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    REVIEW

    REVIEW ON ANATOMY

    External ear:

    y anything lateral to the tympanic membraneMiddle ear:

    y anything within the middle ear spaceincluding the Eustachian tube

    External ear:

    y cochlea, vestibuleThe mainstay for any diagnosis is a good physical

    examination, of course, and the mainstay of any

    general practitioner that wishes to examine the ear

    is an otoscope.

    USING THE OTOSCOPE

    1. Pull the ear upward and backward to

    straighten the ear canal.

    2. Inspect the whole auricle and the back of

    the ear (the post-auricular area). Choose the right

    size of speculum.

    3. Insert gently into the ear. Do not jab

    because the ear is very pain sensitive. Also, do not

    torque the handle while examining.

    4. Roll gently with fingertips touching the

    otoscope. Please be very very gentle.

    The otoscope may be held like a gun. . . (he was

    about to say more, but was distracted by the

    attendance.)

    THE TYMPANIC MEMBRANE (TM)

    *Note the structures:

    y cone of lighty handle of malleusy short process of the malleusy long process of the malleusy maleolar-incunal jointy malleusy incusy parstensa (major portion of tympanic

    membrane)

    y parsflaccida*Note the laterality

    PATHWAY OF HEARING

    MIDDLE EAR

    y converts sound energy into mechanicalenergy

    Tympanicmembrane

    y area is 15x that of the oval window andstapes

    y very sound-senstivey sound vibrates the tympanic membrane,

    which in turn vibrates the ossicles,

    eventually the footplate of the stapes.

    y energy is amplified due to the proportion ofthe size of the tympanic membrane to the

    stapes

    y however, one cannot have a good andfunctioning eardrum (tympanic membrane)

    without a normal functioning Eustachiantube

    Eustachian tube

    y maintains the health of the middle eary provides drainage: ear mucosa is

    respiratory. Without the Eustachian tube,

    mucous secretions will be a very good

    Subject: MedicineTopic: ENT- Hearing Loss, Vertigo and

    TinnitusLecturer: Dr. RamosDate of Lecture:Aug. 1, 2011Transcriptionist: pinkyredPages: 16

    SY

    2011-2012

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    culture media for microorganisms to grow

    into

    y aeratesy protects: closes when one blows hard,

    protecting the tympanic membrane

    y If one does not have a Eustachian tube andhe blows his nose, the tympanic membrane

    will fly off the ear.

    y regulates pressure: opens in high altitudesand during descent to equalize pressure

    y opened and closed by velo-pharyngealmuscles (tensor velipalatini,

    levatorvelipalatini, palatoglossus, palato-

    pharyngeus muscle, muscles of the soft

    palate)

    Soft palate

    y opens and closes the Eustachian tubey provides a means of sealing the

    nasopharynx and oropharynx

    y allowing one to drink without having thefluids go into ones nose

    y allows one to pronounce K and Qy cleft palate patients are prone to ear

    infections due to the abnormal functions in

    the Eustachian tube

    INNER EAR

    Cochlea

    Note structures:

    y organ of cortiy modiolus (midline)Bony center of the

    Cochlear Spiral

    y basilar membrane

    y tectorial platey Reissnersmembrane(where endolymph

    and perilymph are)

    y Rosenthals canal is where the modiolusbecomes the spiral ganglion,

    y spiral ganglionaggregates to form thecochlear nerve

    y Basilar membrane becomes progressivelythicker as it nears the apex

    The footplate of the stapes is attached to the oval

    window, which is in close relationship with the

    endolymph and perilymph (has higher sodium)

    Vibrating the oval window vibrates the fluids

    The shearing forces of the fluid vibration in the

    tectorial plate rub against the hair cells in the very

    sensitive basal membrane and transmit the signal to

    the nerve fibers in the spiral ganglion to becomethe cochlear nerve.

    Lower portion (base) is for high frequency sound;

    the apex is for low frequency sound.

