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Why not share! Otitic barotrauma by Dr Manohar Sur Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Full Name Comment goes here. Are you sure you want to Yes No. Ankur Dhanani. Keerthi Varma. No Downloads. Views Total views. Actions Shares.
Embeds 0 No embeds. No notes for slide. Otitic barotrauma is a pathological conditions of the ear induced by pressure changes. Physiological consequencies of compression descent Eustachian tube passive egress of air from middle ear to the pharynx if the middle ear pressure is high.
When atmospheric pressure is higher than that of middle ear by critical level of 90mm of Hg eustachian tube gets locked. In presence of Eustachian tube oedema, even in small pressure difference locking of the tube occur. Negative pressure in the middle ear causes transudation or blood, then even rupture of the tympanic membrane occurs.
Physiological consequences of decompression ascent During ascent, as the middle ear pressure exceeds that of the ambient pressure, passive ventilation of air through the Eustachian tube into pharynx occurs. As a result the usual passive ventilation,which should occur during subsequent ascent, can no longer take place.
To continue ascending in these circumstances would result in a relatively positive middle ear pressure compared to the ambient pressure, causing outward bulging of the tympanic membrane.
This is accompanied by an inward force on the round window membrane. It is possible to occur perilymphatic fistula. Clinical features of otitic barotrauma 1 Compression descent injuries 2 Injuries at the stable pressure; 3 decompression ascent injuries. Compression descent injuries 1. This may be cerumen, earplugs,foreignbody or exostoses. As result, the pressure gradient across the tympanic membrane results in it being displaced outwards.
If this is with sufficient force, the perforation may occur. Main symptom is of pain, increasing with depth. Initial symptoms is the sensation of a blocked ear with a strong desire to equalize.
This progress to the predominant symptom of otalgia. Myringoplasty is indicated in those fail to heal spontaneously. Inner ear barotrauma : three pathological entities inner ear resulting from compression barotruama. These are: a inner ear haemorrhage; b labyrinthine membrane tears; 3. A good recovery would be expected. Non-occluded ear: In the normally ventilated ears, the inner ear more susceptible to decompression ascent trauma.
Treatment : -steroids for moderate to severe hearing losses. Advice to the patient: -scuba driving contraindicated if persistent problems. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later.
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Surfer's ear is the common name for an exostosis or abnormal bone growth within the ear canal. Surfer's ear is not the same as swimmer's ear , although infection can result as a side effect. Irritation from cold wind and water exposure causes the bone surrounding the ear canal to develop lumps of new bony growth which constrict the ear canal. Where the ear canal is actually blocked by this condition, water and wax can become trapped and give rise to infection. The condition is so named due to its prevalence among cold water surfers. Warm water surfers are also at risk for exostosis due to the evaporative cooling caused by wind and the presence of water in the ear canal.
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