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[A clinical study of dip type hearing loss in children]
1Department of Otorhinolaryngology, Iwate Medical University School of Medicine, Morioka.
Insights
Dip type sensorineural hearing loss, common in boys, often presents at 4 kHz. This pediatric hearing loss shares similarities with adult cases, suggesting a potential hereditary component.
Area of Science:
- Otorhinolaryngology
- Audiology
- Genetics
Context:
- A 24-year study (1970-1994) analyzed 60 pediatric cases of dip type sensorineural hearing loss.
- The study compared clinical findings in children and adults with this hearing loss pattern.
Purpose:
- To evaluate and characterize pediatric dip type sensorineural hearing loss.
- To compare pediatric findings with adult cases and investigate potential causes and contributing factors.
Summary:
- Dip type hearing loss was more prevalent in boys, with 75% of cases having an unknown origin and 25% attributed to acoustic trauma.
- A significant majority (91.4%) of the 81 affected ears exhibited a dip at 4 kHz.
- Clinical presentation in children mirrored adult cases, and a hereditary factor was suspected due to observed familial patterns, particularly in fathers.
Impact:
- Highlights the prevalence and characteristics of pediatric dip type hearing loss.
- Suggests a potential genetic predisposition, warranting further investigation into hereditary factors.
- Provides comparative data between pediatric and adult hearing loss, aiding in diagnosis and management strategies.
Abstract:
Between 1970 and 1994, 60 pediatric cases, with 81 ears found to have dip type sensory neural hearing loss based on the appearance of an audiogram, were reported to the Department of Otorhinolaryngology at Iwate Medical University. These findings were clinically evaluated and compared to adult findings. The following results were obtained; 1) The dip type hearing loss was commonly seen among boys. 2) Approximately 25% were due to acoustic trauma, while 75% were of unknown origin. 3) Out of the 81 ears, 74 (91.4%) had a 4 kHz dip. 4) An 8kHz drop indicated "abrupt type" hearing loss. 5) Many fathers of the children with dip type hearing loss were also found to have a hearing disorder. Among these fathers, many were found to have a dip type hearing loss similar to that of their children. 6) There were no differences in the clinical findings of dip type hearing loss between the adult and pediatric cases. Thus, the adult form is essentially equivalent to that in children. 7) Since dip type hearing losses were found mostly in the male group, it was assumed that a hereditary factor is involved.