    OrganofCorti

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    inner and outer hair cells

    y depolarize and send their signals to thecochlear nerve fibers

    y mechanical energy becomesneurotransmitters

    y very low electrical energy going to thenervey shearing the forces towards the kinocilium:

    excitatory

    y shearing the forces away from thekinocilium: inhibitory

    Pathwayofhearing

    remember COLIMA:

    y cochlea will transmit the impulses to thecochlear nerve

    y to the cochlear nucleusy superiorolivary nucleusy laterallemniscusy inferiorcolliculusy medialgeniculate bodyy auditory cortex

    HEARING LOSS, VERTIGO, DIZZINESS

    HEARING LOSSy conductive

    o problem with transferring sound tothe nerve

    y sensorineuralo damage to the nerve

    y mixedo damage to both tympanic

    membrane and nerve

    CONDUCTIVEHEARING LOSS

    y Impaired conduction of sound to the innerear.

    y Caused by disease of the external auditorycanal and middle ear.

    EXTERNAL EAR PATHOLOGY

    y External canal swelling/inflammation (e.g.furuncle/pimple, swimmers ear: acquiredby swimming in contaminated water)

    y Foreign body(various objects including nits,usually from pets)

    y Impacted cerumeny Tumory Bony exostosisy Congenital abnormalities (e.g. microtia)

    Otitisexterna

    Acute inflammatory change (pain, redness, swelling,

    3 weeks onset)

    Auricle

    y if only the cartilage is involved,perichondritis (common in physical

    altercations, contact sports)

    y if it also involves the earlobe and itssurroundings, cellulitis (e.g. people

    reviewing, eating chips, then falling asleep,

    and accidentally applying chip residue in the

    ears, then a cockroach enters the ear canal,

    burrowing deeper and deeper as the

    patient tries to draw it outif this happens,

    dont manipulate the roach, drown it in oil.)

    y if there are vesicles, herpes zosteroticusExternalearcanal

    y localized swelling in circumscribedotitisexterna(furuncle)

    y swelling in the entire ear canal in diffuseotitisexternaor swimmers ear

    y hemorrhagicotorrhea inbullousotitisexternaor luga

    y mucopurulentotorrhea in chronic otitismedia with tympanic membrane

    perforation

    Chronic inflammatory change (itching, scaling)

    Absent signs of otitis media

    y thickened and scaly skin in chroniceczemaoftheearcanal

    y ulcer in necrotizingotitisexternay granulations (appear like raw tocino) in

    fungal infections,

    granulomatousotitisexterna, tumors

    Present signs of otitis media

    y purulentotorrhea in otitisexternaaccompanying otitis mediawith tympanic

    membraneperforation

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    y mucosal polyp and crusts in bony ear canalin suspectedcholesteatoma

    Diffuseotitisexterna/eczema

    y Inflammation of the canal skin due tomechanical injury, toxicity or allergy.

    y Mixed bacterial infection of the skin thatinclude G(-) organisms(Pseudomonas

    aeruginosa, Proteus mirabilis) anaerobes

    and fungi

    y swimmers eary

    Pain, purulent discharge, canal obstruction(due to the ear canal being bony, it cannot

    swell out, it swells in) thus pain and hearing

    loss.

    y Diffuse swelling, fetid discharge (anaerobicinflammation), crusting

    y Cleansing, antibiotics, keep dry, analgesiay topical steroids in patients with very

    inflamed ear, but should be chosen

    carefullysteroids impair hearing and

    wound healing, and aggravates infection

    Foreignbody

    y common in children, insert play objects intothe ear canal.

    y Ear plugs, objects used in ear manipulation,adults.

    y Check for associated injuries.y DO NOT IRRIGATE!y topical anesthetics for the ear are not very

    effective

    *Do not clamp, roll it out gently with a pick under

    magnification. Dont jab at the skin, its very very

    painful

    Cerumen

    y ear waxy ear is self cleansing epithelial migration

    from TM to meatusy Ceruminous/sebaceous galnds

    o Protective film of fatty acids,lysozymes and is acidic.

