Rhinology Flashcards
What is the differential diagnosis list for someone who presents with a blocked nose?
Physiological - Nasal cycle Congenital - e.g. choanal deformity Traumatic - e.g. septal deformity Infective rhinitis Allergic rhinitis Non-allergic rhinitis Nasal polyps Adenoidal hypertrophy in children Malignancy of nose, sinus or postnasal space
What is the normal nasal cycle?
The often unnoticeable alternating partial congestion and decongestion of the nasal cavities. This has benefits both in breathing and smelling.
What is choanal atresia?
A congenital nasal defect, which occurs when there is failure of the bucconasal membrane to rupture and therefore the nasal cavities remain separate from the nasopharynx.
Is choanal atresia normally unilateral or bilateral?
Unilateral and as a result might not present until later in life. If a patient is born with bilateral choanal atresia then the newborn will have severe respiratory difficulties. Remember that newborns are obligate nose breathers.
Is choanal atresia more common in males or females?
Twice as common in females as males.
What other congenital abnormalities are associated with choanal atresia?
CHARGE association: Coloboma Hearing deficit choanal Atresia (particularly bilateral) Retardation of growth Genital defects (in males) Endocardial defects
What are the clinical features of choanal atresia?
Breathing difficulty Cyanosis within hours of birth Obstruction is relieved by crying as the baby begins to breathe through mouth Obstruction is worsened by attempts at feeding Other congenital abnormalities
How do you diagnose choanal atresia?
Failure to pass a naso-endoscope or Foley catheter through the nose into the nasopharynx confirms the diagnosis. CT scanning will help in determining the extent of the anatomical abnormality.
How do you manage a patient born with choanal atresia?
Airway control - oropharyngeal airway. However this is temporary as feeding is prevented. Devices such as the McGovern nipple allow feeding and airway maintenance. Surgical management - The atretic plate may be removed as soon as is possible. Fibreoptic endoscopy has made early intervention in neonates much easier.
What is a nasal dermoid cyst?
A dermoid cyst is a teratoma of a cystic nature that contains an array of developmentally mature, solid tissues. It frequently consists of skin, hair follicles, and sweat glands. In the nose, they usually form a midline mass on the dorsum of the nose which presents in childhood.
How do you manage someone with a nasal dermoid cyst?
MRI is performed to rule out cranial extension prior to surgical excision. Cranial extensions include gliomas or encephalocoeles both of which can also come down into the nose and hence look like a dermoid cyst.
When someone presents with a history consistent with a nasal bone fracture, what is it important to exclude as a complication?
Septal injuries and septal haematoma
How do you manage a displaced nasal bone fracture?
Usual strategy is to manipulate the bones back into place under anaesthetic (MUA). It is most effective if done in the first two weeks since injury.
What are the complications of a nasal septal haematoma?
Septal necrosis and abscess formation can lead to collapse of support for the tip of the nose and an ugly saddle deformity.
What symptoms would alert you to the presence of a nasal septal haematoma?
Severe bilateral nasal blockage. This is rare following more simple injuries. Also pain that worsens rather than decreases over the following few days may indicate the formation of a septal abscess.
What might you see on examination of a nose with a suspected septal haematoma?
A cherry red fluctuant swelling of the anterior part of the septum - usually bilateral - which is soft when pressed with a cotton bud.
How do manage a patient with a nasal septal haematoma?
This is an ENT emergency to avoid necrosis. The haematoma needs to be drained via an intranasal incision under local anaesthetic. Afterwards the nose is packed to prevent reaccumulation of the blood. Prophylactic antibiotics are also given orally.
What are local (to the nose) causes of epistaxis (nose bleed)?
Nose picking External trauma Infection Drying of the mucosa Effects of ageing on blood vessels Septal perforation Tumours
What are the systemic causes of epistaxis (nose bleed)?
Platelet factors - thrombocytopenia
Clotting abnormalities - eg haemophilia, von Willebrand’s disease, liver disease
Medication - anti-platelet, anti-coagulant
Hereditary haemorrhagic telangiectasia - rare abnormal vessle formation in skin, mucous membranes and often organs such as lung, liver and brain: can lead to increase in nose bleeds and red spots on lips, nose and fingers
Hypertension
Leukaemia
What is the single most common cause of epistaxis?
Idiopathic
Why does the nose have such a prolific vascular supply?
Rapid humidification and warming of inspired air
What are the four main arteries whose branches make up Little’s area in the nose?
LEGS:
superior Labial artery (from the facial artery)
anterior Ethmoidal artery (from the ophthalmic artery)
Greater palatine artery (from the maxillary artery)
Sphenopalatine artery (terminal branch of the maxillary artery)
What is another name for Little’s area in the nose?
Kiesselbach’s plexus
Describe the differences between anterior and posteriro epistaxis
Anterior: more common, occurs in children and young aduls, usually due to mucosal dryness, alarming as bleeding seen readily but usually less severe
Posterior: Usually older population, HTN and ASVD are most common causes, significant bleeding in posteror pharynx, more severe and treatment challenging - typically brittle vessles
