{"id":6480,"date":"2018-01-13T20:03:14","date_gmt":"2018-01-13T14:33:14","guid":{"rendered":"http:\/\/cardiophile.org\/?p=6480"},"modified":"2022-11-26T20:14:23","modified_gmt":"2022-11-26T14:44:23","slug":"right-bundle-branch-block","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/right-bundle-branch-block\/","title":{"rendered":"Right bundle branch block"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/-JDEuuSdN6U\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"><\/iframe><\/p>\n<h2 style=\"text-align: left;\"><span style=\"color: #008000;\">Right bundle branch block<\/span><\/h2>\n<figure style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2011\/07\/rbbb-small1.jpg\" alt=\"Right bundle branch block\" width=\"500\" height=\"172\"><figcaption class=\"wp-caption-text\"><em><strong><span style=\"color: #0000ff;\">Right bundle branch block<\/span><\/strong><\/em><\/figcaption><\/figure>\n<p>Right bundle branch block (RBBB) is characterised by an RSR\u2019 pattern with the R\u2019 being slurred, in V1, producing a QRS duration of 120 msec or more. This delayed right ventricular activation is reflected as a delayed and slurred S wave in leads oriented to the left ventricle, viz. lead I, aVL, V5 and V6. The same pattern if it occurs with a QRS duration of less than 120 msec, it is generally designated as incomplete right bundle branch block (IRBBB). Mild ST segment depression and inverted T waves in anterior leads are associated with RBBB.<\/p>\n<p>Unlike left bundle branch block which often co-exists with structural heart disease, RBBB can occur in the absence of structural heart disease. In a large study involving over sixty seven thousand asymptomatic individuals [1], the incidence of RBBB was found to be 0.15% in the age group of 20 to 30 years and 0.29% in those above 40 years .<\/p>\n<p>RBBB may complicate acute myocardial infarction of the anterior wall, in which case it has prognostic significance, usually indicative of more extensive myocardial infarction and possibility of left ventricular dysfunction. IRBBB pattern can occur in atrial septal defect, Ebstein\u2019s anomaly of tricuspid valve and acute pulmonary embolism.<\/p>\n<p><strong><span style=\"color: #0000ff;\">Reference<\/span><\/strong><\/p>\n<ol>\n<li>Johnson RL, Averill KH, Lamb LE. <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/14407509\">Electrocardiographic findings in 67,375 asymptomatic subjects. VI. Right bundle branch block<\/a>.&nbsp;Am J Cardiol. 1960 Jul;6:143-52.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>ECG showing right bundle branch block. Right bundle branch block is characterised by an RSR\u2019 pattern with the R\u2019 being slurred, producing a QRS duration of 120 msec or more.<\/p>\n","protected":false},"author":1,"featured_media":8466,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6,7],"tags":[],"class_list":["post-6480","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecg-electrophysiology","category-ecg-library"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ECG showing right bundle branch block - RSR&#039; pattern<\/title>\n<meta name=\"description\" content=\"Right bundle branch block is characterised by an RSR\u2019 pattern with the R\u2019 being slurred, producing a QRS duration of 120 msec or more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/professional\/right-bundle-branch-block\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ECG showing right bundle branch block - 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