    o Protectiony only the outer half of the ear canal

    produces wax (only the hair-bearing

    structures)

    y contain enzymes that kill germs and fungiy acidic to be fungicidal and fungistaticy waterproofs the eary natural protective mechanism of the eardo not remove everyday, clean ears once

    every two weeks (only the outer half, with

    circular motions)

    y soften the ear wax first before irrigationy irrigate when the wax is soft and lysed with

    drops

    y hard, dry impacted wax would only absorbthe water, expand and cause even more

    pain and the expansion could cause

    inflammation and swelling

    y soften with hydrogen peroxide, dilute drops(50%), baby oil, otosol or ducosate sodium

    Tumors oftheearcanal

    y EAC tumors are rare it commonlyassociated with auricular tumors(malignancy).

    y Frequently mistaken for otitisexterna.y Most common is skin cancery Painful, ulcerated, non healing lesion or the

    EAC, bleeding, 2ndary infection, otorrhea.

    y BIOPSY under microscopy

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    y Surgery, irradiation (unfavorable becauseradiation is not very good with bones).

    y cutaneous horns kulugoy basal cell carcinoma hyperpigmented

    broad-based lesion

    y squamous cell carcinoma non-healingulcer

    Exostoses and hyperostosesabnormal boneformations in the ear canal

    Exostoses

    y True osteomas commonly located near theannulus (superomedial canal wall).

    y Develop from ossification centersy Pale rounded bony prominences

    Hyperostoses

    y Appositional growth of the bony EACusually induced by periosteal irritation eg.

    Frequent contact with cold water

    Malformations oftheauricle

    Auricular dysplasia

    y GRADE I structural subunits of the auricleare present .But, malformed. (macrotia,

    prominent ears). Simple or even no

    correction necessary.

    y GRADE II- auricle is small, severelymisshapen and lacks sub units. Anomaly of

    the EAC often present. Meticulous

    corrective surgery.

    y GRADE III normal auricular structures areabsent and EAC is almost always atretic.

    Audiologic testing, bone conduction hearing

    aids, reconstruction.

    MIDDLE EAR PATHOLOGY

    y Infection: Otitis mediay Middle ear effusion

    y Tympanic membrane sclerosisy Traumatic TM perforations

    Otitis media

    Based largely on 2 functional disturbances

    y Impaired middle ear ventilationo Eustachian tube dysfunctiono mucosal swellingo negative middle ear pressureo obstructiono deficient openingo special anatomy in

    children/cleftpatients (children

    have short, flat Eustachian tubes, in

    contrast to adults, who have long

    and angled at 45r Eustachian tubes)

    y Middle ear inflammationo U.R.T.I. adenoiditiso allergy, acid reflux.o

    viral/bacterial middle ear infection

    The above is a very busy slide, but, he wants us toremember:

    y any Eustachian tube dysfunction thatcauses

    o impaired middle ear ventilationo negative middle ear pressureo edema and mucosal inflammation

    y arecausedbyo palatal deformityo muscular dysfunctiono ciliary dysfunction

    HISTORY

    y There are no specific complaints for middleear dis.

    y Otalgia, discharge, pressure or hearing lossare non specific.

    y Hx of chronic inflammatory ear diseaseusually signify otitis media.

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    y Can lead to scarring and poor middle earventilation (ET)

    y Ask for Hx of TM perforation, trauma orprevious surgery.

    EXAMINATION

    Otoscopy

    y mainstay of middle ear diseaseinvestigation

    Function tests: TM mobility

    y passive mobilityo pneumaticotoscopy

    y active mobilityo movement of the post. Superior

    quadrant in reaponse to introduced

    air pressure.

    o Valsalva, Toynbee. (do notuse in acute inflammation of the

    M.E. and N.P.)

