Ani işitme kayıplı hastaların transkraniyal Doppler ultrasonografi ile değerlendirilmesi

Amaç: Vasküler patolojiyi belirleme açısından, ani işitmekayıplı olguların değerlendirilmesinde transkraniyal Doppler ultrasonografinin yeri araştırıldı.Hastalar ve Yöntemler: Ani işitme kaybı tanısı konmuş13 hasta çalışmaya alındı. Kronik otitis media, diğer ortakulak hastalıkları ve kulak ameliyatı öyküsü olan hastalarçalışma dışı bırakıldı. Bütün hastalara saf ses odyometri, impedans odyometrisi, transient evoked otoakustikemisyon, işitsel beyin sapı yanıtları ve transkraniyalDoppler ultrasonografi yapıldı. Kontrol grubu, kulak hastalığı, gürültülü yerde çalışma ve ototoksik ilaç kullanmaöyküsü olmayan, otoskopik ve odyometrik değerlendirmede patoloji saptanmayan, hasta grubuyla yaş ve cinsiyet bakımından farklılık bulunmayan sağlıklı 19 bireydenoluşturuldu.Bulgular: Ani işitme kayıplı olguların hasta tarafta vertebral arter ortalama akım hızı ve sistolik akım hızı ortalamaları sağlam tarafa göre istatistiksel olarak anlamlı derecede düşük, pulsatil indeks ortalaması ise yüksek bulundu.Çalışma grubunda, baziler arter ortalama akım hızı kontrolgrubuna göre düşük bulundu.Sonuç: Transkraniyal Doppler ultrasonografi ani işitmekayıplı olgularda vertebral ve baziler arter sistemindekivasküler etkilenmeyi değerlendirme amacıyla kullanılabilir

Assessment of patients with sudden hearing loss by transcranial Doppler ultrasonography

Objectives: We evaluated the utility of transcranial Doppler ultrasonography in determining the vascular pathology in patients with sudden hearing loss.Patients and Methods: The study included 13 patients 11 males, 2 females; mean age 46.6±17.7 years; range 18 to 66 years with a diagnosis of sudden hearing loss. Patients having chronic otitis media or other middle ear diseases or a history of surgery in the affected ear were excluded. Ali the patients were evaluated by pure-tone audiometry, imped- ance audiometry, transient evoked otoacoustic emissions, auditory brainstem responses, and transcranial Doppler ultrasonography. The results were compared with those of a control group of 19 age- and sex-matched healthy subjects 12 males, 7 females; mean age 46.8±6.9 years; range 33 to 58 years who did not have any ear disease or a history of ototoxic drug intake or vvorking in a noisy environment, and no pathology on otoscopic and audiometric examinations.Results: Compared to the normal ear, the mean blood flow and systolic flow velocities of the vertebral artery were sig- nificantly decreased, and the mean pulsatile index was sig- nificantly increased on the affected side. The mean flow velocity of the basilar artery in the patient group was lower than that found in the control group.Conclusion: Transcranial Doppler ultrasonography can be used for the evaluation of vascular involvement of the ver­ tebral and basilar arteries in patients with sudden sensorineural hearing loss.

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