{"id":10059,"date":"2026-04-01T08:13:06","date_gmt":"2026-04-01T08:13:06","guid":{"rendered":"https:\/\/cardiocases.com\/?post_type=ecg_case&#038;p=10059"},"modified":"2026-04-08T14:30:42","modified_gmt":"2026-04-08T14:30:42","slug":"trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1","status":"publish","type":"ecg_case","link":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/","title":{"rendered":"Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1"},"content":{"rendered":"","protected":false},"featured_media":10058,"template":"","ecg_case_type":[250],"language_ecgcase":[259],"class_list":["post-10059","ecg_case","type-ecg_case","status-publish","has-post-thumbnail","hentry","ecg_case_type-atrioventricular-block","language_ecgcase-french"],"acf":{"ecg_case_title":"Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1","patient_description":"Homme de 65 ans, hospitalis\u00e9 pour syncope \u00e0 l\u2019emporte pi\u00e8ce","quiz_question":"Quelle(s) est(sont) la(les) r\u00e9ponse(s) vraie(s)?","quiz_answer_1":"l\u2019ECG montre un big\u00e9minisme atrial","quiz_answer_2":"l\u2019ECG montre un BAV type 2\/1","quiz_answer_3":"l\u2019ECG montre un BAV du troisi\u00e8me degr\u00e9","quiz_answer_4":"l\u2019ECG montre un bloc de branche gauche","quiz_answer_5":"l\u2019ECG montre un bloc de branche droit","correct_answer":["B","E"],"ecg_image":10058,"ecg_description":"Activit\u00e9 sinusale r\u00e9guli\u00e8re; 1 onde P sur 2 est bloqu\u00e9e: aspect de BAV du second degr\u00e9 type 2\/1; QRS large avec axe gauche: aspect de bloc de branche droit avec h\u00e9mibloc ant\u00e9rieur gauche;","ecg_info_box":"Dans un bloc 2\/1, une onde P sur 2 est bloqu\u00e9e; ce type de bloc peut correspondre \u00e0 un Mobitz 1 ou \u00e0 un Mobitz 2, la diff\u00e9renciation entre les 2 ayant une importance pronostique importante. ","commentary_ecg":"Le BAV 2\/1 m\u00e9rite d\u2019\u00eatre individualis\u00e9 parce qu\u2019il est relativement fr\u00e9quent et qu\u2019il repr\u00e9sente la limite entre bloc du second degr\u00e9 et bloc de haut grade puisqu\u2019il comporte autant d\u2019ondes P bloqu\u00e9es que d\u2019ondes P conduites. Il est difficile de d\u00e9terminer le si\u00e8ge supra-, intra- ou infra-hisien. L\u2019enregistrement de trac\u00e9s longs peut permettre de r\u00e9v\u00e9ler un aspect de Luciani-Wenckebach typique avec variations de la dur\u00e9e de l\u2019espace PR (en faveur d\u2019un Mobitz 1 nodal) ou un aspect de Mobitz 2 avec plusieurs ondes P conduites suivies d\u2019une onde P bloqu\u00e9e sans modification de l\u2019espace PR (en faveur d\u2019un bloc intra- ou infra-hisien).\r\n\r\nDans un BAV 2\/1, l\u2019intervalle PR des ondes P conduites est habituellement de dur\u00e9e normale mais peut \u00eatre allong\u00e9. On peut observer des variations dans l\u2019espace PP, l\u2019espace PP contenant le QRS \u00e9tant plus court que l\u2019espace PP sans QRS (arythmie sinusale ventriculo-phasique). Diff\u00e9rentes hypoth\u00e8ses ont \u00e9t\u00e9 propos\u00e9es pour expliquer cette alternance dans les cycles atriaux (cycle PP court avec QRS, cycle PP long sans QRS): 1) la d\u00e9polarisation ventriculaire pourrait favoriser un \u00e9tirement de l\u2019oreillette droite responsable d\u2019une augmentation de l\u2019automaticit\u00e9 du n\u0153ud sinusal et une diminution de l\u2019espace PP; 2) la d\u00e9polarisation ventriculaire s\u2019accompagne d\u2019une augmentation du d\u00e9bit cardiaque et d\u2019un effet sur les baror\u00e9cepteurs s\u2019accompagnant d\u2019une baisse de l\u2019activation parasympathique entrainant une augmentation de la fr\u00e9quence sinusale;\r\n\r\nDans un bloc de haut grade, les ondes P non conduites sont plus nombreuses que les ondes P conduites. La conduction atrio-ventriculaire peut se produire \u00e0 intervalles r\u00e9guliers (bloc 3\/1, 4\/1...) ou irr\u00e9guliers. Il est fr\u00e9quent d\u2019observer un \u00e9chappement jonctionnel ou ventriculaire entrainant un aspect de dissociation passager avec quelques rares captures (ondes P conduites).\r\n\r\nChez ce patient symptomatique, l\u2019indication de pose de stimulateur cardiaque ne se discute pas (indication classe I).\r\n\r\n","ecg_info_post_answer":"&nbsp;\r\n\r\n<img class=\"alignnone wp-image-10291 \" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/04\/page-041.png\" alt=\"\" width=\"809\" height=\"510\" \/>"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1 - 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-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1 - Cardiocases\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/\" \/>\n<meta property=\"og:site_name\" content=\"Cardiocases\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-08T14:30:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-1-8-ecg-7-scaled.png\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1510\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/\",\"url\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/\",\"name\":\"Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1 - Cardiocases\",\"isPartOf\":{\"@id\":\"https:\/\/cardiocases.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-1-8-ecg-7-scaled.png\",\"datePublished\":\"2026-04-01T08:13:06+00:00\",\"dateModified\":\"2026-04-08T14:30:42+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/#primaryimage\",\"url\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-1-8-ecg-7-scaled.png\",\"contentUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-1-8-ecg-7-scaled.png\",\"width\":2560,\"height\":1510},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-1-8-bloc-auriculo-ventriculaire-du-second-degre-type-2-1\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cardiocases.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Trac\u00e9 1.8: Bloc auriculo-ventriculaire du second degr\u00e9 type 2\/1\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cardiocases.com\/#website\",\"url\":\"https:\/\/cardiocases.com\/\",\"name\":\"Cardiocases\",\"description\":\"Real cardiac device traces, pacemaker &amp; 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