    TUNING FORK TESTS

    y The goal of tuning fork tests is to diff. bet.Conductive and Sensorineural hearing loss.

    (hearing loss is not detected directly with

    tuning forks) using 512 - 800 Hz forks.

    Weber test

    y strike the tuning fork, and place on patientsforehead

    y NORMAL sound is perceived equally inboth ears.

    y S.N.H.L. sound lateralizes to the betterear.

    y C.H.L. sound lateralizes to the poorerear.

    Rinnes test

    y Compares air and bone conduction in thesame ear.

    y strike the tuning fork and place the base onthe patients mastoid.

    y when patient stops hearing the tune, placeit 1cm from patients ear with the forkfacing the examiner.

    y POSITIVE RINNE air conducted sound isperceived louder and longer duration.

    (normal)

    y NEGATIVE RINNE sound is perceivedlouder and of longer duration at the

    mastoid than at the ear canal. (conductive

    hearing loss)

    OTITISMEDIA

    Otitis mediawitheffusion

    y One of the most common disorder in preschool children.

    y Eustachian tube dysfunction leads tonegative pressure in the middle ear and

    effusion. (sniffing)

    y Major symptom is hearing loss.y Diagnosis: otoscopyy Decongestants, topical steroids, antibioticsy Persistence of 3wks. nasal endoscopy to r/o

    tumor (adults)

    y myringotomy

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    Acuteotitis media

    y Generally caused by ascending infection tothe middle ear via the eustachian tube.

    y Streptococci.,H. influenzae, B. catarrhalis,respiratory viruses.

    y Adenoids- nidus for infection.y Severe ear pain, fever, ear discharge,

    irritability (vomiting, diarrhea in infants)

    y Spontaneous TM perforation may occury NSAIDs, decongestants (

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    y T.M. has a strong capacity for self healing.Most heal by themselves. Keep ears dry.

    y Surgery for more complicated cases.

    SENSORINEURAL HEARING LOSS

    y Noise induced hearing lossy Labyrinthitisy Ototoxicityy Sudden SNHLy Presbycusisdue to aging

    Noiseinducedhearingloss

    y Excessive noise exposure can cause directmechanical trauma and metabolic injury to

    the cochlea.

    y The nature and extent of damage dependon the acoustic energy and duration of

    noise exposure.

    y if noise level is 140dBof short duration.

    y Blast injury presence of a ruptured TMy Acute noise induced hearing lossy Often reversible concert, impact noise,

    power tools, engine noise

    y Chronic noise induced hearing lossy Irreversible cochlear hearing loss. Severity

    depends on noise level, exposure time and

    individual factors.

    * tinnitus

    Diagnosis

    y NO KNOWN TREATMENTy Prevention is paramounty Primary reduce noise

    y 2ndary protection, transfer, screeningy 02, steroids, improve microcirculation and

    metabolic conditions in acute exposure

    Labyrynthitis

    y Infectious, inflammatory process affectingthe labyrinth and its surroundings.

    y Tympanogenic from the middle ear to theround or oval window.( toxic, suppurative,

    chronic)

    y Meningeal infection from intracranialsource (Strep.)

    y Hematogenous mumps, measles, HIV,CMV, syphilis

    y Cochlear hearing loss, tinnitus, vestibularsymptoms.

    y Rule out fistulay Myringotomy for decompresssion, culturey Mastoidectomyy High dose antibiotics that can cross the

    B.B.B.

    y Steroids try to avoid unless absolutelynecessary

    y Damage can affect cochlear and vestibularfunctions

    y Can be reversible or otherwisey Symmetricaly Hearing loss, tinnitus, disequilibrium

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    y Affect hair cells, striavascularis (providesnutrients to the organ of Corti)

    y can be reversible, if drug is stopped on timeSuddenSensorineuralHearing Loss

    y Immediate unilateral hearing loss ofsensorineural origin that has no apparent

    external cause.

