{"id":556,"date":"2008-11-12T15:21:56","date_gmt":"2008-11-12T15:21:56","guid":{"rendered":"http:\/\/cardiophile.org\/?p=556"},"modified":"2024-01-20T19:04:25","modified_gmt":"2024-01-20T13:34:25","slug":"ecg-quiz-19","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/ecg-quiz-19\/","title":{"rendered":"First Degree AV block"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Do78F5JYL1E?si=Or_3uke_PQJx-A_p\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>\n<h2><span style=\"color: #008000;\">ECG Quiz 19<\/span><\/h2>\n<figure id=\"attachment_38116\" aria-describedby=\"caption-attachment-38116\" style=\"width: 1341px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38116\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2008\/11\/First-degree-AV-block.png\" alt=\"First degree AV block\" width=\"1341\" height=\"675\" \/><figcaption id=\"caption-attachment-38116\" class=\"wp-caption-text\">First degree AV block<\/figcaption><\/figure>\n<p>Normal range of PR interval is 120 to 200 ms. In this case the PR interval is 280 ms, indicating first degree AV block. The P wave is almost encroaching on the T wave of the previous cycle. If the heart rate goes up a bit, the P wave will fall on the T wave of the previous cycle. This will result in atrial contraction occurring during ventricular systole when the AV valves are closed. The forceful atrial contraction against a closed tricuspid valve will produce a cannon wave in the jugular venous pulse. First degree AV block with sinus tachycardia is thus a cause for regular cannon waves. PR interval of 280 ms or above is conventionally considered as a situation in which beta blockers are avoided for fear of worsening AV conduction. Digoxin also can cause worsening of AV conduction in this case.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ECG Quiz 19<\/p>\n","protected":false},"author":1,"featured_media":38116,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecg-electrophysiology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ECG Quiz 19<\/title>\n<meta name=\"description\" content=\"ECG Quiz 19\" \/>\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\/ecg-quiz-19\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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