Trauma Flashcards
What structures make up the external ear?
Pinna/auricle and external auditory canal
What is the pinna and what is it also known as?
The visible part of the ear made up of folds of cartilage with a fatty lobule.
Also known as the auricle.
What manoeuvre do you need to do in order to clearly see the tympanic membrane?
Pull the ear posteriorly and superiorly.
What membranes line the inner ear?
Mucous membranes
What is the function of the inner ear?
To amplify and transmit sound to energy
What is the normal appearance of the tympanic membrane?
Pink/grey colour
What are the ossicles?
The three bones of the middle ear:
- Malleus
- Incus
- Stapes
What are the two muscles in the middle ear?
1) Tensor tympani
2) Stapedius
What cranial nerve lies in the middle ear?
VII Facial Nerve
The inner ear is located in the _______ part of the temporal bone and contains the _______, the ____-_______ ______, the ______ and the ______.
- Petrous
- Cochlear
- Semi-circular canals
- Saccule
- Utricle
What is the role of the inner ear?
Detects movement.
What is the auricle surrounded by and what does it contain?
The perichondral layer that contains the blood vessels that supply the cartilage.
What can a pinna haematoma lead to?
Separation of the perichondrium from the cartilage causing stasis of blood and avascular necrosis
What is the management of a pinna haematoma?
- Drainage of the haematoma as much as possible
- Give abx
- Large bulky ear dressing
- Refer to ENT for follow-up
What happens to the ear when a pinna haematoma isn’t treated properly?
Cauliflower ear
What anaesthesia do you use for trauma to the auricle?
Posterior auricular block
What is the difference between pinna cellulitis and pinna perichondritis?
Cellulitis affects the entire ear whereas in perichondritis you get sparing of the earlobe as it doesn’t contain any cartilage.
What is the treatment for pinna cellulitis and pinna perichondritis?
IV (important that it is IV) abx
What bacteria are usually the cause of pinna cellulitis, pinna perichondritis and otitis externa?
- Staph aureus
- Pseudomonas
What is polychondritis? (In reference to the ear)
A systemic inflammatory condition which tends to be bilateral perichondritis and is also milder and has nasal involvement
What is otitis externa?
Infection and inflammation of the external auditory canal caused by bacteria and fungi.
What are the risk factors for otitis externa?
- Swimming
- Underlying skin conditions
- Diabetes
What is the presentation of otitis externa?
- Ear pain
- Thick yellow discharge
- Conductive hearing loss
- Tinnitus and/or vertigo
What is the worry with otitis externa?
That it progresses to necrotising/malignant otitis externa
What can happen when you get granulation of tissue in otitis externa?
This can lead to osteomyelitis of the temporal bone which can lead to meningitis and encephalitis
Under what circumstances should you consider a CT scan in a patient with otitis externa?
- Diabetic
- Recurrent infections
- Over 65
What is the treatment for otitis externa?
Steroid drops with abx
What should you do if a patient has a bug in their ear canal?
- Kill the bug with mineral oil or lidocaine
- Attempt to remove
- If unable to remove refer to ENT as an emergency
Even though most tympanic membrane perforations heal by themselves, why do patients need a follow-up in an ENT clinic?
To get their hearing tested
Under what circumstances do tympanic membrane perforations occur?
- Middle ear pressure secondary to fluid build-up as a result of infection
- Trauma
Why should you avoid gentamycin drops when treating a tympanic membrane perforation?
It can be toxic to the middle and inner ear.
What are the commonest pathogens causing otitis media?
- Strep pneumoniae
- Haemophilus influenzae
What is a common presentation of otitis media?
Children 3-6 years old following a recent upper respiratory tract infection suffering from:
- Earache
- Hearing loss
- Fever
- Deafness
- Irritability
- Lethargy
What are you likely to see when examining the ear in a suspected otitis media?
An inflamed and bulging tympanic membrane with loss of light reflex
What are the complications of otitis media?
- Drum perforation
- Secondary acute mastoiditis
What do most doctors tend to do when treating otitis media?
Give a delayed prescription of abx if there has been no improvement in 72 hours
What causes acute mastoiditis?
A build-up of purulent exudate within the middle ear blocking the entrance to the mastoid antrum. The pus moves into the air cells of the mastoid process leading to infection.
What is the presentation of acute mastoiditis?
Red hot lump over the mastoid process behind the ear with forward displacement of the pinna
What are the three causes of peripheral vertigo?
1) BPPV (benign paroxysmal positional vertigo)
2) Labyrinthitis/Vestibular neuritis
3) Meniere’s disease
What is BPPV?
Benign Paroxysmal Position Vertigo is a peripheral vertigo characterised by shot, sudden onset of vertigo associated with head movements.
What causes BPPV?
A small crystal of calcium carbonate (called an otoconia) enters the semi-circular canals of the inner ear creating an illusion of movement/exacerbating the perception of movement by irritating the hair cells that line the inner ear.
What are the two manoeuvres you use in suspected BPPV?
1) Hallpike test to confirm
2) Epley’s manoeuvre to remove the otoconia
What is labyrinthitis/vestibular neuritis and what does it present with?
A type of peripheral vertigo that presents as constant vertigo over hours or days. It presents with nausea and vomiting following a viral infection
What is Menirere’s disease?
A type of peripheral vertigo characterised by gradual, short episodes of vertigo associated with hearting loss, pressure sensation in the ear and tinnitus.
What is Kiesselbach’s plexus?
A vascular network of five arteries that supply the nasal septum.
What does Kiesselbach’s plexus lie in?
Little’s/Kiesselbach’s area
At what point in the nose do branches of the internal and external carotid arteries anastamose?
Little’s/Kiesselbach’s area
What is the anterior bloody supply to the nose?
Branches of the internal carotid
What is the posterior blood supply to the nose?
Distal branches of the external carotid
Where do 90% of anterior epitaxies occur from?
Little’s/Kiesselbach’s area