{"id":10147,"date":"2026-04-02T19:31:35","date_gmt":"2026-04-02T19:31:35","guid":{"rendered":"https:\/\/cardiocases.com\/?post_type=ecg_case&#038;p=10147"},"modified":"2026-04-02T20:23:19","modified_gmt":"2026-04-02T20:23:19","slug":"trace-5-2-extrasystole-atriale","status":"publish","type":"ecg_case","link":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-5-2-extrasystole-atriale\/","title":{"rendered":"Trac\u00e9 5.2: Extrasystole atriale"},"content":{"rendered":"","protected":false},"featured_media":10146,"template":"","ecg_case_type":[254],"language_ecgcase":[259],"class_list":["post-10147","ecg_case","type-ecg_case","status-publish","has-post-thumbnail","hentry","ecg_case_type-extrasystoles","language_ecgcase-french"],"acf":{"ecg_case_title":"Trac\u00e9 5.2: Extrasystole atriale","patient_description":"Homme de 67 ans sans ant\u00e9c\u00e9dent particulier; ECG r\u00e9alis\u00e9 pour un bilan d\u2019assurance","quiz_question":"Sur cet ECG, on retrouve:","quiz_answer_1":"un rythme de base sinusal","quiz_answer_2":"2 extrasystoles atriales","quiz_answer_3":"2 extrasystoles jonctionnelles","quiz_answer_4":"2 extrasystoles ventriculaires","quiz_answer_5":"un bloc de branche droit","correct_answer":["A","B"],"ecg_image":10146,"ecg_description":"L\u2019activit\u00e9 atriale est sinusale avec une dur\u00e9e normale de l\u2019espace PR et du complexe QRS; on retrouve 2 battements ventriculaires pr\u00e9matur\u00e9s correspondant \u00e0 des extrasystoles; les QRS sont fins et identiques aux battements sinusaux: cela permet d\u2019affirmer qu\u2019il ne s\u2019agit pas d\u2019extrasystoles ventriculaires; une analyse attentive de l\u2019onde T en DIII montre une modification l\u00e9g\u00e8re de l\u2019aspect de l\u2019onde T en faveur du diagnostic d\u2019extrasystole atriale;","ecg_info_box":"Une extrasystole atriale pr\u00e9coce peut \u00eatre compl\u00e8tement ou partiellement masqu\u00e9e par l\u2019onde T du complexe qui pr\u00e9c\u00e8de. Une analyse minutieuse de toutes les d\u00e9rivations est parfois n\u00e9cessaire, les modifications de l\u2019amplitude de l\u2019onde T pouvant \u00eatre modestes. Elles peuvent se manifester par un simple crochetage ou une irr\u00e9gularit\u00e9 de l\u2019onde T. Si elles sont non visualis\u00e9es, cela peut conduire \u00e0 un diagnostic erron\u00e9 de dysfonction sinusale (quand l\u2019extrasystole atriale est bloqu\u00e9e) ou d\u2019extrasystole ventriculaire (quand l\u2019extrasystole atriale est suivie d\u2019une aberration de conduction).","commentary_ecg":"Une extrasystole atriale peut survenir comme sur ce trac\u00e9 durant la repolarisation ventriculaire (sur l\u2019onde T suivant le complexe QRS pr\u00e9c\u00e9dent). L\u2019\u00e9lectrocardiogramme de surface enregistre au niveau de la peau, l\u2019int\u00e9gralit\u00e9 des potentiels g\u00e9n\u00e9r\u00e9s par le coeur. En raison d\u2019une masse plus faible, l\u2019amplitude des signaux g\u00e9n\u00e9r\u00e9s par l\u2019oreillette est beaucoup plus faible que celle des signaux g\u00e9n\u00e9r\u00e9s par le ventricule (complexe QRS ou onde T). De surcroit, la pente (\u201cmolle\u201d) de ces 2 signaux (onde P et onde T) est relativement similaire et significativement diff\u00e9rente par rapport \u00e0 celle d\u2019un QRS (pente plus aigu\u00eb). Le diagnostic d\u2019extrasystole atriale peut donc parfois \u00eatre difficile et une analyse minutieuse de toutes les d\u00e9rivations est n\u00e9cessaire. \r\n\r\nUn m\u00e9canisme focal des arythmies atriales a \u00e9t\u00e9 montr\u00e9 dans l\u2019initiation d\u2019un nombre important d\u2019\u00e9pisodes de FA. En effet, le type d\u2019extrasystole atriale observ\u00e9e sur ce trac\u00e9, avec un aspect caract\u00e9ristique P\/T et provenant pour majorit\u00e9 de l\u2019ostium des veines pulmonaires, repr\u00e9sente la g\u00e2chette initiatrice n\u00e9cessaire \u00e0 l\u2019induction d\u2019\u00e9pisodes d\u2019arythmie atriale. L\u2019implication th\u00e9rapeutique est directe car ces extrasystoles sont accessibles \u00e0 un traitement radical par ablation (d\u00e9connexion des veines pulmonaires). Il convient donc d\u2019identifier ce type d\u2019extrasystoles \u201ccach\u00e9es\u201d dans l\u2019onde T et de les diff\u00e9rencier des extrasystoles jonctionnelles qui repr\u00e9sentent le diagnostic diff\u00e9rentiel pour un battement pr\u00e9matur\u00e9 avec QRS fin.","ecg_info_post_answer":"<img class=\"alignnone wp-image-10316 size-large\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/04\/page-211-1024x612.png\" alt=\"\" width=\"800\" height=\"478\" \/>"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trac\u00e9 5.2: Extrasystole atriale - Cardiocases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-5-2-extrasystole-atriale\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trac\u00e9 5.2: Extrasystole atriale - Cardiocases\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-5-2-extrasystole-atriale\/\" \/>\n<meta property=\"og:site_name\" content=\"Cardiocases\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-02T20:23:19+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/\",\"url\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/\",\"name\":\"Trac\u00e9 5.2: Extrasystole atriale - Cardiocases\",\"isPartOf\":{\"@id\":\"https:\/\/cardiocases.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-5-2-ecg-2.jpeg\",\"datePublished\":\"2026-04-02T19:31:35+00:00\",\"dateModified\":\"2026-04-02T20:23:19+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/#primaryimage\",\"url\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-5-2-ecg-2.jpeg\",\"contentUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-5-2-ecg-2.jpeg\",\"width\":1024,\"height\":611},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-5-2-extrasystole-atriale\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cardiocases.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Trac\u00e9 5.2: Extrasystole atriale\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cardiocases.com\/#website\",\"url\":\"https:\/\/cardiocases.com\/\",\"name\":\"Cardiocases\",\"description\":\"Real cardiac device traces, pacemaker &amp; 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