{"id":20911,"date":"2015-12-06T07:12:53","date_gmt":"2015-12-06T01:42:53","guid":{"rendered":"https:\/\/cardiophile.org\/?p=20911"},"modified":"2022-12-14T20:28:27","modified_gmt":"2022-12-14T14:58:27","slug":"waves-in-an-electrocardiogram","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/","title":{"rendered":"Waves in an Electrocardiogram"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/V_gfM3mRvMU\" 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;\">Waves in an Electrocardiogram<\/span><\/h2>\n<p>The usual waves in an ECG are P, QRS and T waves. P waves represent depolarization of the atria. QRS represents the depolarization of the ventricles. T wave is due to ventricular repolarization.<\/p>\n<p>The repolarization wave of the atria is not usually visible on the surface electrocardiogram. If present, it is known as the Ta wave. The extent of Ta wave includes the PR segment, QRS and early part of the ST segment. Prominent Ta wave contributes to the upsloping ST depression sometimes seen during treadmill exercise test.<\/p>\n<p>In addition to these certain waves occur in abnormal situations. A delta wave appears in pre-excitation while an epsilon wave appears in post excitation. Delta wave is a slurring of the initial portion of the QRS which resembles the Greek alphabet delta. Epsilon wave occurs at the end of the QRS and is seen in arrhythmogenic right ventricular dysplasia.<\/p>\n<p>An Osborn wave is visible at the end of the QRS in severe hypothermia. A normal variant known as J wave is also sometimes seen at the end of the QRS. A U wave may be seen after the T wave in certain cases, especially when there is bradycardia. U wave becomes more prominent in hypokalemia.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Waves in an Electrocardiogram The usual waves in an ECG are P, QRS and T waves. P waves represent depolarization of the atria. QRS represents the depolarization of the ventricles. T wave is due to ventricular repolarization. The repolarization wave of the atria is not usually visible on the surface electrocardiogram. If present, it is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":40017,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-20911","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 v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Waves in an Electrocardiogram: P, QRS and T waves<\/title>\n<meta name=\"description\" content=\"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.\" \/>\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\/waves-in-an-electrocardiogram\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Waves in an Electrocardiogram: P, QRS and T waves\" \/>\n<meta property=\"og:description\" content=\"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2015-12-06T01:42:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-12-14T14:58:27+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\\\/waves-in-an-electrocardiogram\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"Waves in an Electrocardiogram\",\"datePublished\":\"2015-12-06T01:42:53+00:00\",\"dateModified\":\"2022-12-14T14:58:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/\"},\"wordCount\":211,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"articleSection\":[\"ECG \\\/ Electrophysiology\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/\",\"name\":\"Waves in an Electrocardiogram: P, QRS and T waves\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"datePublished\":\"2015-12-06T01:42:53+00:00\",\"dateModified\":\"2022-12-14T14:58:27+00:00\",\"description\":\"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#primaryimage\",\"url\":\"\",\"contentUrl\":\"\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/waves-in-an-electrocardiogram\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Waves in an Electrocardiogram\"}]},{\"@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":"Waves in an Electrocardiogram: P, QRS and T waves","description":"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.","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\/waves-in-an-electrocardiogram\/","og_locale":"en_US","og_type":"article","og_title":"Waves in an Electrocardiogram: P, QRS and T waves","og_description":"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.","og_url":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/","og_site_name":"All About Cardiovascular System and Disorders","article_published_time":"2015-12-06T01:42:53+00:00","article_modified_time":"2022-12-14T14:58:27+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\/waves-in-an-electrocardiogram\/#article","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/"},"author":{"name":"Johnson Francis","@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"headline":"Waves in an Electrocardiogram","datePublished":"2015-12-06T01:42:53+00:00","dateModified":"2022-12-14T14:58:27+00:00","mainEntityOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/"},"wordCount":211,"publisher":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#primaryimage"},"thumbnailUrl":"","articleSection":["ECG \/ Electrophysiology"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/","url":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/","name":"Waves in an Electrocardiogram: P, QRS and T waves","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#website"},"primaryImageOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#primaryimage"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#primaryimage"},"thumbnailUrl":"","datePublished":"2015-12-06T01:42:53+00:00","dateModified":"2022-12-14T14:58:27+00:00","description":"Waves in an Electrocardiogram: The usual waves in an electrocardiogram are P, QRS and T waves. P waves represents repolarization of the atria.","breadcrumb":{"@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#primaryimage","url":"","contentUrl":""},{"@type":"BreadcrumbList","@id":"https:\/\/johnsonfrancis.org\/professional\/waves-in-an-electrocardiogram\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/johnsonfrancis.org\/professional\/"},{"@type":"ListItem","position":2,"name":"Waves in an Electrocardiogram"}]},{"@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\/20911","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=20911"}],"version-history":[{"count":5,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/20911\/revisions"}],"predecessor-version":[{"id":57521,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/20911\/revisions\/57521"}],"wp:attachment":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/media?parent=20911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/categories?post=20911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/tags?post=20911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}