Long-Term Outcomes of Acute Low-Tone Hearing Loss

BACKGROUND AND OBJECTIVES: Although acute low-tone hearing loss has been associated with cochlear hydrops or early stage Meniere's disease, its prognosis in the short-term has been reported to be better than sudden hearing loss. However, recurrence of hearing loss and possible progression to Meniere's disease remain important concerns in the clinical setting. This study aims to investigate the long-term audiological outcomes of acute low-tone hearing loss. SUBJECTS AND METHODS: A retrospective review of patients presenting with a first attack of acute low-tone hearing loss was performed. Of the 77 patients, 33 were followed up for more than 3 months. Progression, recovery of hearing loss and recurrence of hearing loss were examined. Also, correlation between long-term outcomes and associated clinical factors were analyzed. RESULTS: Twenty-five patients (75.7%) had complete hearing recovery, five patients (15.1%) had partial recovery, two patients (6.0%) had no recovery, and one patient (3.0%) had progression of hearing loss 1 month after initial treatment. Thirty-three patients were followed up for more than 3 months (mean 22 months, range 3-79 months). Recurrences of acute low-tone hearing loss were observed in five patients (15.2%). All of the recurrences occurred during the first 12 months of follow-up. Long-term prognosis correlated with the initial therapy results (R2=0.693). CONCLUSIONS: Recurrences of hearing loss were documented in five patients (15.2%), and all of these cases occurred within one year of the first attack. Audiological outcomes after initial therapy may predict the recurrence of acute low-tone hearing loss.

Clinical and Audiologic Characteristics of Acute Low-Tone Sensorineural Hearing Loss: Therapeutic Response and Prognosis

OBJECTIVES: This study was designed to observe the clinical and audiologic characteristics of patients diagnosed as low tone hearing loss (LHL) and to evaluate the treatment response and prognosis. SUBJECTS AND METHODS: A retrospective chart review of 61 patients who were diagnosed with LHL was performed. Result of various audiologic studies and therapeutic responses of medication have been evaluated. Data were statistically analyzed with variables such as age, sex, interval between onset and treatment, initial hearing levels, findings of electrocochleargraphy, and initial concomitant symptoms according to their treatment response. RESULTS: Frequent chief complaints of LHL were tinnitus and earfullness. Tinnitus was usually matched at lower frequencies. Treatment with low-dose steroids, diuretics, and betahistine produced a high response rate of 79.4%. Complete response occurred in 49 of the 68 ears (72.1%) and partial response occurred in five of the 68 ears (7.4%). Fourteen of the 68 ears (20.6%) were in the non-responder group. Patients treated within 7 days after the onset of symptoms all showed complete response. Statistically significant prognostic factors affecting treatment response were age and intervals between onset and treatment (p<0.05). CONCLUSION: Patients with acutely onset tinnitus or ear fullness should be carefully evaluated and promptly treated under the diagnosis of LHL.