test, for the lateral SSC the mean percent correct answer (%CA) values for 4,000-6,000 degrees/s(2) and 1,000-7,000 degrees/s(2) were 88.52 +/- 9.04 and 89.91 +/- 6.95, respectively; for the posterior SSC, the mean %CA values for SSC 3000-6,000 degrees/s(2) and 1,000-7,000 degrees/s(2) were 90.63 +/- 8.69 and 91.16 +/- 7.42, respectively; for the anterior SSC, the mean %CA values for 3,000-6,000 degrees/s(2) and 1,000-7,000 degrees/s(2) were 91.21 +/- 7.96 and 91.49 +/- 7.13, respectively. There was no statistically significant difference between the right and left ear in %CA values at all accelerations in all SSCs (p > 0.05). There was a statistically significant difference between genders in the mean %CA values for 6,000-7,000 degrees/s(2), 4,000-6,000 degrees/s(2), and 1,000-7,000 degrees/s(2) in the lateral SSC and 3,000-6,000 degrees/s(2) in the anterior SSC (p < 0.05).Conclusion: The FHIT is a noninvasive test battery that functionally evaluates the VOR of the six semicircular canals. In clinical use, the determination of normative values at all accelerations (1,000-7,000 degrees/s(2)) constitutes an important database for future studies to distinguish pathologic results.
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    Investigation of the Relationship Between BPPV with Anxiety, Sleep Quality and Falls
    (Galenos Publ House, 2022) Cengiz, Deniz Ugur; Demir, Ismail; Demirel, Suemeyye; Colak, Sanem Can; Emekci, Tugba; Bayindir, Tuba
    Objective: To investigate the effects of dizziness on sleep quality and psychological status in patients with benign paroxysmal positional vertigo (BPPV) and to evaluate its relationship with falls.Methods: A Demographic Data Form, a Visual Vertigo Analog Scale, the Falls Efficacy Scale -International (FES-I), the Hospital Anxiety and Depression Scale (HADS), and the Pittsburgh Sleep Quality Index (PSQI) were administered in 102 individuals diagnosed with BPPV by videonystagmography test. The same scales were applied to 75 healthy volunteers as the control group, and the two groups were compared. The BPPV group was divided into two groups as posterior canal and lateral canal BPPV. These two groups were compared among themselves and with the control group.Results: A statistically significant difference was found between the BPPV and control groups, the lateral canal BPPV and posterior canal BPPV groups, the lateral canal BPPV and control groups, and the posterior canal BPPV and control groups in terms of total scores of the PSQI, the FES-I, and the HADS (p<0.001). In the regression model, the FES-I score was fully explained by the PSQI and HADS scores (p<0.001).Conclusion: BPPV significantly affects sleep quality, psychological state, and the risk of fall. The negative effects of BPPV restrict daily living activities, affect the prognosis of the disease, and increase the risk of falling. Considering that psychiatric issues and sleep problems increase the risk of falling in individuals with BPPV, counseling services on this issue would reduce the incidence of falls and related injuries.
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    Vestibular Evaluation of Children Diagnosed with Specific Learning Disorder
    (Aves, 2023) Demir, Ismail; Cengiz, Deniz Ugur; Demir, Arzu caliskan; Colak, Sanem Can; Birisik, Suemeyye Demirel; Ozcan, Ozlem Ozel
    Objective:The aim of this study was to determine the vestibular function of children diag-nosed with specific learning disorders (SLD). Methods: This study was conducted with 30 children diagnosed with SLD and 30 healthy children matched for age and sex, and vestibular tests were applied. Results: Optokinetic and head shake test values in videonystagmography subtests were found to be pathological in the study group, and the lateral asymmetry value in video head impulse test (v-HIT) was found to be significantly higher in the study group. Also, a significant difference was found in the N1 latency, P1-N1 interlatency, P1-N1 amplitude values in the cervical vestibular evoked myogenic potential test, and asymmetry values in the ocular vestibular evoked myogenic potential test. Conclusion:The current study showed that vestibular functions may differ from normal in SLD patients and that vestibular dysfunction may play a role in symptoms such as postural instability, balance, and gross and fine motor disorders that are frequently observed in these children.