{"id":66216,"date":"2026-02-05T06:48:38","date_gmt":"2026-02-05T01:18:38","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=66216"},"modified":"2026-02-05T06:48:41","modified_gmt":"2026-02-05T01:18:41","slug":"cardiopulmonary-bypass-an-overview","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/","title":{"rendered":"Cardiopulmonary Bypass: An Overview"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/hoJX4YAuFhg?si=TYr30WWOP0JERPZZ\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Cardiopulmonary bypass (CPB) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the patient&#8217;s body.<sup><\/sup> Often referred to as the <strong>heart-lung machine<\/strong>, it creates a &#8220;still, bloodless field&#8221; for the surgeon to operate on the heart.<sup><\/sup><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">How the Circuit Works<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The CPB machine functions as an extracorporeal circuit. Blood is diverted away from the heart and pumped through a series of components before being returned to the arterial system.<sup><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Venous Cannulation:<\/strong> Blood is drained by gravity or vacuum from the right atrium or vena cavae.<\/li>\n\n\n\n<li class=\"\"><strong>The Reservoir:<\/strong> Acts as a holding tank for the blood and allows air bubbles to escape.<\/li>\n\n\n\n<li class=\"\"><strong>The Oxygenator (The &#8220;Lungs&#8221;):<\/strong> This is where gas exchange occurs. Oxygen is added to the blood, and carbon dioxide is removed.<\/li>\n\n\n\n<li class=\"\"><strong>Heat Exchanger:<\/strong> Integrated into the oxygenator, it controls the patient&#8217;s body temperature, often inducing <strong>hypothermia<\/strong> to reduce systemic oxygen demand.<\/li>\n\n\n\n<li class=\"\"><strong>The Pump (The &#8220;Heart&#8221;):<\/strong> Usually a roller pump or centrifugal pump that provides the force to propel blood back into the body.<\/li>\n\n\n\n<li class=\"\"><strong>Arterial Filter:<\/strong> A final safety mechanism to catch any micro-emboli or debris before the blood enters the aorta.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Key Physiological Management<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Managing a patient on CPB requires a delicate balance of several factors:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Factor<\/strong><\/td><td><strong>Description<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Anticoagulation<\/strong><\/td><td><strong>Heparin<\/strong> is administered to prevent blood from clotting within the plastic tubing and components. The <strong>Activated Clotting Time (ACT)<\/strong> is monitored to ensure therapeutic levels (usually <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC3329286\/\" type=\"link\" id=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC3329286\/\">>400\u2013480<\/a> seconds).<\/td><\/tr><tr><td><strong>Cardioplegia<\/strong><\/td><td>A potassium-rich solution is infused into the coronary arteries to intentionally stop the heart (asystole), protecting the myocardium during the &#8220;cross-clamp&#8221; period.<\/td><\/tr><tr><td><strong>Hemodilution<\/strong><\/td><td>The circuit is often primed with crystalloid fluids, which reduces blood viscosity and improves microcirculation during hypothermia, though it lowers the hematocrit.<\/td><\/tr><tr><td><strong>Mean Arterial Pressure<\/strong><\/td><td>Typically maintained between <strong>50\u201380 mmHg<\/strong> to ensure adequate perfusion to the brain and kidneys. Upper end is meant for those with chronic hypertension.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Common Complications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">While life-saving, CPB triggers a systemic inflammatory response syndrome (SIRS) because the blood is exposed to non-physiological surfaces.<sup><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Coagulopathy:<\/strong> Destruction of platelets and consumption of clotting factors.<\/li>\n\n\n\n<li class=\"\"><strong>Neurological Deficits:<\/strong> Often called &#8220;pump head,&#8221; or Postperfusion syndrome ranging from mild cognitive impairment to stroke.<\/li>\n\n\n\n<li class=\"\"><strong>Renal Dysfunction:<\/strong> Potential for acute kidney injury due to non-pulsatile flow and inflammatory mediators.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Transitioning a patient off cardiopulmonary bypass (CPB) is one of the most critical phases of cardiac surgery. It is a controlled &#8220;handover&#8221; where the heart and lungs must resume full physiological responsibility after being dormant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Pre-Conditioning Checklist<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before the &#8220;cross-clamp&#8221; is removed and the pump is slowed, the team must ensure the following parameters are met:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Rewarming:<\/strong> The patient\u2019s core temperature is typically brought back to approximately <strong>36.5\u00b0C\u201337\u00b0C<\/strong>.<\/li>\n\n\n\n<li class=\"\"><strong>Metabolic Balance:<\/strong> Electrolytes (especially Potassium and Calcium) and acid-base status must be normalized.<\/li>\n\n\n\n<li class=\"\"><strong>De-airing:<\/strong> The surgeon must meticulously remove any air from the heart chambers and aorta to prevent systemic or coronary air emboli.<\/li>\n\n\n\n<li class=\"\"><strong>Rhythm Restoration:<\/strong> If the heart doesn&#8217;t spontaneously restart in a stable sinus rhythm, internal cardioversion is performed.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Hemodynamic Transition<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The perfusionist slowly &#8220;weans&#8221; the patient by reducing the venous return to the machine, allowing the heart to fill and start pumping blood into the systemic circulation.