    y Idiopathic believed to be of viral, vascularor auto immune cause. Symptoms occur in

    seconds to hours.

    y Hearing loss is variable in frequencies anddegree, from mild loss to sudden deafness.

    y Otoscopy is normaly Weber is to the better eary REFER TO AN ENT ASAPy Steroids, oxygenation NO PROVEN

    THERAPY IS EFFECTIVE

    y 50% spontaneously resolvey herpes zoster oticusy psychogenic (e.g. shell shock)

    y normal hearing should not go beyond 25 dBPresbycusis

    y Age related apparently idiopathic andsymmetrical S.N.H.L that affects persons 50

    y/o and above.

    y High frequencies more affected.y Speech recognition is impaired, tinnitus,

    hearing loss

    y Aging, genetics, cummulative exposure toexogenous sources.

    y Progressive and no specific medical norsurgical treatment. But, hearing aids.

    y men are more affected with presbycusis

    y A is normal: the bone conduction and airconduction have no gap, at the same

    intensity

    y B has conductive hearing loss: the bone andair conduction has a gap of more than 10

    intensity. Also, the air conduction is at ahigh intensity, while bone conduction is

    normal

    y C has sensorineural hearing loss: the boneconduction and air conduction have no gap,

    but as the frequency increases, both

    decrease in intensity

    y D has mixed hearing loss: the boneconduction and air conduction has a gap of

    more than 10 dB, and both decrease in

    intensity as the frequency increases

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    LABYRYNTHINE ANATOMY

    Note structures:

    y semicircular canalsy utricley

    sacculey ampullay endolymphatic sacy cochlea

    Innerearcirculation

    y The different parts of the inner ear aresupplied with blood through the internal

    auditory artery (that forms 3 branches in

    the inner ear) which originates from the

    basilararteryin the base of the skull.

    y three branches:o Cochlear artery supplies blood to

    most of the cochlea.

    o Vestibular artery supplies thesemicircular canals and part of the

    vestibule.

    o Cochleo-vestibular artery suppliesthe remainder of the inner ear.

    Utricle, sacculeand semicircularcanals

    Utricleand saccule

    y horizontal (forward/back) and vertical(up/down), respectively

    y linear acceleration (up and down, forwardand backward)

    Semicircularcanals

    y angular acceleration (tilting, rotation)

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    Motion sensing

    deflection and reflection of the haircells move the

    otholiths toward (stimulatory) and away (inhibitory)

    from the kinocilium, relaying information on which

    direction the body is moving.

    VESTIBULAR SYSTEM

    Fivecomponents (VERY IMPORTANT!)

    1. PERIPHERAL RECEPTOR APPARATUSresides in the inner ear and is responsible

    for transducing head motion and position

    into neural information.

    2. CENTRAL VESTIBULAR NUCLEI comprise

    a set of neurons in the brainstem that are

    responsible for receiving, integrating, and

    distributing information that controls motor

    activities such as eye and head movements,

    postural reflexes, and gravity-dependent

    autonomic reflexes and spatial orientation.

    3. VESTIBULO-O

    CULAR NETWO

    RK arisesfrom the vestibular nuclei and is involved in

    the control of eye movements.

    4. VESTIBULOSPINAL NETWORK

    coordinates head movements, axial

    musculature, and postural reflexes.

    5. VESTIBULO-THALAMO-CORTICAL

    NETWORK is responsible for the conscious

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    perception of movement and spatial

    orientation

    Vestibularfunction

    y Vestibulo-Ocular Reflexo Fixation of visual horizon for spatial

    orientation during rapid head

    movements. Allows a fixated object

    to stay within the visual fieldo Stimuli for the VOR mainly from SCC

    -This is how one fixates an object on the visual field

    in a lighted area. In a dark room, one cannot move

    his head because there is no visual reference.

