{"id":24316,"date":"2026-02-28T22:53:49","date_gmt":"2026-03-01T02:53:49","guid":{"rendered":"https:\/\/cliniqueomicron.ca\/angio-oedeme-hereditaire\/"},"modified":"2026-09-14T21:08:23","modified_gmt":"2026-09-15T01:08:23","slug":"hereditary-angioedema","status":"publish","type":"page","link":"https:\/\/cliniqueomicron.ca\/en\/angio-oedeme-hereditaire\/","title":{"rendered":"Hereditary Angioedema \u2013 Causes, Symptoms, and Treatment | Omicron Clinic"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"24316\" class=\"elementor elementor-24316\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f507b4a e-flex e-con-boxed e-con e-parent\" data-id=\"f507b4a\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-aced3d9 elementor-widget elementor-widget-html\" data-id=\"aced3d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>.oc-ico{display:inline-flex;vertical-align:-.18em;width:1.15em;height:1.15em;flex-shrink:0}.oc-ico svg{width:100%;height:100%;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;stroke:#323C52}.oc-ico.is-ok svg{stroke:#FF611C}.oc-ico.is-no svg{stroke:#9AA7B4}<\/style><style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap');\n\n.co-wrap * {\n  font-family: 'Poppins', sans-serif;\n  box-sizing: border-box;\n}\n\n.co-wrap {\n  max-width: 1100px;\n  margin: 0 auto;\n  padding: 30px 0 60px;\n  margin-top: 10px;\n}\n\n.co-label {\n  font-family: 'Cinzel', serif;\n  font-size: 14px;\n  font-weight: bold;\n  letter-spacing: 1px;\n  text-transform: uppercase;\n  color: #4D6577;\n  margin-bottom: 14px;\n  display: block;\n}\n\n.co-wrap h1 {\n  font-size: 32px;\n  font-weight: 500;\n  color: #323C52;\n  margin: 0 0 22px;\n  line-height: 1.2;\n  letter-spacing: 0.5px;\n}\n\n.co-intro {\n  font-size: 16px;\n  font-weight: 400;\n  line-height: 1.75;\n  color: #4D6577;\n  margin-bottom: 36px;\n  padding-bottom: 32px;\n  border-bottom: 1px solid rgba(77,101,119,.2);\n}\n\n.co-wrap h2 {\n  font-size: 20px;\n  font-weight: 600;\n  color: #323C52;\n  margin: 32px 0 12px;\n  letter-spacing: 0.3px;\n}\n\n.co-wrap p {\n  font-size: 15px;\n  font-weight: 400;\n  color: #4D6577;\n  line-height: 1.7;\n  margin-bottom: 14px;\n}\n\n.co-list {\n  list-style: none;\n  padding: 0;\n  margin: 12px 0 24px;\n}\n.co-list li {\n  font-size: 15px;\n  font-weight: 400;\n  color: #4D6577;\n  padding: 10px 14px 10px 38px;\n  margin-bottom: 8px;\n  border-radius: 6px;\n  position: relative;\n  background: rgba(77,101,119,.06);\n  border-left: 3px solid #4D6577;\n}\n.co-list li::before {\n  content: \"\u2713\";\n  position: absolute;\n  left: 12px;\n  font-weight: 700;\n  color: #4D6577;\n}\n\n.co-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 14px 0 22px;\n  font-size: 14px;\n  border-radius: 8px;\n  overflow: hidden;\n}\n.co-table thead tr {\n  background: #323C52;\n  color: #fff;\n}\n.co-table thead th {\n  padding: 11px 16px;\n  text-align: left;\n  font-weight: 600;\n  font-size: 13px;\n}\n.co-table tbody tr:nth-child(even) { background: rgba(77,101,119,.06); }\n.co-table tbody tr:nth-child(odd) { background: #fff; }\n.co-table td {\n  padding: 10px 16px;\n  color: #4D6577;\n  border-bottom: 1px solid rgba(77,101,119,.12);\n  font-size: 14px;\n}\n.co-table td:first-child {\n  font-weight: 600;\n  color: #323C52;\n}\n\n.co-infobox {\n  display: flex;\n  gap: 12px;\n  background: rgba(77,101,119,.06);\n  border-radius: 8px;\n  border-left: 4px solid #4D6577;\n  padding: 14px 18px;\n  margin: 18px 0 28px;\n  font-size: 14px;\n  