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Preload Management:<\/strong> As the pump flow decreases, the volume in the heart increases. The anesthesiologist monitors the <strong>Central Venous Pressure (CVP)<\/strong> or <strong>Pulmonary Artery Occlusion Pressure (PAOP)<\/strong>, equivalent to pulmonary capillary wedge pressure and left atrial pressure, to ensure the heart isn&#8217;t overdistended or &#8220;running dry.&#8221;<\/li>\n\n\n\n<li class=\"\"><strong>Contractility Support:<\/strong> Many patients require <strong>inotropic support<\/strong> (e.g., Dobutamine, Milrinone, or Epinephrine) to help the stunned myocardium overcome the systemic vascular resistance.<\/li>\n\n\n\n<li class=\"\"><strong>Afterload Control:<\/strong> If the systemic vascular resistance is too high, the heart may struggle to eject blood, requiring vasodilators.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">The &#8220;Off-Pump&#8221; Moment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Once the heart is maintaining adequate Mean Arterial Pressure (MAP) and Cardiac Output (CO) with minimal pump support, the venous and arterial lines are clamped. This is the moment of truth where the heart is fully &#8220;solo.&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Reversing Anticoagulation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Once the surgical team is confident the patient is stable off-pump, <strong>Protamine Sulfate<\/strong> is administered.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>The Reaction:<\/strong> Protamine neutralizes Heparin to restore normal clotting.<\/li>\n\n\n\n<li class=\"\"><strong>Monitoring:<\/strong> This is a high-risk moment for <strong>Protamine reactions<\/strong> (which can cause severe pulmonary hypertension) and requires close observation of the right heart pressures.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Common Post-Bypass Challenges<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Vasoplegia:<\/strong> A state of low systemic vascular resistance caused by the inflammatory response to the bypass machine, often requiring vasopressors like Norepinephrine.<\/li>\n\n\n\n<li class=\"\"><strong>Right Ventricular (RV) Failure:<\/strong> The RV is particularly sensitive to the changes in pulmonary pressures and volume shifts during weaning.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">During the rewarming and weaning phases of cardiopulmonary bypass (CPB), the myocardium is transitioning from a state of controlled asystole and hypothermia back to active electrical and mechanical function. This period is highly arrhythmogenic due to electrolyte shifts, catecholamine surges, and &#8220;reperfusion injury.&#8221;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Common Rhythms During Rewarming<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As the heart temperature rises, electrical activity returns, often in a predictable but chaotic sequence:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Fine Ventricular Fibrillation (VF):<\/strong> This is common as the cross-clamp is removed and oxygenated blood hits the cold, potassium-laden myocardium. If it doesn&#8217;t spontaneously convert to a perfusing rhythm as the heart warms, internal defibrillation (typically <strong>10\u201320 Joules<\/strong>) is used.<\/li>\n\n\n\n<li class=\"\"><strong>Junctional Tachycardia:<\/strong> Frequently seen in the &#8220;warm-up&#8221; phase. The AV node may recover faster than the SA node, leading to an accelerated junctional rhythm that can compromise cardiac output due to the loss of &#8220;atrial kick.&#8221;<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Post-Bypass Arrhythmias and ECG Challenges<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1. Atrial Fibrillation (POAF)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Post-operative AF is the most common arrhythmia (occurring in 25\u201340% of patients).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Mechanism:<\/strong> Driven by systemic inflammation, oxidative stress, and changes in atrial pressure.<\/li>\n\n\n\n<li class=\"\"><strong>Clinical Pearl:<\/strong> While often transient, it can lead to hemodynamic instability in a freshly weaned heart that is preload-dependent.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. Ventricular Tachycardia (VT) and Localization<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">For patients with underlying ischemia or previous scars, reperfusion can trigger VT.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Localization:<\/strong> If the patient develops PVCs or VT post-weaning, clinicians look for specific morphology. For example, a <strong>Left Bundle Branch Block (LBBB) pattern with an inferior axis<\/strong> often suggests an origin in the <strong>Right Ventricular Outflow Tract (RVOT)<\/strong>, which might be triggered by surgical manipulation or cannulation sites.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. Conduction Blocks<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The proximity of surgical sutures to the conduction system (especially in valve replacements) can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Complete Heart Block (CHB):<\/strong> Often requiring temporary epicardial pacing wires, which are standardly placed before chest closure.<\/li>\n\n\n\n<li class=\"\"><strong>Right Bundle Branch Block (RBBB):<\/strong> Very common after right ventriculotomy or even simple RV distension during the bypass.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. The &#8220;Shark Fin&#8221; and Ischemic Patterns<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">In the immediate post-bypass setting, a &#8220;Shark Fin&#8221; appearance (massive ST-segment elevation) is usually a red flag for <strong>acute graft occlusion<\/strong> or a <strong>coronary air embolus<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Distinction:<\/strong> Unlike the Brugada pattern, this is an evolving injury pattern that requires immediate surgical or interventional attention.