    -When one walks in the dark, even if it is a clear

    room, the balance system is impaired and switches

    to a different mode.

    y Vestibulospinal Reflexo Maintenance of posture and

    equilibrium. Relies mainly on

    interaction with the proprioceptive

    and motor systems

    This illustrates the various connections of the

    vestibular nuclei

    y armsy trunky spinal cordy eary eyesy cerebellumy brain [sic]

    CLINICAL PRESENTATION OF VESTIBULAR

    DISORDERS

    y DIZZINESS may mean any non painfuldiscomfort related to the head. (cerebral,

    visual, vestibular etc.)

    y VERT

    IGO hallucination of movement ofthe patient or his environment.

    y UNSTEADINESS loss of equilibrium inrelation to ones environment.

    y LIGHTHEADEDNESS loss of equilibriumwithin ones head. (poorly described by

    patient)

    APPROACH TO A DIZZY PATIENT

    y Medical historyy Physical examinationy Basic laboratory examy Physiologic diagnostic toolsy Radiologic diagnostic tools

    Patient evaluation

    y historyo 1.ONSETo 2.DURATIONo 3.SEVERITY

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    o 4.AGGRAVATING FACTORSo 5.RELIEVING FACTORSo include:

    past illness family allergy medication dietary smoking, etc.

    y complete ear, nose throat and neurologicexam

    y include:o observation for nystagmus

    any rhythmical eyemovement either

    spontaneous, provoked or

    induced. May be

    physiologic or pathologic.

    Clinicalexamination

    y Spinal motor function and coordinationo Standard vestibular test battery:

    Rombergs test. Unterberger test. Finger to nose test.

    y Oculomotor testingo Ocular motilityo Smooth pursuito Screening for oscillopsia

    y Nystagmus testingo Any rhythmical eye movement

    either spontaneous, provoked or

    induced. May be physiologic or

    pathologic

    Physicalexam

    y Systemic (e.g. diabetes, hypertension)y Psychiatric (e.g. hysteria)y Otologic (e.g. discharge, tumor)y Ophthalmologic (e.g. blurring of vision,

    diability to fixate, glaucoma)

    y Neurologic (e.g. cerebrovascular problem,tumor)

    Nystagmus

    y fast componento determines directiono the reticular formation corrects the

    slow phase to return eyes to the

    last field of gaze.

    y slow componento is the direction of the flow of

    endolympho vestibular in origin.

    Classification

    y SPONTANEOUS NYSTAGMUS present w/opositional or other labyrinthine stimulation.

    y POSITIONAL NYSTAGMUS elicited byassuming a specific position as during

    positional testing. (Dix-Hallpike test)

    y INDUCED NYSTAGMUS elicited bystimulation. (ex. Caloric)

    y GAZE evoked nystagmus - always atdirection of gaze.

    Dix-HallpikeManeuver

    y diagnostic test for benign paroxysmalpositional vertigo

    y frenzeled glasses highly magnifies theocular movement

    y patient is asked to lie down and tilt thehead, check nystagmus

    y 10-15% nystagmus is central (from thebrain), 85% peripheral

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    Central Nystagmus

    y No Latencyy Lasts > 1 minutey Repeatabley Present in Multiple Head Positionsy Occassionally Absenty Multidirectional / Bizarrey 10 - 15 % of Vertigo Cases

    Peripheral Nystagmus

    y 5 - 15 Second Latencyy Disappears within 90 Secondsy Present in only 1 Head Positiony Chronically Presenty Unidirectionaly 85 % of Vertigo Cases

    VERTIGO/DIZZINESS

    y Most common symptoms of vestibulardysfunction

    y Subjective disturbance of integrity causedby contradictory sensory information

    processing.

