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Disponible en 10 langues." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-10" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">10 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D8%B6%D9%8A%D9%82_%D9%82%D8%B5%D8%A8%D9%8A" title="تضيق قصبي – arabe" lang="ar" hreflang="ar" data-title="تضيق قصبي" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Bronchokonstriktion" title="Bronchokonstriktion – allemand" lang="de" hreflang="de" data-title="Bronchokonstriktion" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Bronchoconstriction" title="Bronchoconstriction – anglais" lang="en" hreflang="en" data-title="Bronchoconstriction" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Broncoconstricci%C3%B3n" title="Broncoconstricción – espagnol" lang="es" hreflang="es" data-title="Broncoconstricción" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AA%D9%86%DA%AF%DB%8C_%D9%86%D8%A7%DB%8C%DA%98%D9%87" title="تنگی نایژه – persan" lang="fa" hreflang="fa" data-title="تنگی نایژه" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Bronchoconstrictie" title="Bronchoconstrictie – néerlandais" lang="nl" hreflang="nl" data-title="Bronchoconstrictie" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Broncoconstri%C3%A7%C3%A3o" title="Broncoconstrição – portugais" lang="pt" hreflang="pt" data-title="Broncoconstrição" data-language-autonym="Português" data-language-local-name="portugais" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Bronhokonstrikcija" title="Bronhokonstrikcija – serbo-croate" lang="sh" hreflang="sh" data-title="Bronhokonstrikcija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croate" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Bronhokonstrikcija" title="Bronhokonstrikcija – serbe" lang="sr" hreflang="sr" data-title="Bronhokonstrikcija" data-language-autonym="Српски / srpski" data-language-local-name="serbe" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Bronkkonstriktion" title="Bronkkonstriktion – suédois" lang="sv" hreflang="sv" 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id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="fr" dir="ltr"><div class="bandeau-container metadata bandeau-article bandeau-niveau-ebauche"><div class="bandeau-cell bandeau-icone" style="display:table-cell;padding-right:0.5em"><span class="noviewer" typeof="mw:File"><a href="/wiki/Fichier:Star_of_life2.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Star_of_life2.svg/35px-Star_of_life2.svg.png" decoding="async" width="35" height="35" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Star_of_life2.svg/53px-Star_of_life2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Star_of_life2.svg/70px-Star_of_life2.svg.png 2x" data-file-width="192" data-file-height="192" /></a></span></div><div class="bandeau-cell" style="display:table-cell;padding-right:0.5em"> <p><strong class="bandeau-titre">Cet article est une <a href="/wiki/Aide:%C3%89bauche" title="Aide:Ébauche">ébauche</a> concernant la <a href="/wiki/M%C3%A9decine" title="Médecine">médecine</a>.</strong> </p><p>Vous pouvez partager vos connaissances en l’améliorant (<b><a href="/wiki/Aide:Comment_modifier_une_page" title="Aide:Comment modifier une page">comment ?</a></b>) selon les recommandations des <a href="/wiki/Projet:Accueil" title="Projet:Accueil">projets correspondants</a>. </p> </div></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fichier:Blausen_0620_Lungs_NormalvsInflamedAirway.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Blausen_0620_Lungs_NormalvsInflamedAirway.png/220px-Blausen_0620_Lungs_NormalvsInflamedAirway.png" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Blausen_0620_Lungs_NormalvsInflamedAirway.png/330px-Blausen_0620_Lungs_NormalvsInflamedAirway.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/Blausen_0620_Lungs_NormalvsInflamedAirway.png/440px-Blausen_0620_Lungs_NormalvsInflamedAirway.png 2x" data-file-width="1024" data-file-height="768" /></a><figcaption>Illustration 3D d'une bronchoconstriction par contraction des muscles lisses ("smooth muscle") des bronches </figcaption></figure> <p>La <b>bronchoconstriction</b> est le rétrécissement du calibre des <a href="/wiki/Bronches" class="mw-redirect" title="Bronches">bronches</a> à cause d'une contraction des muscles bronchiques. </p><p>La bronchoconstriction est due à la fixation de l'<a href="/wiki/Ac%C3%A9tylcholine" title="Acétylcholine">acétylcholine</a><sup class="need_ref_tag" style="padding-left:2px;"><a href="/wiki/Aide:R%C3%A9f%C3%A9rence_n%C3%A9cessaire" title="Aide:Référence nécessaire"><span title="Ce passage nécessite une référence ; voir l'aide.">[réf. nécessaire]</span></a></sup> sur les récepteurs induisant une contraction des <a href="/wiki/Muscle_lisse" title="Muscle lisse">muscles lisses</a> des <a href="/wiki/Bronche" title="Bronche">bronches</a> au niveau des <a href="/wiki/Poumon" title="Poumon">poumons</a>. Elle crée une obstruction des bronches qui peut entrainer une <a href="/wiki/Dyspn%C3%A9e" title="Dyspnée">difficulté respiratoire</a>. Elle est l'une des manifestations importante de l'<a href="/wiki/Asthme" title="Asthme">asthme</a> mais s'observe aussi, entre autres dans la <a href="/wiki/Broncho-pneumopathie_chronique_obstructive" class="mw-redirect" title="Broncho-pneumopathie chronique obstructive">BPCO</a>. </p><p>Elle peut aussi être causée par une concentration trop forte en <a href="/wiki/Facteur_d%27activation_plaquettaire" title="Facteur d'activation plaquettaire">facteur d'activation plaquettaire</a> (PAF). </p><p>Les principaux signes de bronchoconstriction sont les <a href="/wiki/Sibilance" title="Sibilance">sibilances</a> à l'<a href="/wiki/Auscultation" title="Auscultation">auscultation</a>. 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