font-weight: 400;\n  color: #4D6577;\n  line-height: 1.65;\n}\n.co-infobox .ico { font-size: 18px; flex-shrink: 0; }\n<\/style>\n\n<div class=\"co-wrap\">\n\n  <span class=\"co-label\">Medical condition<\/span>\n  <h1>Angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire<\/h1>\n<style>.oc-fiche-cta{margin:8px 0 34px;padding:22px 24px;border:1.5px solid rgba(50,60,82,.15);border-left:4px solid #FF611C;border-radius:12px;background:#F4F6F8;font-family:Poppins,sans-serif}.oc-fiche-cta-t{font-size:18px;font-weight:600;color:#323C52;margin:0 0 4px;line-height:1.35}.oc-fiche-cta-x{font-size:15px;color:#4D6577;margin:0 0 14px;line-height:1.55}.oc-fiche-cta-b{display:flex;flex-wrap:wrap;gap:10px}.oc-fiche-cta-b a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;box-sizing:border-box}.oc-fiche-cta-b .oc-p{background:#FF611C;color:#fff}.oc-fiche-cta-b .oc-p:hover{background:#E04E0C}.oc-fiche-cta-b .oc-s{background:#fff;color:#323C52;border:1.5px solid rgba(50,60,82,.25)}@media (max-width:600px){.co-wrap h1{font-size:24px;line-height:1.25;text-transform:none}.oc-fiche-cta{padding:18px 16px}.oc-fiche-cta-b a{flex:1 1 100%}body .co-wrap > .co-table,body .co-wrap > .co-table tbody,body .co-wrap > .co-table tr,body .co-wrap > .co-table td{display:block;width:100%;box-sizing:border-box}body .co-wrap > .co-table{min-width:0;table-layout:auto}body .co-wrap > .co-table thead{display:none}body .co-wrap > .co-table tr{margin:0 0 10px;border:1px solid rgba(77,101,119,.18);border-radius:8px;overflow:hidden}body .co-wrap > .co-table td{padding:9px 12px;border:0}body .co-wrap > .co-table td:first-child{font-weight:600;color:#323C52;background:rgba(77,101,119,.07)}#ocw{transform:scale(.8);transform-origin:bottom right}}<\/style><div class=\"oc-fiche-cta\" data-oc-cta=\"fiche-haut-consult\"><p class=\"oc-fiche-cta-t\">Obtenir un avis adapt\u00e9 \u00e0 votre situation<\/p><p class=\"oc-fiche-cta-x\">Consultation en clinique ou en t\u00e9l\u00e9consultation, partout au Qu\u00e9bec.<\/p><div class=\"oc-fiche-cta-b\"><a class=\"oc-p\" href=\"https:\/\/cliniqueomicron.ca\/rendez-vous\/\">Make an appointment<\/a><a class=\"oc-s\" href=\"https:\/\/cliniqueomicron.ca\/consultation-en-ligne\/\">Consult online<\/a><a class=\"oc-s\" href=\"tel:+15146063350\">514 606-3350<\/a><\/div><\/div>\n\n\n  <div class=\"co-intro\">\n    L'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire (AOH) est une maladie g\u00e9n\u00e9tique rare caract\u00e9ris\u00e9e par des \u00e9pisodes r\u00e9currents de gonflement sous-cutan\u00e9 et sous-muqueux impr\u00e9visibles. Ces crises touchent le plus souvent le visage, les membres, l'abdomen et les voies respiratoires sup\u00e9rieures. Sans traitement, une atteinte laryng\u00e9e peut \u00eatre fatale par asphyxie. La maladie est caus\u00e9e par un d\u00e9ficit ou un dysfonctionnement de l'inhibiteur de la C1-est\u00e9rase, une prot\u00e9ine r\u00e9gulatrice du syst\u00e8me du compl\u00e9ment et de la voie des kinines. Elle ne r\u00e9pond pas aux antihistaminiques ni aux cortico\u00efdes habituellement utilis\u00e9s dans l'allergie, ce qui en fait un diagnostic souvent retard\u00e9.\n  <\/div>\n\n  <h2>Quels sont les types d'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire ?