{"id":47848,"date":"2021-08-25T15:36:14","date_gmt":"2021-08-25T10:06:14","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=47848"},"modified":"2021-08-25T15:36:14","modified_gmt":"2021-08-25T10:06:14","slug":"features-of-wenckebach-phenomenon","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/","title":{"rendered":"Features of Wenckebach Phenomenon"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/IyDPMSvyLYg\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"><\/iframe><\/p>\n<h2><span style=\"color: #008000;\">Features of Wenckebach Phenomenon<\/span><\/h2>\n<p>Progressive prolongation of PR interval followed by missing of a QRS complex is the classical manifestation of Wenckebach Phenomenon or Wenckebach AV block.<\/p>\n<figure id=\"attachment_47851\" aria-describedby=\"caption-attachment-47851\" style=\"width: 779px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-47851\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2021\/08\/Features-of-Wenckebach-Phenomenon.png\" alt=\"Features of Wenckebach Phenomenon\" width=\"779\" height=\"324\"><figcaption id=\"caption-attachment-47851\" class=\"wp-caption-text\">Features of Wenckebach Phenomenon<\/figcaption><\/figure>\n<p>The increments in PR interval in each successive beat is decremental. This produces progressive shortening of RR intervals.<\/p>\n<figure id=\"attachment_47852\" aria-describedby=\"caption-attachment-47852\" style=\"width: 952px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-47852\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2021\/08\/Features-of-Wenckebach-Phenomenon-Shortening-of-RR-Interval.png\" alt=\"Features of Wenckebach Phenomenon - Shortening of RR Interval\" width=\"952\" height=\"320\"><figcaption id=\"caption-attachment-47852\" class=\"wp-caption-text\">Features of Wenckebach Phenomenon &#8211; Shortening of RR Interval<\/figcaption><\/figure>\n<p>The shortest RR interval is in the beat preceding the pause. The longest RR interval is less than twice the shortest RR interval.<\/p>\n<figure id=\"attachment_47853\" aria-describedby=\"caption-attachment-47853\" style=\"width: 753px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-47853\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2021\/08\/Features-of-Wenckebach-Phenomenon-Shortest-and-Longest-RR-Intervl.png\" alt=\"Features of Wenckebach Phenomenon - Shortest and Longest RR Interval\" width=\"753\" height=\"322\"><figcaption id=\"caption-attachment-47853\" class=\"wp-caption-text\">Features of Wenckebach Phenomenon &#8211; Shortest and Longest RR Interval<\/figcaption><\/figure>\n<p>Highest grade of Wenckebach AV block possible is 2:1 AV block. In 2:1 AV block, 50% of the P waves are non-conducted, while in the other grades, higher percentages are conducted. But in 2:1 AV block one cannot be sure of the Wenckebach nature of the AV block because there is no progressive prolongation of PR interval.<\/p>\n<p>In Wenckebach AV block, in each cycle, the number of QRS complexes will be just one less than the number of P waves. Hence the conduction ratio in Wenckebach AV block will be 3:2, 4:3, 5:4 etc. By the same analogy, there is progressive shortening of PP interval followed by missing of a P wave in Wenckebach sinoatrial block. The longest PP interval is less than twice the shortest PP interval.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Features of Wenckebach Phenomenon Progressive prolongation of PR interval followed by missing of a QRS complex is the classical manifestation of Wenckebach Phenomenon or Wenckebach AV block. The increments in PR interval in each successive beat is decremental. This produces progressive shortening of RR intervals. The shortest RR interval is in the beat preceding the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":47855,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-47848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cardiology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders<\/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:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders\" \/>\n<meta property=\"og:description\" content=\"Features of Wenckebach Phenomenon Progressive prolongation of PR interval followed by missing of a QRS complex is the classical manifestation of Wenckebach Phenomenon or Wenckebach AV block. The increments in PR interval in each successive beat is decremental. This produces progressive shortening of RR intervals. The shortest RR interval is in the beat preceding the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2021-08-25T10:06:14+00:00\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"Features of Wenckebach Phenomenon\",\"datePublished\":\"2021-08-25T10:06:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/\"},\"wordCount\":237,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"articleSection\":[\"Cardiology\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/\",\"name\":\"Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"datePublished\":\"2021-08-25T10:06:14+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#primaryimage\",\"url\":\"\",\"contentUrl\":\"\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/features-of-wenckebach-phenomenon\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Features of Wenckebach Phenomenon\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#website\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/\",\"name\":\"All About Cardiovascular System and Disorders\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\",\"name\":\"Johnson Francis\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g\",\"caption\":\"Johnson Francis\"},\"logo\":{\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g\"},\"description\":\"Former Professor of Cardiology, Calicut Govt. Medical Kozhikode, Kerala, India. Editor-in-Chief, BMH Medical Journal\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/author\\\/jf\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/","og_locale":"en_US","og_type":"article","og_title":"Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders","og_description":"Features of Wenckebach Phenomenon Progressive prolongation of PR interval followed by missing of a QRS complex is the classical manifestation of Wenckebach Phenomenon or Wenckebach AV block. The increments in PR interval in each successive beat is decremental. This produces progressive shortening of RR intervals. The shortest RR interval is in the beat preceding the [&hellip;]","og_url":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/","og_site_name":"All About Cardiovascular System and Disorders","article_published_time":"2021-08-25T10:06:14+00:00","author":"Johnson Francis","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Johnson Francis","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#article","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/"},"author":{"name":"Johnson Francis","@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"headline":"Features of Wenckebach Phenomenon","datePublished":"2021-08-25T10:06:14+00:00","mainEntityOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/"},"wordCount":237,"publisher":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#primaryimage"},"thumbnailUrl":"","articleSection":["Cardiology"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/","url":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/","name":"Features of Wenckebach Phenomenon - All About Cardiovascular System and Disorders","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#website"},"primaryImageOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#primaryimage"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#primaryimage"},"thumbnailUrl":"","datePublished":"2021-08-25T10:06:14+00:00","breadcrumb":{"@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#primaryimage","url":"","contentUrl":""},{"@type":"BreadcrumbList","@id":"https:\/\/johnsonfrancis.org\/professional\/features-of-wenckebach-phenomenon\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/johnsonfrancis.org\/professional\/"},{"@type":"ListItem","position":2,"name":"Features of Wenckebach Phenomenon"}]},{"@type":"WebSite","@id":"https:\/\/johnsonfrancis.org\/professional\/#website","url":"https:\/\/johnsonfrancis.org\/professional\/","name":"All About Cardiovascular System and Disorders","description":"","publisher":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/johnsonfrancis.org\/professional\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":["Person","Organization"],"@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec","name":"Johnson Francis","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g","caption":"Johnson Francis"},"logo":{"@id":"https:\/\/secure.gravatar.com\/avatar\/80861b82c3f559be9e413245c5643b6c483c93495507facfe32cf96ccd8bcffd?s=96&d=mm&r=g"},"description":"Former Professor of Cardiology, Calicut Govt. Medical Kozhikode, Kerala, India. Editor-in-Chief, BMH Medical Journal","url":"https:\/\/johnsonfrancis.org\/professional\/author\/jf\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/47848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/comments?post=47848"}],"version-history":[{"count":0,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/47848\/revisions"}],"wp:attachment":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/media?parent=47848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/categories?post=47848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/tags?post=47848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}