ENT Flashcards
Otitis Externa
Definition (1)
Discharge, itch, pain and tragal tenderness due to acute inflammation of the skin of the meatus, usually caused by excess canal moisture
Otitis Externa
Aetiology (5)
Mostly excess canal moisture Trauma eg. fingernails, itching especially in eczema and psoriasis Absence of wax (from self-cleaning) Narrow ear canal Hearing aids Pseudomonas and Staph. aureus
Otitis Externa
Mild (3)
Scaly skin with some erythema
Normal diameter of external auditory canal
Treatment: clearing with irrigation/syringing, hydrocortisone cream, antibacterial spray
Otitis Externa
Moderate (4)
Painful ear
Narrowed external auditory canal
Malodorous creamy discharge
Prescribe topical antibiotic +/- steroid drops
Otitis Externa
Severe (2)
External auditory canal is occluded
Treatment: thin ear wick inserted with aluminium acetate allowing canal to open up enough for microsuction/cleaning
Acute Otitis Media
Aetiology (3)
Commonly follows a viral URTI
Pneumococcus
Haemophilus
Acute Otitis Media Risk factors (4)
URTI
Passive smoking
Asthma
GORD
Acute Otitis Media
Signs + symptoms (5)
Rapid onset of pain due to bulging of the tympanic membrane, which eases if the drum perforates Fever Irritability Vomiting Purulent discharge
Acute Otitis Media
Treatment (4)
Analgesia
Many resolve spontaneously
Antibiotics if systemically unwell or no improvement over 4 days, amoxicillin
Clean external auditory canal
Acute Otitis Media
Complications (4)
Mastoiditis
Labyrinthitis
Facial palsy
Meningitis
Chronic Otitis Media
Definition (1)
Ear with a tympanic membrane perforation in the setting of recurrent/chronic infections
Chronic Otitis Media
Signs + symptoms (4)
Hearing loss
Otorrhoea
Fullness
Otalgia (painful ear)
Chronic Otitis Media
Classification (3)
Benign chronic otitis media: dry tympanic membrane perforation without active infection
Chronic serous otitis media: continuous serous drainage (straw coloured)
Chronic suppurative otitis media: persistent purulent drainage through a perforated tympanic membrane
Chronic Otitis Media
Treatment (3)
Topical/systemic antibiotics
Aural cleaning
Surgery: myringoplasty (repair of the tympanic membrane alone) or mastoidectomy
Chronic Otitis Media
Complications (1)
Cholesteatoma
Cholesteatoma
Definition (1)
A cyst/sac of keratinising squamous epithelium that most often occurs in the attic part of the middle ear
Cholesteatoma
Pathology (5)
Negative pressure in middle ear causes pars flaccida to balloon backwards, forming pocket
Epithelium falls into pocket
Ball of debris enlarges and is infected with Pseudomonas
Grows upwards into attic and backwards into mastoid
Cholesteatoma erodes bone: ossicles- conductive deafness, facial nerve- palsy, labyrinth- vertigo, roof of middle ear- intracranial sepsis
Cholesteatoma
Signs + symptoms (5)
Foul-smelling discharge
Conductive hearing loss
Attic retraction filled with squamous debris
Discharging attic perforation
Complications: facial palsy, vertigo, intracranial sepsis
Cholesteatoma
Treatment (2)
Surgical removal
More advanced disease that extends into the mastoid may require mastoidectomy
Otitis Media with Effusion (Glue Ear)
Aetiology (3)
Dysfunction of Eustachian tubes
URTIs
Oversized adenoids
Otitis Media with Effusion (Glue Ear)
Signs + symptoms (5)
Chief cause of hearing loss in young children (conductive)
May cause no pain
Variable appearance of tympanic membrane, eg. retracted/bulging drum
May have bubbles or a fluid level
Flat tympanogram (distinguishes from otosclerosis)
Otitis Media with Effusion (Glue Ear)
Treatment (3)
Usually resolves spontaneously
Surgery: if persistent and bilateral, insert ventilation tubes (grommets or tympanostomy tube)
Hearing aids
Mastoiditis
Definition (1)
Middle ear inflammation leads to destruction of air cells in the mastoid bone +/- abscess formation
Mastoiditis
Signs + symptoms (3)
Erosion of the bone can lead to swelling behind ear and thickening of the postauricular tissues, leading to the pinna becoming pushed out
Fever
Tenderness, swelling and redness behind pinna (mastoid)
Mastoiditis
Investigations (1)
CT
Mastoiditis
Treatment (2)
IV antibiotics
Myringotomy (incision into eardrum to relieve pressure or drain fluid) +/- mastoidectomy
Conductive Hearing Loss
Definition (1)
Impaired sound transmission via the external canal and middle ear ossicles to the foot of the stapes
Conductive Hearing Loss Hearing tests (3)
Pure tone audiometry: air-bone gap
Rinne’s test: negative (bone conduction > hearing loss)
Weber’s test: sound localises to the affected ear
Conductive Hearing Loss
Aetiology (4)
External canal obstruction (wax, debris, foreign body)
Drum perforation (trauma, infection)
Problems with the ossicular chain (otosclerosis, infection, trauma)
Inadequate Eustachian tube ventilation of the middle ear (eg. with effusion)
Conductive Hearing Loss
Sudden hearing loss (4)
Infection
Occlusion
Trauma
Fracture
Sensorineural Hearing Loss
Definition (1)