<\/h2>\n  <p>Trois types principaux sont reconnus, se distinguant par leur m\u00e9canisme biochimique :<\/p>\n\n  <table class=\"co-table\">\n    <thead>\n      <tr>\n        <th>Type<\/th>\n        <th>Mechanism<\/th>\n        <th>Frequency<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td>Type I<\/td>\n        <td>Taux d'inhibiteur C1-est\u00e9rase bas (d\u00e9ficit quantitatif)<\/td>\n        <td>85 % des cas<\/td>\n      <\/tr>\n      <tr>\n        <td>Type II<\/td>\n        <td>Taux normal mais prot\u00e9ine non fonctionnelle (d\u00e9ficit qualitatif)<\/td>\n        <td>15 % cases<\/td>\n      <\/tr>\n      <tr>\n        <td>Type III<\/td>\n        <td>Inhibiteur C1-est\u00e9rase normal, mutation du facteur XII ou autre<\/td>\n        <td>Rare, affects women primarily<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n\n  <h2>What are the causes and transmission?<\/h2>\n  <p>L'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire est transmis selon un mode autosomique dominant, ce qui signifie qu'un seul g\u00e8ne mut\u00e9 suffit \u00e0 provoquer la maladie. Chaque enfant d'un parent atteint a 50 % de risque de d\u00e9velopper la maladie. Le g\u00e8ne responsable des types I et II est SERPING1, situ\u00e9 sur le chromosome 11, qui code pour l'inhibiteur de la C1-est\u00e9rase. Des mutations de novo sans ant\u00e9c\u00e9dent familial sont possibles dans environ 25 % des cas.<\/p>\n\n  <h2>Quels sont les d\u00e9clencheurs des crises ?<\/h2>\n  <p>Les \u00e9pisodes peuvent survenir spontan\u00e9ment ou \u00eatre provoqu\u00e9s par divers facteurs. Les identifier permet de r\u00e9duire la fr\u00e9quence des crises :<\/p>\n  <ul class=\"co-list\">\n    <li>Stress \u00e9motionnel intense ou anxi\u00e9t\u00e9 prolong\u00e9e<\/li>\n    <li>Minor physical trauma: tooth extraction, surgery, endoscopy, intubation<\/li>\n    <li>Infections, particuli\u00e8rement virales ou bact\u00e9riennes<\/li>\n    <li>M\u00e9dicaments : inhibiteurs de l'enzyme de conversion (IEC), contraceptifs oraux contenant des \u0153strog\u00e8nes<\/li>\n    <li>Efforts physiques intenses ou prolong\u00e9s<\/li>\n    <li>Fluctuations hormonales : pubert\u00e9, grossesse, m\u00e9nopause<\/li>\n    <li>Dans de nombreux cas, aucun d\u00e9clencheur identifiable<\/li>\n  <\/ul>\n\n  <h2>What are the symptoms?<\/h2>\n  <p>Les crises d\u00e9butent g\u00e9n\u00e9ralement par des prodromes (sensations de picotements, \u00e9ryth\u00e8me margin\u00e9 non prurigineux) puis \u00e9voluent vers un gonflement localis\u00e9. La dur\u00e9e habituelle d'une crise non trait\u00e9e est de 2 \u00e0 5 jours.<\/p>\n\n  <table class=\"co-table\">\n    <thead>\n      <tr>\n        <th>Location<\/th>\n        <th>Events<\/th>\n        <th>Risk level<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td>Sous-cutan\u00e9e (membres, visage)<\/td>\n        <td>Gonflement ferme, non prurigineux, non \u00e9ryth\u00e9mateux des mains, pieds, visage<\/td>\n        <td>Functional discomfort, non-vital<\/td>\n      <\/tr>\n      <tr>\n        <td>Abdominal<\/td>\n        <td>Douleurs abdominales intenses, naus\u00e9es, vomissements, diarrh\u00e9es, ascite transitoire<\/td>\n        <td>Often mistaken for a surgical emergency<\/td>\n      <\/tr>\n      <tr>\n        <td>Laryng\u00e9e<\/td>\n        <td>Dysphagie, modification de la voix, stridor, sensation d'\u00e9tranglement<\/td>\n        <td>Urgence vitale, risque d'asphyxie<\/td>\n      <\/tr>\n      <tr>\n        <td>G\u00e9nitale ou faciale<\/td>\n        <td>Gonflement des l\u00e8vres, de la langue, des organes g\u00e9nitaux<\/td>\n        <td>Variable selon l'extension<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n\n  <div class=\"co-infobox\">\n    <span class=\"ico\"><span