{"id":10867,"date":"2026-06-29T12:22:55","date_gmt":"2026-06-29T12:22:55","guid":{"rendered":"https:\/\/cardiocases.com\/?post_type=ecg_case&#038;p=10867"},"modified":"2026-07-01T19:21:15","modified_gmt":"2026-07-01T19:21:15","slug":"trace-6-12-atrial-flutter-and-post-cardioversion-syncope","status":"publish","type":"ecg_case","link":"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\/","title":{"rendered":"Trace 6.12: Atrial flutter and post-cardioversion syncope"},"content":{"rendered":"","protected":false},"featured_media":9754,"template":"","ecg_case_type":[255],"language_ecgcase":[258],"class_list":["post-10867","ecg_case","type-ecg_case","status-publish","has-post-thumbnail","hentry","ecg_case_type-atrial-fibrillation-atrial-flutter-atrial-tachycardia","language_ecgcase-english"],"acf":{"ecg_case_title":"Trace 6.12: Atrial flutter and post-cardioversion syncope","patient_description":"87-year-old man with ischemic cardiomyopathy and left bundle branch block; hospitalization for repeated syncope; recording of a long tracing (lead II over 1 minute); the patient presented a near-syncope during the recording of the tracing;","quiz_question":"Which answer(s) is(are) true regarding the diagnosis(es) on this ECG? We can observe:","quiz_answer_1":"atrial flutter","quiz_answer_2":"ventricular tachycardia","quiz_answer_3":"atrial extrasystoles","quiz_answer_4":"post tachycardia-termination pause","quiz_answer_5":"paroxysmal complete atrioventricular block","correct_answer":["A","C","D"],"ecg_image":9754,"ecg_description":"This extended lead II recording allows highlighting a number of elements: 1) initially, there is a probable atrial flutter (sawtooth pattern) with variable conduction and left bundle branch block; 2) the atrial flutter is reduced with the presence of a post-tachycardia sinus pause of 5 seconds; 3) presence of premature atrial extrasystoles with P-on-T pattern; 4) new onset of the atrial arrhythmia;","ecg_info_box":"The combination of atrial flutter and post-tachycardia sinus pause is a particular form of atrial disease.","commentary_ecg":"In this patient, two main hypotheses could initially be evoked to explain the occurrence of sudden syncope: 1) a paroxysmal complete atrioventricular block suggested by the presence of the left bundle branch block; 2) a common ventricular rhythm disorder in patients with ischemic cardiomyopathy. The recorded tracing reveals a third mechanism: a post-tachycardia sinus pause. This type of tracing therefore corresponds to a variant of atrial disease combining atrial fibrillation\/flutter episodes and significant pause occurring only at the time of the end of the arrhythmia. This patient underwent a common flutter ablation, a relatively standardized procedure with a success rate exceeding 90%, which eliminated the syncopal episodes.","ecg_info_post_answer":"<img class=\"alignnone wp-image-10892 size-large\" src=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/06\/trace-6-12-ecg-en-1024x576.jpg\" alt=\"\" width=\"800\" height=\"450\" \/>"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trace 6.12: Atrial flutter and post-cardioversion syncope - 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-6-12-atrial-flutter-and-post-cardioversion-syncope\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trace 6.12: Atrial flutter and post-cardioversion syncope - Cardiocases\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cardiocases.com\/fr\/ecg_case\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\/\" \/>\n<meta property=\"og:site_name\" content=\"Cardiocases\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-01T19:21:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cardiocases.com\/wp-content\/uploads\/2026\/03\/trace-6-12-ecg-scaled-e1782933667553-1024x686.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"686\" \/>\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-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/\",\"name\":\"Trace 6.12: Atrial flutter and post-cardioversion syncope - Cardiocases\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-6-12-ecg-scaled-e1782933667553.png\",\"datePublished\":\"2026-06-29T12:22:55+00:00\",\"dateModified\":\"2026-07-01T19:21:15+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/#primaryimage\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-6-12-ecg-scaled-e1782933667553.png\",\"contentUrl\":\"https:\\\/\\\/cardiocases.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/trace-6-12-ecg-scaled-e1782933667553.png\",\"width\":2560,\"height\":1715},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/ecg_case\\\/trace-6-12-atrial-flutter-and-post-cardioversion-syncope\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/cardiocases.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Trace 6.12: Atrial flutter and post-cardioversion syncope\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/cardiocases.com\\\/#website\",\"url\":\"https:\\\/\\\/cardiocases.com\\\/\",\"name\":\"Cardiocases\",\"description\":\"Real cardiac device traces, pacemaker &amp; 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