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Résumé UE 2.5 S3 : Infections respiratoire

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Il s'agit d'un cours réalisé dans la cadre de l'UE 2.5 S3

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UE 2.5 S3 INFECTIONS RESPIRATOIRES
Anatomie :
 Voies aériennes sup : cavités nasales jusqu’aux cordes vocales (rhinites,
laryngite, …)
 Voies aériennes inf : en dessous des cordes vocales (trachéite, bronchite,
pneumonie)

Infection respiratoire = inflammation infectieuse de l’appareil respiratoire.



BRONCHITE

Physiopathologie :
- Œdème de la muqueuse
- Hyperréactivité bronchique (= contraction muscles bronchiques)
- Hypersécrétion bronchique

Signes :
- Toux +/- productive
- Brulures thoraciques
- Sifflements

Rare grave sauf en cas de maladies respiratoire chronique (BPCO, asthme).
Contrairement à la pneumonie il n’y a pas de râle crépitant, ni d’image
radiographique.

Traitement symptomatique  paracétamol, +/- antitussifs, mucofluidifiants.
(ATB non nécessaire dans la grd majorité des cas)

Évolution : disparition de la toux dans ¾ en - 2 semaines.



PNEUMONIE

Physiopathologie :
- Alvéoles remplies de bactéries / pus / d’œdème
- Les échanges gazeux ne sont plus assurés à cet endroit

Signes :
- Fièvre
- Fatigue
- Toux
- Crachats sales
- Douleur de la poitrine

Diagnostic : imagerie du thorax (radio, scanner)

Facteurs de risques :
- Age : plus âgées = plus de risques
- Comorbidités : cardiovasculaires, respiratoires, diabète, insuffisance rénale,
démence, cancer
- Addictions : tabagisme, alcoolisme

1

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September 16, 2026
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