class=\"oc-ico is-warn\" role=\"img\" aria-label=\"Attention\"><svg viewbox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3.5L2.5 20h19z\"\/><path d=\"M12 10v4.5\" style=\"stroke:#FF611C\"\/><path d=\"M12 17.3v.1\" style=\"stroke:#FF611C\"\/><\/svg><\/span><\/span>\n    <span>Toute crise d'angio-\u0153d\u00e8me touchant la gorge, la langue ou le larynx constitue une urgence m\u00e9dicale absolue. Les antihistaminiques et les cortico\u00efdes sont inefficaces dans l'AOH et ne doivent pas \u00eatre utilis\u00e9s en remplacement des traitements sp\u00e9cifiques. En cas de gonflement des voies respiratoires, appelez le 911 imm\u00e9diatement.<\/span>\n  <\/div>\n\n  <h2>Comment est-il diagnostiqu\u00e9 ?<\/h2>\n  <p>Le diagnostic repose sur la combinaison d'un tableau clinique \u00e9vocateur, d'ant\u00e9c\u00e9dents familiaux et d'un bilan biologique cibl\u00e9. Un d\u00e9lai diagnostique de plusieurs ann\u00e9es est fr\u00e9quent, la maladie \u00e9tant souvent confondue avec des allergies ou des douleurs abdominales d'origine inconnue.<\/p>\n  <ul class=\"co-list\">\n    <li>Dosage du taux de C4 : abaiss\u00e9 de fa\u00e7on persistante dans les types I et II, m\u00eame en dehors des crises, excellent test de d\u00e9pistage<\/li>\n    <li>Dosage quantitatif de l'inhibiteur C1-est\u00e9rase (C1-INH antig\u00e9nique) : bas dans le type I, normal dans le type II<\/li>\n    <li>Dosage fonctionnel de l'inhibiteur C1-est\u00e9rase : activit\u00e9 r\u00e9duite dans les types I et II<\/li>\n    <li>Dosage du C1q : normal dans l'AOH h\u00e9r\u00e9ditaire, ce qui le distingue de l'AOH acquis<\/li>\n    <li>Analyse g\u00e9n\u00e9tique de SERPING1 pour confirmation et conseil g\u00e9n\u00e9tique familial<\/li>\n    <li>Bilan \u00e0 r\u00e9p\u00e9ter chez l'enfant avant l'\u00e2ge d'un an car les r\u00e9sultats peuvent \u00eatre non concluants<\/li>\n  <\/ul>\n\n  <h2>What treatments are available?<\/h2>\n  <p>La prise en charge de l'AOH comprend trois volets compl\u00e9mentaires : le traitement des crises aigu\u00ebs, la prophylaxie \u00e0 court terme avant un geste \u00e0 risque et la prophylaxie au long cours pour r\u00e9duire la fr\u00e9quence des \u00e9pisodes.<\/p>\n  <ul class=\"co-list\">\n    <li>Traitement aigu de premi\u00e8re ligne : concentr\u00e9 d'inhibiteur C1-est\u00e9rase (Berinert, Ruconest) par voie intraveineuse, ou icatibant (Firazyr), antagoniste du r\u00e9cepteur B2 de la bradykinine, en injection sous-cutan\u00e9e<\/li>\n    <li>Traitement aigu de seconde ligne : plasma frais congel\u00e9 en l'absence de traitement sp\u00e9cifique disponible<\/li>\n    <li>Prophylaxie \u00e0 court terme avant chirurgie ou extraction dentaire : concentr\u00e9 de C1-INH 1 heure avant le geste<\/li>\n    <li>Prophylaxie au long cours : lanadelumab (Takhzyro), anticorps monoclonal anti-kallicr\u00e9ine en injection sous-cutan\u00e9e toutes les 2 \u00e0 4 semaines, ou concentr\u00e9 de C1-INH en injections bihebdomadaires<\/li>\n    <li>Anciens traitements prophylactiques : androg\u00e8nes att\u00e9nu\u00e9s (danazol) et acide tranexamique, moins utilis\u00e9s en raison de leurs effets ind\u00e9sirables<\/li>\n  <\/ul>\n\n  <h2>Daily life and follow-up<\/h2>\n  <p>Les patients atteints d'AOH doivent disposer en permanence d'un traitement d'urgence auto-injectable \u00e0 domicile et \u00eatre form\u00e9s \u00e0 son utilisation. Un plan d'action personnalis\u00e9 r\u00e9dig\u00e9 par le m\u00e9decin sp\u00e9cialiste, \u00e0 pr\u00e9senter en cas d'urgence, est fortement recommand\u00e9. L'\u00e9viction des d\u00e9clencheurs identifi\u00e9s, le suivi r\u00e9gulier par un immunologiste ou un allergologue sp\u00e9cialis\u00e9, et l'information des proches sur la conduite \u00e0 tenir en cas de crise laryng\u00e9e sont des \u00e9l\u00e9ments essentiels de la prise en charge.