{"id":10095,"date":"2026-04-01T11:43:47","date_gmt":"2026-04-01T11:43:47","guid":{"rendered":"https:\/\/cardiocases.com\/?post_type=ecg_case&#038;p=10095"},"modified":"2026-04-01T11:43:47","modified_gmt":"2026-04-01T11:43:47","slug":"trace-3-4-bloc-de-branche-gauche-frequence-dependant","status":"publish","type":"ecg_case","link":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/","title":{"rendered":"Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant"},"content":{"rendered":"","protected":false},"featured_media":10094,"template":"","ecg_case_type":[252],"language_ecgcase":[259],"class_list":["post-10095","ecg_case","type-ecg_case","status-publish","has-post-thumbnail","hentry","ecg_case_type-bundle-branch-block","language_ecgcase-french"],"acf":{"ecg_case_title":"Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant","patient_description":"Homme de 74 ans pr\u00e9sentant une FA chronique","quiz_question":"Quel(s) est(sont) le(s) diagnostic(s) vrai(s) pour cet ECG?","quiz_answer_1":"rythme sinusal avec extrasystoles","quiz_answer_2":"FA","quiz_answer_3":"flutter atrial","quiz_answer_4":"bloc de branche gauche fr\u00e9quence-d\u00e9pendant","quiz_answer_5":"BAV 3","correct_answer":["B","D"],"ecg_image":10094,"ecg_description":"FA (activit\u00e9 atriale rapide, anarchique) avec alternance entre QRS fins et QRS larges: quand la fr\u00e9quence ventriculaire est relativement lente, aspect de QRS fin; quand la conduction ventriculaire s\u2019am\u00e9liore et quand les ventricules sont plus rapides, aspect de bloc de branche gauche complet fr\u00e9quence-d\u00e9pendant;","ecg_info_box":"Les p\u00e9riodes r\u00e9fractaires des 2 branches peuvent \u00eatre diff\u00e9rentes; un bloc de branche peut donc apparaitre lors d\u2019une tachycardie en pr\u00e9sence de cycles RR courts. ","commentary_ecg":"Ce trac\u00e9 montre un bloc de branche gauche fonctionnel fr\u00e9quence-d\u00e9pendant (qui appara\u00eet au-del\u00e0 d\u2019une fr\u00e9quence cardiaque donn\u00e9e). Cette aberration de conduction apparait quand un influx d\u2019origine supraventriculaire survient alors que la branche gauche est encore en p\u00e9riode r\u00e9fractaire.\r\n\r\nLe bloc fonctionnel dit bloc en phase 3 (phase 3 du potentiel d\u2019action) est donc tachycardie- d\u00e9pendant et rend parfois difficile l\u2019interpr\u00e9tation de l\u2019\u00e9lectrocardiogramme d\u2019une tachycardie (diff\u00e9renciation entre tachycardie ventriculaire et tachycardie supra- ventriculaire avec aberration de conduction).\r\n\r\nQuand l\u2019activit\u00e9 est bloqu\u00e9e dans une des branches (p\u00e9riode r\u00e9fractaire trop longue), il existe sur la branche bloqu\u00e9e une conduction r\u00e9trograde cach\u00e9e qui entretient la probabilit\u00e9 de bloc \u201cfonctionnel\u201d sur le cycle suivant.\r\n\r\n","ecg_info_post_answer":"<img class=\"alignnone wp-image-10307 size-large\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/04\/page-113-1024x679.png\" alt=\"\" width=\"800\" height=\"530\" \/>"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant - 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-3-4-bloc-de-branche-gauche-frequence-dependant\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant - Cardiocases\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/\" \/>\n<meta property=\"og:site_name\" content=\"Cardiocases\" \/>\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-3-4-bloc-de-branche-gauche-frequence-dependant\/\",\"url\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/\",\"name\":\"Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant - Cardiocases\",\"isPartOf\":{\"@id\":\"https:\/\/cardiocases.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-3-4-ecg-4-scaled.jpeg\",\"datePublished\":\"2026-04-01T11:43:47+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/#primaryimage\",\"url\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-3-4-ecg-4-scaled.jpeg\",\"contentUrl\":\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-3-4-ecg-4-scaled.jpeg\",\"width\":2560,\"height\":1740},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cardiocases.com\/ecg_case\/trace-3-4-bloc-de-branche-gauche-frequence-dependant\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cardiocases.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Trac\u00e9 3.4: Bloc de branche gauche fr\u00e9quence-d\u00e9pendant\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cardiocases.com\/#website\",\"url\":\"https:\/\/cardiocases.com\/\",\"name\":\"Cardiocases\",\"description\":\"Real cardiac device traces, pacemaker &amp; 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