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H74.2 – Discontinuity of the Ossicles
H74.2 refers to discontinuity of the ossicles in the middle ear, causing conductive hearing loss with various possible underlying causes.
Things worth knowing about "H74.2"
H74.2 refers to discontinuity of the ossicles in the middle ear, causing conductive hearing loss with various possible underlying causes.
What is H74.2?
The ICD-10 code H74.2 refers to discontinuity of the ossicles, meaning an interruption or disruption of the ossicular chain in the middle ear. The three tiny bones – the malleus (hammer), incus (anvil), and stapes (stirrup) – are responsible for transmitting sound vibrations from the eardrum to the inner ear. When this chain is broken, sound transmission is significantly impaired.
Causes
Ossicular discontinuity can result from several conditions:
- Trauma: Head injuries, barotrauma, or direct ear trauma can dislocate or fracture the ossicles.
- Chronic otitis media: Long-standing middle ear infections can erode bone tissue over time.
- Cholesteatoma: This destructive epithelial growth can progressively destroy the ossicles.
- Iatrogenic causes: Complications following ear surgery.
- Congenital malformations: Rare structural abnormalities of the middle ear present from birth.
Symptoms
The hallmark symptom of H74.2 is conductive hearing loss, which may vary in severity depending on the degree of disruption:
- Significant reduction in hearing on the affected side
- A sensation of muffled or dampened hearing
- Tinnitus (ringing or noise in the ear) may accompany the hearing loss
- Typically painless in cases of purely mechanical disruption
Diagnosis
Several diagnostic tools are used to identify ossicular discontinuity:
- Pure-tone audiometry: Reveals a conductive hearing loss with a characteristic air-bone gap, often of 50–60 dB.
- Tympanometry: May show an abnormal high-compliance Type-Ad pattern.
- High-resolution CT (HRCT) of the temporal bone: Provides detailed imaging of the ossicles and pinpoints the location of the disruption.
- Otoscopy and microscopy: Assessment of the ear canal and eardrum by an ENT specialist.
Treatment
Treatment depends on the underlying cause and the extent of the damage:
Surgical Treatment
The primary treatment is tympanoplasty (middle ear reconstruction), aimed at restoring the ossicular chain. Techniques include:
- Ossiculoplasty: Reconstruction using autologous cartilage, bone, or prosthetic implants such as a PORP (partial ossicular replacement prosthesis) or TORP (total ossicular replacement prosthesis).
- Cholesteatoma removal: If cholesteatoma is the cause, it must be fully removed before reconstruction can be performed.
Non-Surgical and Hearing Aid Options
When surgery is not feasible or desired, hearing aids – particularly bone-anchored devices such as BAHA (Bone-Anchored Hearing Aid) – can provide a significant improvement in hearing function.
Prognosis
The prognosis depends on the underlying cause and the treatment approach. Successful surgical reconstruction can substantially improve or even normalize hearing in many patients. Early diagnosis and timely treatment are associated with better outcomes.
References
- Pschyrembel Clinical Dictionary, 268th edition, De Gruyter, 2020.
- Tos M. Manual of Middle Ear Surgery. Thieme, 1993–2009.
- World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Available at: https://www.who.int/classifications/icd/en/
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