ENT Flashcards

1
Q

Hallmarks of Facial Nerve Palsy ??

A

Main nerve supplying the str. of 2nd Embryonic Branchial arch
- Predominantly an EFFERENT nerve to muscles of Facial expression, Digastric muscle & also glandular str.
- Few Afferent fibres: Originate in Geniculate ganglion & are concerned with Taste
SUPPLY (Face, Ear, Taste, Tear)
- Face: facial expression muscles
- Ear: Nerve to Stapedius
- Taste: Supplies to anterior 2/3rd
- Tear: Parasympathetic fibres to lacrimal glands & Salivary glands

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2
Q

Causes of B/L CN-7 palsy ??

A

Sarcoidosis
GBS
Lyme’s Disease
B/L Acoustic Neuroma (as in NF-2)
BELL’S Palsy (25% of B/L cases but this represents 1% of total Bell’s palsy cases)

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3
Q

Causes of U/L CN-7 palsy ??

A

LMN Lesions
- Bell’s Palsy
- Ramsay-Hunt syndrome (HZV)
- U/L Acoustic Neuroma
- Parotid Tumour
- HIV, - MS, - DM
UMN Lesion
- Stroke
- MS

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4
Q

UMN vs LMN lesion ??

A

UMNL ‘spares’ upper face ie Forehead
LMNL affects all facial muscles

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5
Q

Facial Nerve Course/ Path

A

SUBARACHNOID Path
- Origin: Motor- Pons, Sensory- Nervus Intermedius
- Pass through Petrous Temporal bone into Internal Auditory Meatus with CN-8.
- Here it combines to become FN
FACIAL CANAL Path
- Canal passes superior to vestibule of inner ear
- At the middle part of middle ear, it gets wider, contains Geniculate G
- 3 branches: Greater Petrosal N, Nerve to Stapedius, Chorda tympani (Sensory Taste)
STYLOMASTOID Foramen
- Passes through SMF (Tympanic cavity anterior & Mastoid antrum posteriorly)
- Posterior Auricular N & Branch to POSTERIOR Belly of Digastric & Stylohyoid muscle

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6
Q

Hallmarks of Bell’s Palsy ??

A

Acute U/L, Idiopathic, CN-7 palsy
- HSV might be the cause
- Peak Incidence: 20-40 yrs
- MC in Pregnant women
C/F -
LMN Lesion of FN- Forehead affected
Post-auricular pain (may precede paralysis), Altered taste, Dry eyes, Hyperacusis

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7
Q

Rx. of Bell’s Palsy ??

A

Oral Predinosolone within 72 hrs of onset of Bell’s palsy
NICE
- Anti-Viral Rx. with CS may have a small benefit, but seek specialist advice if this is being considered
UpToDate : recommends addition of Anti-virals for Severe FN Palsy
Eye Care (to prevent E Keratopathy)
- Artificial tear & Eye lubricants
- Taping with micropore: If unable to close eye at bedtime

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8
Q

Follow up & Prognosis of Bell’s Palsy ??

A

If paralysis shows NO sign of improvement after 3 wks
- Urgent referral to ENT
If more long standing weakness (for several months)
- Plastic Sx. referral
Most people fully recover in 3- 4 months
- If untreated, 15% of pts. have permanent moderate to severe weakness

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9
Q

What is Ramsay Hunt Syndrome ??

A

Herper Zoster OTUCUS is caused by
- Reactivation of VZV in the Geniculate ganglion of CN-7
C/F-
- 1st c/f : Auricular pain
- FN palsy
- Vesicular Rash around Ear
- Vertigo, Tinnitus
Rx.- Oral Aciclovir + Corticosteroids

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10
Q

Rinne’s & Weber’s test

A

Rinne’s Test
- Tuning fork is placed over the mastoid process until the sound is no longer heard, followed by repositioning just over EAM
- (+)ve Rinne’s: AC normally better than BC
- (-)ve Rinne’s: BC > AC then Conductive deafness
Weber’s Test
- U/L SNHL : Sound localised to NORML Ear
- U/L Conductive deafness: Localised to Affected ear

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11
Q

Interpretation of Rinne’s & Weber’s test ??

A

Type = Rinne’s = Weber’s
1) Normal = AC>BC = Midline
2) Conductive HL = BC>AC in affected ear & AC>BC in normal ear = Lateralised to Affected ear
3) SNHL = AC>BC = Lateralised to Unaffected/ Normal ear

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12
Q

Hallmarks of Otosclerosis ??

A

Replacement of Normal bone by VASCULAR Spongy Bone.
- Causes Progressive conductive deafness due to Stapes fixation to Oval window
- A D & Typically affects Young adults
- FHx present
- Previous Measles infection is a RF

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13
Q

Features of Otosclerosis ??

A

Onset at 20-40 yrs:
- Conductive HL
- Tinnitus
- Normal T Memb.: 10% pts. may have ‘Flamingo tinge’ due to Hyperaemia
Rx.-
- Hearing aid
- Stapedectomy

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14
Q

Hallmarks of Otitis Externa ??

