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Middle Ear Barotrauma

2021· article· en· W3049358493 sur OpenAlex

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Notice bibliographique

RevueStatPearls · 2021
Typearticle
Langueen
DomaineMedicine
ThématiqueEar Surgery and Otitis Media
Établissements canadiensCanadian Armed Forces
Organismes subventionnairesnon disponible
Mots-clésOssiclesMiddle earStapesAnatomyCochleaSacculeEardrumInner earOval windowUtricleIncusMalleusMedicineEustachian tubeVestibular systemPerilymphRound windowAudiology
DOInon disponible

Résumé

récupéré en direct d'OpenAlex

Otic Barotrauma (OBT) or ear barotrauma is a tissue injury to the ear secondary to inadequate pressure equalization between gas-filled body spaces and the external environment. Eustachian tube dysfunction (ETD) and middle ear barotrauma (MEBT) remain the most common complication of diving and clinical hyperbaric oxygen treatment (HBO).The outside portion of the ear, the pinna, is composed primarily of ridged cartilage covered by skin. The external auditory meatus, or the opening to the external auditory canal (EAC), extends toward and ends at the tympanic membrane (TM). Posterior to the TM is the air-filled middle ear space containing three bony ossicles: the malleus, incus, and stapes. The umbo is the distal portion of the malleus and connects the bony ossicles to the TM. It is an expected anatomical finding on otoscopy and easily visualized. The other ossicles are visible when favorable anatomical conditions are present, such as a transparent TM. The third ossicle, the stapes, abuts the oval window, leading into the inner ear space. The inner ear space, containing the auditory (cochlea) and vestibular (semi-circular canals, utricle, and saccule) systems, is separated from the middle ear by the oval and round (labyrinthine) windows. The cochlea is responsible for sound transmission and is composed of three fluid-filled compartments: the scala vestibuli and scala tympani containing perilymph; and the scale media containing endolymph. The vestibular system, which is continuous with the cochlea, is responsible for spatial orientation and balance. The middle ear space is covered by mucosa and is connected to the throat via the eustachian tube (ET), also referred to as the auditory tube. The ET opens just beyond the nasal openings in the posterior nasopharynx, allowing the drainage of fluid produced in the middle ear space. It is also responsible for the exchange of air between the nasopharynx and the middle ear space, maintaining equal pressure between the middle ear and the EAC. This is known as the equalization of the middle ear pressure. It is important to note that while equalization of the middle ear via the ET on ascent is passive, it requires an active maneuver on descent. Another less described air exchange takes place via the middle ear mucosa and mixed venous circulation. However, this transmucosal gas exchange is less important during rapid and large changes in ambient pressure occurring during diving, flying, or when being treated in a hyperbaric chamber.Sound waves travel via the EAC producing TM vibration, which is then carried through, and amplified by, the bony ossicular chain. The stapes moves in and out against the thin membrane of the oval window, causing vibration and turbulence of the perilymph fluid within the cochlea, producing a wave of motion. The turbulence of the perilymph continues to the scala tympani and on to the round window where sound pressure is dissipated. This dissipation of pressure at the round window becomes an important factor in inner ear barotrauma (IEBT). Perilymph turbulence within the cochlea results in a shift of the basilar membrane, upon which sits the Organ of Corti. Movement of the mechanosensory hair cells in the Organ of Corti results in sound transmission in the form of nerve impulses, which are received by the central nervous system via the eighth cranial nerve. While most minor damage secondary to MEBT heals rapidly and uneventfully, major trauma, such as a perforation of the TM or IEBT may take weeks or months to heal. Significant barotrauma may be associated with permanent complications such as hearing and balance deficits. This is why it is important that divers, passengers of pressurized aircraft, and clinical hyperbaric patients be taught and understand how to equalize middle ear pressure often and early during the course of pressurization. Prevention and recognition of ETD and MEBT remain important when evaluating and treating a pressure-related injury.

Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.

Prédiction distillée sur la base complète

Imitation des enseignants

Ni prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.

score de la tête « metaresearch » (Codex)0,000
score de la tête « metaresearch » (Gemma)0,000
Version: codex-gemma-dda1882f352aStatut de validation: machine_predicted_unvalidated
Catégories candidatesCharge utile insuffisante (le modèle a refusé de juger)
Catégories consensuellesCharge utile insuffisante (le modèle a refusé de juger)
DomaineSignal candidat: aucune · Signal consensuel: aucune
Devis d'étudeSignal candidat: Observationnel · Signal consensuel: Observationnel
GenreSignal candidat: Empirique · Signal consensuel: Empirique
Score de désaccord entre enseignants0,245
Score d'incertitude au seuil1,000

Scores Codex et Gemma par catégorie

CatégorieCodexGemma
Métarecherche0,0000,000
Méta-épidémiologie (sens strict)0,0000,000
Méta-épidémiologie (sens large)0,0000,000
Bibliométrie0,0000,000
Études des sciences et des technologies0,0000,000
Communication savante0,0000,000
Science ouverte0,0000,000
Intégrité de la recherche0,0000,000
Charge utile insuffisante (le modèle a refusé de juger)0,0030,001

Scores machine (provisoires)

Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.

Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.

Tête enseignante Opus0,048
Tête enseignante GPT0,273
Écart entre enseignants0,225 · la distance entre les deux têtes enseignantes sur ce seul travail
Statut de validationscore_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle