HTHSCI 2F03 Lecture Notes - Lecture 27: Pure Tone Audiometry, Otoacoustic Emission, Ear Pain
26 Dec 2020
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Document Summary
Headphones deliver tones at different frequencies and strengths in a sound-proofed room. Pt. indicates when sound appears and disappears. Threshold at different frequencies are plotted to give an audiogram. Flat tympanogram: mid ear fluid or perforation. Auditory stimulus c measurement of elicited brain response by surface electrode. Used for neonatal screening (if otoacoustic emission testing negative) Life-threatening infection which can skull osteomyelitis. 90% of pts. are diabetic (or other immune compromise) Severe otalgia which is worse @ night. Painful haemorrhagic blisters on deep meatal skin and tm. Joint tenderness exacerbated by lateral movements of an open jaw. Middle-ear inflam destruction of mastoid air cells and abscess formation. Glue ear / ome: effusion after symptom regression. Chronic: effusion > 3mo if bilat or > 6mo if unilat. Chronic suppurative om: ear discharge c hearing loss and evidence of central drum perforation. Rapid onset ear pain, tugging @ ear. Locally destructive expansion of stratified squamous epithelium within the middle ear.
