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Subjects were 227 patients with acute sensorineural hearing loss of 17,146 patients seen at our ear, nose, and throat (E.N.T.) outpatient clinic from October 1994 through September 2000. Of these, 45 suffered from profound and moderate idiopathic sudden hearing loss diagnosed when the arithmetical mean of hearing thresholds at 0.25, 0.5, 1, 2, and 4 KHz was 40 dB or worse. Of the 30 patients whose medical treatment was started within 7 days of onset, 18 (60%) showed excellent or complete recovery of hearing, whereas none of the 15 whose treatment was started 8 days or late after onset showed satisfactory improvement. In general, the sooner treatment was started, the better hearing recovered. Idiopathic acute low-tone sensorineural hearing loss was found in 111 (49%) patients with a female preponderance at a M:F ratio of 1:2.3, but no gender difference was seen in other diseases. The most common symptom was a feeling of pressure or fullness in the affected ear. Only 16% of patients were aware of their hearing disturbance. Some 73 (66%) showed complete recovery. Meniere's disease was diagnosed in 13, in whom hearing improved in only 2 (15%). Probable Meniere's disease was diagnosed in 9 patients who had 1 definitive episode of vertigo with low-tone sensorineural hearing loss, and their prognosis was good. The prognosis in 7 patients with hearing loss due to acoustic trauma and 1 with psychogenic hearing loss was good, but normal hearing was not restored in 1 with mumps or 1 with acoustic neurinoma. A patient with diabetic nephropathy had low-tone hearing loss and nystagmus toward the affected ear. Attacks of vertigo were controlled by diuretic therapy, but hearing recovery occurred by a little less than 10 dB. Some 35 patients had mild idiopathic hearing loss and prognosis was relatively good. Hearing was disturbed after head injury in 2 and after nose blowing in 1, probably attributable to concussion of the labyrinth or the formation of a perilymphatic fistula. The diagnosis of this condition could not be made with certainty by surgical exploration of the ear.

Acute Sensorineural Hearing Loss in 227 Outpatient Cases.