{"id":140,"date":"2008-09-21T05:01:23","date_gmt":"2008-09-21T11:01:23","guid":{"rendered":"http:\/\/md.cardiophile.com\/?p=98"},"modified":"2008-09-21T05:01:23","modified_gmt":"2008-09-21T11:01:23","slug":"what-are-the-phases-of-ventricular-fibrillation-vf","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/what-are-the-phases-of-ventricular-fibrillation-vf\/","title":{"rendered":"What are the phases of ventricular fibrillation (VF)?"},"content":{"rendered":"<h2 class=\"MsoNormal\" style=\"margin: 0cm 0cm 10pt;\"><span style=\"color: #008000;\"><strong>Phases of ventricular fibrillation (VF)<\/strong><\/span><\/h2>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/VFoLXDGFmto\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"><\/iframe><br \/>\nHere is what has been called as the three phase model of ventricular fibrillation:<\/p>\n<ol>\n<li><strong><span style=\"color: #0000ff;\">Electrical phase:<\/span> <\/strong>Initial 4 minutes of VF.<\/li>\n<li><strong><span style=\"color: #0000ff;\">Hemodynamic phase:<\/span><\/strong> 4 minutes to 10 minutes after the onset of VF.<\/li>\n<li><strong><span style=\"color: #0000ff;\">Metabolic phase:<\/span><\/strong> Beyond 10 minutes after the onset of VF.<\/li>\n<\/ol>\n<p>If EMS (Emergency medical service) arrives within 4 min (electrical phase) \u2013 defibrillation first \u2013 It is likely to be coarse VF and responds better to defibrillation. Moreover, metabolic acidosis which makes ventricular fibrillation refractory to defibrillation, would not have set in.<br \/>\nIf after 4 min, but before 10 min, cardiopulmonary resuscitation (CPR) followed by defibrillation. It is likely that by this time lack of circulation would have caused metabolic acidosis and ventricular fibrillation would have degenerated into fine ventricular fibrillation. Defibrillation first strategy may have limited success at this stage and hence CPR first strategy is adopted. CPR will get the circulation started and there will be improvement in metabolic acidosis. This will enhance the chances of successful defibrillation.<br \/>\nIf EMS arrives beyond 10 min, only limited success can be anticipated. CPR followed by defibrillation may achieve return of spontaneous circulation (ROSC) in some cases. Induction of hypothermia (revised term: <em>targeted temperature management<\/em>) is recommended as a measure of cerebral protection, though trial results have been controversial.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Phases of ventricular fibrillation (VF)<br \/>\nHere is what has been called as the three phase model of ventricular fibrillation:<br \/>\nElectrical phase: Initial 4 minutes of VF.<br \/>\nHemodynamic phase: 4 minutes to 10 minutes after the onset of VF.<br \/>\nMetabolic phase: Beyond 10 minutes after the onset of VF.<\/p>\n","protected":false},"author":1,"featured_media":22609,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-140","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 v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Phases of ventricular fibrillation - Electrical, hemodynamic and metabolic<\/title>\n<meta name=\"description\" content=\"Phases of ventricular fibrillation (VF) Here is what has been called as the three phase model of ventricular fibrillation: Electrical phase: Initial 4 minutes of VF. Hemodynamic phase: 4 minutes to 10 minutes after the onset of VF. Metabolic phase: Beyond 10 minutes after the onset of VF.\" \/>\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\/what-are-the-phases-of-ventricular-fibrillation-vf\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Phases of ventricular fibrillation - Electrical, hemodynamic and metabolic\" \/>\n<meta property=\"og:description\" content=\"Phases of ventricular fibrillation (VF) Here is what has been called as the three phase model of ventricular fibrillation: Electrical phase: Initial 4 minutes of VF. Hemodynamic phase: 4 minutes to 10 minutes after the onset of VF. Metabolic phase: Beyond 10 minutes after the onset of VF.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/what-are-the-phases-of-ventricular-fibrillation-vf\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2008-09-21T11:01:23+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\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"What are the phases of ventricular fibrillation (VF)?\",\"datePublished\":\"2008-09-21T11:01:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/\"},\"wordCount\":214,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"articleSection\":[\"ECG \\\/ Electrophysiology\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/\",\"name\":\"Phases of ventricular fibrillation - Electrical, hemodynamic and metabolic\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/what-are-the-phases-of-ventricular-fibrillation-vf\\\/#primaryimage\"},\"thumbnailUrl\":\"\",\"datePublished\":\"2008-09-21T11:01:23+00:00\",\"description\":\"Phases of ventricular fibrillation (VF) Here is what has been called as the three phase model of ventricular fibrillation: Electrical phase: Initial 4 minutes of VF. 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