A

Causes
- Infection: Bacterial (Staph. aureus, P aeruginosa) or Fungal
- Seborrhoeic Dermatitis
- Contact Dermatitis (allergic or Irritant)
- Recent Swimming (common trigger)
Features
- Ear pain
- ITCH & Discharge
- Otoscopy: Red, swollen, or Eczematous

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15
Q

Rx. of Otitis Externa ??

A

Initial Rx.-
- Topical Abx. or Topical Abx. + Steroids
- If T memb. is perforated, Aminoglycosides are not used
- Remove if any canal debris
- Canal extensively swollen: Insert an ear wick
SECOND Line Rx.-
- Consider Contact dermatitis 2ndary to Neomycin
- Oral FLUCLOXACILLIN (if spreading)
- Take Ear swabs from ear canal
- Empirical use of Anti-Fungals
If FAILS to respond to Topical Abx., pt. should be REFERRED to ENT

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16
Q

Malignant Otitis Externa ??

A

MC in Elderly DM pts.
In this condition, there is
- Extension of infection into bony ear canal &
- Soft tissues deep to bony canal involved
Rx.- IV Antibiotics required

17
Q

Hallmarks of Tinnitus ??

A

Perception of sounds in the ears or head with no external stimuli
CAUSES
Idiopathic (cause will not be found in majority of pts.)
Meniere’s Disease
- a/w HL, Tinnitus, Aural fullness or pressure
Otosclerosis
Sudden Onset SNHL (SSNHL)
Hearing Loss
- Excessive loud noise & Presbycusis
DRUGS
Impacted wax

18
Q

Assessment of Tinnitus ??

A

Audiological assessment
- Detect underlying HL
IMAGING
MRI Scan
- Non-pulsatile + U/L or other Neuro./ Otological signs
MRA
- Pulsatile Tinnitus

19
Q

Rx. of Tinnitus ??

A

Ix. & Treat any underlying Cause
Amplification Devices
- More beneficial if a/w HL
Psychological therapy - CBT
Tinnitus Support group

20
Q

What is Sudden onset SNHL ??

A

Seen in
- Acoustic neuroma
HL, Vertigo, Tinnitus
ABSENT Corneal reflex
a/w NF-2

21
Q

Drug causes of Tinnitus ??

A

Aspirin or NSAIDs
Aminoglycosides
Loop Diuretics
Quinine

22
Q

Hallmarks of Meniere’s Disease ??

A

Excessive pressure + Progressive Dilation of Endolymphatic system
- MC in Middle-aged adults
Features
- Recurrent episodes of D(SNHL)VT
- Aural Fullness
- Nystagmus + (+)ve Romberg’s
- Episodes last: Min to Hrs
- Typically U/L features but B/L can also occur after several years

23
Q

Rx. of Meneire’s Disease ??

A

Resolve in maj. pts. after 5- 10 yrs & will be left with a degree of HL
Rx
- ENT assessment ro confirm Dx.
- Pt. should inform DVLA (Stop driving till satisfactory control of c/f achieved.
ACUTE attacks:
- Prochlorperazine (Buccal or IM)
- Admission may be required sometimes
PREVENTION
- Betahistine & Vestibular rehabilitation exercises

24
Q

Hallmarks of Vestibular Neuronitis ??

A

Vertigo seen after a Viral infection
Features
- Recurrent Vertigo
- Lasts for Hrs. to Days
- Horizontal Nystagmus
- NO HL or Tinnitus
DDs
- Viral Labyrinthitis
- Posterior Circulation Stroke

25
Q

Rx. of Vestibular Neuronitis ??

A

1) Acute Rx. for Severe cases
- Prochlorperazine (Buccal or IM)
2) Less severe cases
- Short oral course of Prochlorperazine or Antihistamine (Cinnarizine, Cyclizine, Promethazine)
3) Chronic symptoms
- Vestibular Rehabilitation Exercises

26
Q

Hallmarks of BPPV ??

A

Sudden onset of Dizziness & Vertigo triggered by changes in Head position
- Age of onset: 65 yrs
Rx.-
Symptomatic Relief
- EPLEY Manoeuvre (successful in 80%)
- Brandt-Daroff exercise (self exercise at home- Vestibular rehabilitation)
Medications
- Betahistine (limited value)

27
Q

How to distinguish b/w Peripheral & Central causes of Acute Vestibular syndrome particularly to exclude Posterior circulation stroke ??

A

HiNTS examination (100% sensitive & 96& specific for Peripheral causes of vertigo)
1) Head impulse
A (+)ve test [corrective saccade (+)ve] indicates a Disruption in Vestibulo-Ocular reflex, ie., it is a peripheral cause of Vertigo
- Peripheral Vertigo: Abnormal
- Central vertigo: Normal
2) Nystagmus
- PV : None/ Unidirectional
- CV : Bi-directional or Vertical
3) Test of Skew
Abnormal eye movt. such as Vertical Diplopia
- PV : No Vertical Skew
- CV : Vertical Skew