    Peripheralvertigo

    y Function of a sensory system is impairedy outside the brain

    Centralvertigo

    y Central processing is impaired

    y within the brain

    y if vertigo is rotatory, with motioncomponents with otologic components,

    cause is otologic

    y if no otologic symptoms, it is vestibulary if vertigo is with obtundation,

    lightheadedness, giddiness, nonsystematic

    dizziness with no motion component, with

    neurologic symptoms (e.g. dysarthria,

    diplopia) with impaired consciousness,

    cause is neurologic

    y if without neurologic symptoms, it is amedical problem (e.g. diabetes,

    hypertension, electrolyte imbalance)

    y if vertigo lasts secondso during head movements, it is

    peripheral vestibular disorder

    o at rest, it is central vestibulardisorder or psychogenic

    y minutes

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    y principle: calcium crystals are floating in theposterior semicircular canal

    y just like in a snow globe, crystals fall on thehair cells, giving a sensation of movement in

    the absence of it (benign vertigo)

    y theEpley maneuver repositions thecrystalsthe various twists makes them

    exit the posterior semicircular canals

    Menieres disease

    y Triad of vertigo, tinnitus and fluctuatinghearingloss. * ear fullness.

    y Most cases idiopathicy Endolymphatic cochlear hydrops

    o Lermoyez phenomenono Tumarkin crisis

    y Low frequency hearing loss audiometryy Bed rest, anti emetics, anti vertigo meds.

    Differentialbasis ofvertigo

    the cause of this patients dizziness is vascular, in

    figure B, there is damage on the basilar artery

    patient has acoustic neuroma (tumor of the

    vestibulocochlear nerve at the cerebello-pontine

    angle) this will manifest as hearing loss, dizziness

    and disequilibrium

    APPROACHTOMANAGEMENT VERTIGO

    y Symptomatic reliefy Eliminate the underlying causey Rehabilitation

    TINNITUS

    y Represents perception of sound withoutexternal stimulus

    y Auditory sensation that occurs in theabsence of an external stimuli or electrical

    stimuli and has no subjective information

    content.

    y Mostly caused by disturbance of peripheralsensorineural structures.

    y Noise exposure, cranial trauma, COM,family history, ototoxic drugs.

    y Normal otoscopyClassification

    y Subjective tinnitus perceived by thepatient only.

    o Conductiveo Sensorineuralo Central

    y Objective tinnitus examiner is able toperceive the tinnitus.

    o Vascularo Myogenic

    y Pulsatile tinnitus coincident with thepulse.

    o Arterial etiologies: 1.AVFs/AVMs 2.Glomus tumors 3.Carotid stenosis 4.Atherosclerosis 5.Persistent stapedial artery 6.Intratympanic carotid

    artery

    7.Increased cardiac output pregnancy, thyrotoxicosis

    o Venous etiologies: 1.Venous hum 2.Pseudotumor cerebri 3.Jugular bulb anomalies

    o Non-vascular etiologies 1.Palatal myoclonus 2.Stapedial myoclonus 3.Vascular neoplasms of

    skull base/temporal boney Non-pulsatile tinnitus

    o typically subjective.o Most common form of tinnituso Most associated with hearing losso examples:

    Menieres disease ototoxicity noise exposure

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    Diagnosis

    1.History:

    y Describe soundy Durationy Other otologic symptoms (hearing loss,

    vertigo, otalgia, otorrhea)

    y Severityy Precipitating factors (noise, ototoxic drugs,

    trauma, infection etc.)

    2. PE:

    y Full head and neck examy Neuro-otologic examy Auscultation of ear canal, peri-auricular

    area, orbits, neck bruits.

    y Palatal or TM rhythmic contractions.y additional tests:

    o audiometryo USo CTo MRI/MRA/MRVo angiography

    Management

    y Treatment designed to eliminate tinnitus.(anatomic or systemic causes) ex. Surgery.

    y Treatment designed to reduce the severityof tinnitus. (insult to inner ear) ex. Acoustic

    therapy, lifestyle change.

    ____________END OF TRANSCRIPTION__________

    HI to reych, arabels, ana, quennie, eloh, jez,

    gemHappy studying!

    IMY

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