clinical otology
DESCRIPTION
Clinical Otology. Balasubramanian Thiagarajan. Symtoms. Deafness Discharge Tinnitus Pain Vertigo. Deafness. Onset. Gradual. Sudden. Trigger. Sudden hearing loss (SN). Loss of atleast 30 dB in atleast three contiguous frequencies over a period of less than 3 days. Viral causes - PowerPoint PPT PresentationTRANSCRIPT
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Balasubramanian Thiagarajan
Clinical Otology
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Symtoms
• Deafness• Discharge• Tinnitus• Pain• Vertigo
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Deafness
Onset
Sudden GradualTrigger
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Sudden hearing loss (SN)
• Loss of atleast 30 dB in atleast three contiguous frequencies over a period of less than 3 days.
• Viral causes• Vascular causes• Hearing loss is the only symptom• High dose prednisolone may be useful
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Sensorineural hearing loss (Sudden)
• Transverse fracture of pertrous bone• Auto immune reaction following trauma / infection• Inflammatory reaction (Viral infections)• Vascular compromise
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Conductive hearing loss - (Sudden)
• Ossicular disruption• Haemotympanum (transient)• Failed attempts to remove cerumen
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Mixed hearing loss - (Sudden)
• Fractures involving petrous bone• Auto immune reaction to proteins released due to
traumatic injury
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Gradual progressive hearing loss
• Inflammatory• Degenerative
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Fluctuating hearing loss
• Impacted cerumen• Meniere's disease• Perilymph fistula
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Differentiating Conductive / SN loss
• Difficulty in comprehending spoken words• Deafness associated with tinnitus• Intolerance to loud sounds• Tuning fork tests
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Discharge
• Quantity• Quality• Duration of discharge• Aggravating / releiving factors
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Ear discharge - quality
• Mucoid - CSOM• Mucopurulent - CSOM with mastoiditis• Serous - ASOM• Serosanguinous - ASOM, Otitis externa, trauma• Watery - CSF otorrhoea
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Ear discharge - causes
• ASOM• CSOM• Otomycosis• CSF otorrhoea
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Tinnitus
• Wax• Active otosclerosis• Sensorineural hearing loss• Ototoxic drugs• Objective tinnitus - Patulous ET, Palatal myoclonus
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Pain
• Otalgia• Referred otalgia
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Ear pain
Otalgia
Referred otalgia
5,6,10th cranial nervesC2 & C3
Otomcosis
Tragaltenderness +
Myringitis granulosa
Tragal tenderness -
Keratosis obturans
Tragal tenderness +
AOM
Tragal tenderness -
Furuncle
Tragal tenderness +
impated waxTragaltenderness +
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Vertigo
• Sensation of unsteadiness / rotation• Diseases if inner ear cause vertigo• Associated with tinnitus and hard of hearing• Peripheral vertigo
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Nystagmus
• Spontaneous / evoked• Direction of nystagmus -
Right beating, left beating, geotrophic, ageotrophic.
• Plane - Horizontal, rotatory or vertical
• Intensity - (I, II and III degree)
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Spontaneous nystagmus
• Eye movements without congnitive, visual, vestibular stimulus
• Commonly induced by vestibular imbalance• Vestibular nystagmus is typically inhibited by visual
fixation• It follows Alexander's law (nystagmus is greater in
the direction of fast phases)
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Alexander's nystagmus grading
• I degree - Present only during gaze in the direction of fast phase
• II degree - Present during straight gaze and also increases in the direction of fast phase
• III degree - Present during all fields of gaze, but greatest in the direction of fast phase
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History should include
• Previous ear surgery• Previous head injury• Systemic diseases like diabetes / Hypertension• Use of ototoxic drugs• Noise exposure• Family h/o deafness• H/o atopy / allergy
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Inspection of external ear
• Shape and size of pinna• Presence of tags, preauricular sinus and pits• Evidence of trauma to pinna• Skin condition over pinna and external canal• Presence of operative scar in post aural area and end
aural region• Neoplastic lesions of pinna• Discharge from external canal
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Drug history / Occupation
• Drugs like gentamycin, Streptomycin, and Aspirin can cause extensive damage to hair cells of cochlea
• Noise exposure can cause damage to outer hair cells of cochlea
• May be reversible during early phases
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Drug induced ototoxicity - Features
• Bilateral sensorineural hearing loss• Bilaterally symmetrical hearing loss• Onset time - ???• Can occur even after a single large dose• Vestibular injury - common (aminoglycosides)• Positional nystagmus - a feature of vestibular injury
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Aminoglycosides
• Cleared more slowly from inner ear fluids than serum• There exists a latency - deafness may occur even 2
months after cessation of the treatment• Pts on potentially ototoxic aminoglycoside
medications should be monitored atleast for a period of 6 months following cessation of the offending drug.