Defects central to the oval window in the cochlea or cochlear nerve leading to hearing loss
Sensorineural Hearing Loss Hearing tests (2)
Rinne’s: positive, AC>BC
Weber’s: localises to unaffected ear
Sensorineural Hearing Loss
Aetiology (7)
Ototoxic drugs (eg. streptomycin, vancomycin, gentamicin)
Post-infective (meningitis, measles, mumps, syphilis)
Meniere’s disease
Trauma
Presbyacusis
Acoustic neuroma (consider if unilateral)
Cholesteatoma (consider if unilateral)
Sensorineural Hearing Loss
Sudden Hearing Loss (6)
Noise exposure Gentamicin toxicity Mumps Acoustic neuroma MS May require steroids as treatment
Otosclerosis
Pathology (1)
New bone is formed around the stapes footplate, leading to its fixation and consequent conductive hearing loss
Otosclerosis
Signs + symptoms (4)
Usually appear in early adult life and can be accelerated in pregnancy
Conductive deafness: hearing often better with background noise
Tinnitus
Mild vertigo
Otosclerosis
Investigations (1)
Audiometry with masked bone conduction shows a dip at 2kHz (Cahart’s notch)
Otosclerosis
Treatment (3)
Hearing aid
Surgery: stapedectomy or stapedotomy to replace the adherent stapes
Cochlear implant if severe
Presbyacusis
Definition (1)
Age-related, bilateral, high-frequency sensorineural hearing loss
Presbyacusis
Signs + symptoms (2)
Gradual deafness (unnoticed until hearing of speech is affected with loss of high frequency sounds) Hearing most affected when there is background noise
Presbyacusis
Treatment (1)
Hearing aids
Childhood Deafness
Epidemiology (2)
1 in 500 newborns
50% genetic, 25% non-genetic, 25% idiopathic
Childhood Deafness
Genetic (2)
Conductive: congenital anomalies of pinna, external ear canal, drum or ossicles
Sensorineural: non-syndromic most common, Alport’s syndrome, Alport’s syndrome, Turner’s syndrome
Childhood Deafness
Non-genetic (4)
Intrauterine infection: CMV, HSV, syphilis
Perinatal: prematurity, hypoxia
Infections: meningitis, encephalitis, measles, mumps
Acoustic/cranial tumour
Childhood Deafness
Universal newborn hearing screening (3)
Within weeks of birth
Otoacoustic emissions: microphone placed in external meatus detects tiny cochlear sounds produced by movement of the outer hair cells
Audiological brainstem responses: earphones emit a series of soft clicks, electrodes on the infant’s forehead and neck measure brain wave activity in response to the clicks
Childhood Deafness Cochlear implants (1)
Directly stimulates auditory nerve when electrical signals are applied
Tinnitus
Definition (1)
Perception of sound typically in the absence of auditory stimulation
Tinnitus
Prevalence (1)
15%
Tinnitus
Signs + symptoms (4)
Unilateral or bilateral
Pulsatile or non-pulsatile
Ringing, hissing or buzzing suggests an inner ear or central cause
Popping or clicking suggests problems in the external or middle ear
Tinnitus
Classification (2)
Objective: audible to examiner, rare and due to vascular disorders (pulsatile vibratory sounds from AV malformation/carotid pathology) or high-output cardiac states (anaemia or hyperthyroidism)
Subjective: audible only to patient, most commonly associated with disorders causing SNHL (presbyacusis, Meniere’s, noise-induced), ototoxic drugs
Tinnitus
Investigations (3)
Audiometry
Tympanogram
Must do MRI if unilateral to rule out acoustic neuroma
Tinnitus
Treatment (5)
Treat any underlying cause Often improves over time Hearing aids Psychological support CBT
Noise-Induced Hearing Loss
Aetiology (3)
One-time exposure to intense sound eg. explosion
Most commonly occupational, continuous exposure to loud sounds that causes hearing loss overtime
Rupture of drum and ossicular fracture may occur
Noise-Induced Hearing Loss
Symptoms (2)
Bilateral symmetrical, sensorineural hearing loss +/- tinnitus
Audiometry typically shows a ‘notch’ at 3, 4 or 6kHz with recovery at 8kHz
Noise-Induced Hearing Loss
Treatment (4)
Reduce risk of occupational exposure
Provide ear defenders
Screen occupations at risk
In established hearing loss use hearing aids
Vertigo
Classification (2)
Vestibular (peripheral) vertigo: often severe and may be accompanied by loss of balance, nausea, vomiting, reduced hearing, tinnitus, nystagmus
Central vertigo: usually less severe, no hearing loss/tinnitus
Vertigo
Causes of peripheral vertigo (4)
Meniere’s disease
Benign paroxysmal positional vertigo
Vestibular failure
Labyrinthitis
Vertigo
Causes of central vertigo (4)
Acoustic neuroma
MS
Head injury
Migraine associated dizziness
Vertigo
Investigations (4)
Assess cranial nerves and ears
Test cerebellar function and reflexes
Romberg’s test (+ve if balance worse when eyes are shut)
Dix-Hallpike test
Benign Paroxysmal Positional Vertigo
Pathology (1)
Displacement of otoconia (otoliths) stimulate the semicircular canals
Benign Paroxysmal Positional Vertigo
Signs + symptoms (4)
Attacks of sudden rotational vertigo
Last >30 seconds
Provoked by head turning
+ve Dix-Hallpike
Benign Paroxysmal Positional Vertigo
Treatment (2)
Usually self-limiting
Epley manoeuvre