**Question:** Female with stapedectomy done, has a conductive hearing loss at 60 dB. Diagnosis is

A. Otosclerosis
B. Mastoidectomy
C. Cochlear Neuritis
D. Meningitis

**Core Concept:**

A conductive hearing loss occurs when there is a problem with the transmission of sound waves from the eardrum to the inner ear. In this context, stapedectomy refers to an operation where the stapes bone in the middle ear is removed or replaced to relieve otosclerosis-related hearing loss. Otosclerosis is a condition that causes the bones in the middle ear to become rigid and thickened, leading to reduced transmission of sound waves and resulting in conductive hearing loss.

**Why the Correct Answer is Right:**

In this case, the patient has undergone a stapedectomy, which is a surgical procedure performed specifically to address otosclerosis. The surgery aims to relieve the conductive hearing loss caused by the rigid stapes bone in the middle ear. The hearing loss remains despite the surgery, indicating that the hearing loss is not due to the stapes bone but rather due to another condition.

**Why Each Wrong Option is Incorrect:**

A) Mastoidectomy is an ear surgery that involves removal of the mastoid bone, typically for chronic suppurative otitis media. In this context, it would not be the reason for a conductive hearing loss post-stapedectomy.

B) Cochlear neuritis is an inflammation of the cochlea, which is located in the inner ear and is responsible for converting sound vibrations into electrical signals. Cochlear neuritis is not the cause of the conductive hearing loss in a post-stapedectomy patient.

C) Meningitis is an inflammation of the meninges (protective membranes) surrounding the brain and spinal cord. This condition affects the entire nervous system and would not specifically explain a post-stapedectomy patient's conductive hearing loss.

D) Meningitis is a severe infection that affects the meninges (protective membranes) surrounding the brain and spinal cord. Meningitis does not specifically explain a post-stapedectomy patient's conductive hearing loss.

**Clinical Pearl:**

In post-stapedectomy patients with a residual conductive hearing loss, clinicians should consider other etiologies such as middle ear inflammation, middle ear fluid accumulation, or atticoantral fistula formation. These conditions can result in conductive hearing loss even after a stapes surgery, which is why the correct answer is not related to the surgical procedure itself (stapedectomy) but to an alternative cause of conductive hearing loss in this context.