<\/p>\n\n  <h2>Where to consult in Quebec<\/h2>\n  <p>Clinique Omicron propose des consultations m\u00e9dicales dans ses points de service au Qu\u00e9bec. Face \u00e0 des \u00e9pisodes r\u00e9currents de gonflements inexpliqu\u00e9s, en particulier si les antihistaminiques sont inefficaces ou si des ant\u00e9c\u00e9dents familiaux similaires existent, nos professionnels de sant\u00e9 peuvent initier le bilan diagnostique et vous orienter vers le sp\u00e9cialiste appropri\u00e9.<\/p>\n\n<style>.co-disclaimer{font-size:13px;color:#8a9aaa;font-style:italic;border-top:1px solid rgba(77,101,119,.15);padding-top:24px;margin-top:40px;line-height:1.6;}<\/style>\n<p class=\"co-disclaimer\">The content of this page is provided for informational purposes only and is not intended to replace the advice of a qualified healthcare professional. Consult a physician for any symptoms, questions or decisions you may have regarding your health.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Condition m\u00e9dicale Angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire L&#8217;angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire (AOH) est une maladie g\u00e9n\u00e9tique rare caract\u00e9ris\u00e9e par des \u00e9pisodes r\u00e9currents de gonflement sous-cutan\u00e9 et sous-muqueux impr\u00e9visibles. Ces crises touchent le plus souvent le visage, les membres, l&#8217;abdomen et les voies respiratoires sup\u00e9rieures. Sans traitement, une atteinte laryng\u00e9e peut \u00eatre fatale par asphyxie. La maladie est caus\u00e9e par un&hellip;&nbsp;<a href=\"https:\/\/cliniqueomicron.ca\/en\/angio-oedeme-hereditaire\/\" rel=\"bookmark\">Read More \"<span class=\"screen-reader-text\">Hereditary Angioedema \u2013 Causes, Symptoms, and Treatment | Omicron Clinic<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"_metasync_otto_title":"Angio-\u0153d\u00e8me H\u00e9r\u00e9ditaire : Causes et Traitement | Clinique Omicron","_metasync_otto_description":"L'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire est une maladie rare causant des gonflements \u00e9pisodiques impr\u00e9visibles pouvant mettre la vie en danger. D\u00e9couvrez ses causes, son d...","_metasync_otto_keywords":"angio oedeme hereditaire, Clinique Omicron, clinique m\u00e9dicale Qu\u00e9bec, m\u00e9decin g\u00e9n\u00e9raliste Montr\u00e9al, Qu\u00e9bec","_metasync_otto_og_title":"","_metasync_otto_og_description":"L'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire est une maladie rare causant des gonflements \u00e9pisodiques impr\u00e9visibles pouvant mettre la vie en danger. D\u00e9couvrez ses causes, son d...","_metasync_otto_twitter_title":"","_metasync_otto_twitter_description":"","rank_math_title":"","rank_math_description":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_aioseo_title":"Angio-\u0153d\u00e8me H\u00e9r\u00e9ditaire \u2013 Causes, Sympt\u00f4mes et Traitement | Clinique Omicron","_aioseo_description":"L'angio-\u0153d\u00e8me h\u00e9r\u00e9ditaire est une maladie rare causant des gonflements \u00e9pisodiques impr\u00e9visibles pouvant mettre la vie en danger. 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