Which of the following is not true about otosclerosis?
Ans: B (Eustachian tube is always abnormal) Ref: Diseases of the Ear, Nose, and Throat by PL Dhingra 5th edn.2010. P. 98 Explanation: Eustachian tube function is normal in otosclerosis. Otosclerosis Irregular spongy bone replaces the dense endochondral layer of the bony labyrinth. Hereditary. Associated with Van der hoove's syndrome- osteogenesis imperfecta, otosclerosis and blue sclera. More common in females. Hearing loss worsens during pregnancy. Cochlear type presents with SNHL. The stapedial type has CHL and may have anterior (most common) posterior, circumferential, biscuit or obliterative focus. C/F Hearing loss. Paracusis willisi and tinnitus (indicates an active focus). O/E Schwartze sign-- reddish hue over the promontory because of the increased vasculature in active lesions. PTA will show the type of hearing loss and Carhart's notch which is a dip in the bone conduction at 2kHz. Impedance audiometry will show an As type curve. Medical treatment with sodium fluoride can be tried. Surgery is the treatment of choice and includes stapedotomy or stapedectomy followed by replacement with a piston made of Teflon or stainless steel or titanium.
Hearing better in louder conditions
The eustachian tube is always abnormal
The tympanic membrane is normal
Bilateral progressive conductive deafness