Idiopathic sudden sensorineural hearing loss in children

https://doi.org/10.1016/j.ijporl.2005.01.015Get rights and content

Summary

Objective:

Although idiopathic sudden sensorineural hearing loss (ISSHL) is a frequent disease in adults, less is known about incidence and treatment of ISSHL in children.

Method:

A retrospective chart analysis was performed to evaluate the frequency of ISSHL in children aged under 18 years between 2000 and 2003, who were treated in our department. Children received prednisolone intravenously at an initial dose of 3 mg/kg bodyweight. Prednisolone dose was reduced to half every second day. The medication was given for a maximum of 14 days or finished 2 days after the hearing normalized in pure-tone audiometry. The follow-up was continued between 3 and 14 months.

Results:

The complete recovery rate was 57%, and the partial recovery was 36%. Initial hearing loss of 50 dB and more was predictive for poor outcome in children (p = 0.028). Presence of tinnitus was without relevance for the outcome. The incidence of ISSHL in the local area of about 250,000 inhabitants was 1/10,000 in children.

Conclusion:

ISSHL seems to be a less frequent disease in children than in adults. Severe initial hearing loss is coupled with poor outcome. Under treatment with prednisolone hearing improvement was found in 13 of 14 patients.

Introduction

Idiopathic sudden sensorineural hearing loss (ISSHL) is a frequent disease in adults and is estimated to occur with an incidence of 20/100,000 in Germany [1]. It is characterized by sudden hearing impairment up to deafness within a short period of time and is possibly associated with vestibular dysfunction, tinnitus and pressure sensation in the affected ear. In a majority of cases, ISSHL is unilateral. The underlying mechanism remains unclear. Several causes of ISSHL have been discussed in literature including disturbed perfusion of the cochlear artery [2], viral infection [3] and autoimmunologic response [4], [5]. Furthermore, a large variety of treatment options have been tried out. Drug therapy of ISSHL includes oral or intravenous application of vasodilatators, plasma expanders, antiviral therapy and corticosteroids as single medication or in combination. HELP–apharesis, carbogen inhalation and hyperbaric oxygen therapy have been evaluated. Prospective, placebo-controlled, double-blind clinical trials have been performed on treatment with hydroxyethyl starch + pentoxifyllin and hydroxyethyl starch + pentoxifyllin + naftidrofuryl [6] hydroxyethyl starch + lidocaine [7], oral prednisone [8] and carbogen inhalation [9], hydroxyethyl starch and pentoxyfyllin [10]. Except for one study, which showed a positive treatment effect with steroid therapy [8], all of the above-mentioned clinical trials were unable to detect any positive effect in comparison to placebo treatment. The spontaneous complete hearing recovery is reported to range from 31% [11] to 68% [12] in all cases of ISSHL. Although several studies are focused on epidemiology and etiology of hearing-impaired children, less is known about the incidence and effective treatment of ISSHL in children. The positive effect of treatment with a combination of prednisolone, pentoxifyllin and hydroxyethyl starch for progressive hearing loss in hearing-impaired children has been reported [13]. In comparison to untreated children, a higher recovery rate is observed. Initial severe hearing loss associated with vertigo and a downward audiometry curve are coupled with poor prognosis for hearing recovery in a small group of children under the age of 15 years [14].

The aim of this study was to observe the incidence of ISSHL in children and the outcome in hearing improvement under prednisolone treatment.

Section snippets

Patients and methods

We performed a retrospective chart analysis of patients under 18 years of age from January 2000 to December 2003, who presented to our department with unilateral sudden hearing loss. The interval between the sudden onset of complaints and the initiation of treatment was limited to 2 weeks. The level of sudden hearing loss was measured by pure-tone audiometry at frequencies between 0.125 and 8 kHz and had to be at least more than 20 dB in three consecutive frequencies in comparison to the

Results

Fourteen patients under 18 years of age with ISSHL were included in the study. The mean age of these patients was 15 years (9–18 years). The interval between onset of complaints and treatment ranged between 1 and 14 days (mean, 3.2 days). Hearing loss was pantonal in 10 (71%) patients and the thresholds ranged from 30 to 100 dB. In two cases, hearing loss was located in low frequencies between 0.125 and 1 kHz with thresholds between 25 and 30 dB and in the two remaining cases hearing loss was

Discussion

As it has been stated before, little is known about treatment of ISSHL in children, while the treatment of ISSHL in adults is discussed controversially. In one study on medical treatment for progressive hearing loss in hearing-impaired children [13], a total recovery in 57% and a partial recovery in 28% of patients was achieved by prednisolone in combination with HAES 6% and pentoxifyllin. In an untreated group of 13 children, 3 (23%) had a spontaneous recovery. From another study a rate of

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