ENT_Hearing Loss

Question 1

Causes of hearing loss

Answer 1

Conductive

• External ear canal: wax, exoctosis, otitis externa
• middle ear: effusion-infection/haemotympnium, choleasteatoma, otosclerosis, TM peforation
• Age related hearing loss (Presbycusis)

Sensineural hearing loss

• Noise induced
• Congenital e.g. alport’s
• Medications e.g. gentamicin
• Schwannoma
• Viral e.g. CMV, HSV
• Autoimmune e.g. SLE, ulcerative colitis
• Perilymphatic fistula
• Neurological e.g. MS
• other e.g. diabetes, sarcoidosis

Question 2

Audiogram intepretation
1/ Meniere’s
2/ Ototoxicity
3/ Otosclerosis

Answer 2

1/ There is asymmetric unilateral hearing loss, upward sloping (worst in low frequencies).
2/ Ototoxicity, such as gentamicin or cisplatin / carboplatin. There is a symmetrical downsloping sensorineural loss
3/ Early otosclerosis gives a bilateral mild-moderate conductive loss, greater in lower frequencies.

(Ref: GP Trove)

Question 3

Audiology quiz
1/ See https://www.gptrove.net/audiogram-interpretation/
2/ Tuning Forks see study notes

Answer 3

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