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Discharge
• Duration• Quantity• Quality• Aggravating & releiving factors
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Acute ear discharge - Causes
• ASOM - Blood tinged• Otomycosis - Itchy ear, fungal mass seen• CSF otorrhoea
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Profuse ear discharge - Causes
• Chronic mastoiditis - Mastoid tenderness + May lead to formation of subperiosteal abscess
• Mastoid reservoir - Mastoid tenderness on deep palpation +
• Extradural abscess
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Quality of ear discharge
• Mucoid - CSOM• Mucopurulent - CSOM with mastoiditis• Serous - asom• Serosanguinous - ASOM, Otitis externa• Watery - CSF
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Tinnitus
• Subjective - perceived by the patient• Objective - perceived by both the pt and examiner
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Otalgia
• Pain in the ear• Could be due to inflammatory pathology affecting
the ear• Referred otalgia due to pathology elsewhere
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Three finger test
• Index, middle and thumb are used.• Index finger is applied over mastoid process -
tenderness indicates mastoiditis• Middle finger is applied over well of the concha -
tenderness indicates inflammation in the mastoid antrum area
• Thumb is used to apply pressure over mastoid process. Tenderness indicates mastoid emissary vein thrombophlebitis
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Peripheral vertigo
• Is defined as sensation of unsteadiness / rotation• Commonly caused by inner ear disorders• Associated with tinnitus / ear block
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Peripheral vertigo - Features
• It is fatigable• It is positional• Horizontal nystagmus• Cerebellar signs absent
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External ear
• Shape / size of pinna• Tags / sinuses / pits• Evidence of trauma to pinna• Perichonditis• Seroma• Skin of pinna / external canal• Discharge from external canal• Evidence of previous surgery• Neoplasm
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External canal - Straightening
• Aural speculum• Adults - Pinna is pulled
postero superiorly• Infants - pinna is pulled
posteriorly and downwards
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Ear drum
• Oval / pearly white in color• Pars tensa• Attic• Cone of light• Handle / lateral process of malleus• Perforations
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Cone of light
• Present in the antero inferior quadrant
• Cone shaped• Caused due to orientation
of middle fibrous layer• Broken up in retracted ear
drums• Broken up / lost when ear
drum bulges
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Color of ear drum
• Pearly white - normal• Red drum - Glomus jugulare, AOM• Blue drum - SOM, Hemotympanum• Pink drum - Flamingo sign• Chalky drum - Tympanosclerosis
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Retraction pocket features
• Prominent anterior and posterior malleolar folds
• Apparent foreshortening of handle of malleus
• Prominent lateral process of incus
• Decreased / absent mobility of ear drum
• Presence of pockets of retraction
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Siegel's speculum
• Convex lens• Magnifies 2.5 times• Mobility of ear drum• To suck out secretions from
middle ear• To apply ear drops by
displacement method
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Tuning fork tests
• Three frequencies are used• 256Hz, 512 Hz, 1024 Hz• These frequencies fall within speech range• Rinne, Weber and ABC
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Prerequisites of a good tuning fork
• It should be made of good alloy• Should vibrate for one full minute• Should not produce overtones
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Rinne test
• All three frequencies can be used
• + Rinne (Air conduction better than bone conduction)
• -ve Rinne (Bone conduction better than air conduction)
• False positive Rinne (occurs in unilateral total hearing loss due to opposite ear hearing)
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Weber test
• 512 Hz fork is used• Lateralized to worse ear• Useful in indentifying
conductive deafness• Can identify even 5 dB
hearing difference between two ears
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ABC test
• Helps in identifying s/n loss• Pts hearing is compared to that of the examiner• It is not reduced in normal ears
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Fistula test
• Performed by applying +ve - ve pressure to ear drum using penumatic speculum.
• Nystagmus can be visualized by the examiner or recorded using ENG machine
• Positive in the presence of fistula / vestibular fibrosis• Nystagmus occuring with tragal compression of
valsalva maneuver is caused by superior semicircular canal dehiscence syndrome
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+ve fistula test causes
• Oval / round window fistulae• Post stapedectomy perilymph leak• Horizontal canal fistula• Meniere's disease• Labyrinthitis
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Hennebert's sign
• +v e fistula test in the presence of intact ear drum• No evidence of middle ear disease• Seen in syphilis and hyper mobile foot plate status• Meniere's disease
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Tullio phenomenon
• Sound induced vestibular symptoms - vertigo, nystagmus, Oscillopsia and postural imbalance
• Seen in - Superior canal dehiscence, Meniere's disease, vestibulo fibrosis, perilymph fistula, post fenestration surgeries (i.e. stapedectomy)
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Head shake test
• pts head is positioned with chin inclined down 30 degrees
• Head is rotated rapidly to one side.• Normal response includes no nystagmus / few beats
of nystagmus• In unilateral labyrinthine dysfunction - nystagmus is
present with slow phase directed towards the direction of dysfunctional labyrinth
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Thank You
Otolaryngology onlinePublished by drtbalu