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Management Strategies<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Epicardial Pacing:<\/strong> Used to maintain an optimal heart rate (usually 80\u201390 bpm) to optimize cardiac output while the heart is &#8220;stunned.&#8221;<\/li>\n\n\n\n<li class=\"\"><strong>Electrolyte Optimization:<\/strong> Keeping K<sup>+<\/sup> > 4.5 mEq\/L and Mg<sup>2+<\/sup> > 2.0 mg\/dL is the first line of defense against both atrial and ventricular irritability.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Cardiopulmonary bypass (CPB) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the patient&#8217;s body. Often referred to as the heart-lung machine, it creates a &#8220;still, bloodless field&#8221; for the surgeon to operate on the heart. How the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":66218,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-66216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cardiopulmonary Bypass: An Overview - 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\/cardiopulmonary-bypass-an-overview\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cardiopulmonary Bypass: An Overview - All About Cardiovascular System and Disorders\" \/>\n<meta property=\"og:description\" content=\"Cardiopulmonary bypass (CPB) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the patient&#8217;s body. Often referred to as the heart-lung machine, it creates a &#8220;still, bloodless field&#8221; for the surgeon to operate on the heart. How the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-05T01:18:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-05T01:18:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1206\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\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=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"Cardiopulmonary Bypass: An Overview\",\"datePublished\":\"2026-02-05T01:18:38+00:00\",\"dateModified\":\"2026-02-05T01:18:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/\"},\"wordCount\":1156,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Cardiopulmonary-Bypass-An-Overview.jpg\",\"articleSection\":[\"General Cardiology\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/\",\"name\":\"Cardiopulmonary Bypass: An Overview - All About Cardiovascular System and Disorders\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Cardiopulmonary-Bypass-An-Overview.jpg\",\"datePublished\":\"2026-02-05T01:18:38+00:00\",\"dateModified\":\"2026-02-05T01:18:41+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#primaryimage\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Cardiopulmonary-Bypass-An-Overview.jpg\",\"contentUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Cardiopulmonary-Bypass-An-Overview.jpg\",\"width\":1206,\"height\":675},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/cardiopulmonary-bypass-an-overview\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cardiopulmonary Bypass: An Overview\"}]},{\"@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":"Cardiopulmonary Bypass: An Overview - 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\/cardiopulmonary-bypass-an-overview\/","og_locale":"en_US","og_type":"article","og_title":"Cardiopulmonary Bypass: An Overview - All About Cardiovascular System and Disorders","og_description":"Cardiopulmonary bypass (CPB) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the patient&#8217;s body. Often referred to as the heart-lung machine, it creates a &#8220;still, bloodless field&#8221; for the surgeon to operate on the heart. How the [&hellip;]","og_url":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/","og_site_name":"All About Cardiovascular System and Disorders","article_published_time":"2026-02-05T01:18:38+00:00","article_modified_time":"2026-02-05T01:18:41+00:00","og_image":[{"width":1206,"height":675,"url":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg","type":"image\/jpeg"}],"author":"Johnson Francis","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Johnson Francis","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#article","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/"},"author":{"name":"Johnson Francis","@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"headline":"Cardiopulmonary Bypass: An Overview","datePublished":"2026-02-05T01:18:38+00:00","dateModified":"2026-02-05T01:18:41+00:00","mainEntityOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/"},"wordCount":1156,"publisher":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#\/schema\/person\/5441d907049b914770f4bd98fb57feec"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#primaryimage"},"thumbnailUrl":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg","articleSection":["General Cardiology"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/","url":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/","name":"Cardiopulmonary Bypass: An Overview - All About Cardiovascular System and Disorders","isPartOf":{"@id":"https:\/\/johnsonfrancis.org\/professional\/#website"},"primaryImageOfPage":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#primaryimage"},"image":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#primaryimage"},"thumbnailUrl":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg","datePublished":"2026-02-05T01:18:38+00:00","dateModified":"2026-02-05T01:18:41+00:00","breadcrumb":{"@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#primaryimage","url":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg","contentUrl":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/02\/Cardiopulmonary-Bypass-An-Overview.jpg","width":1206,"height":675},{"@type":"BreadcrumbList","@id":"https:\/\/johnsonfrancis.org\/professional\/cardiopulmonary-bypass-an-overview\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/johnsonfrancis.org\/professional\/"},{"@type":"ListItem","position":2,"name":"Cardiopulmonary Bypass: An Overview"}]},{"@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\/66216","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=66216"}],"version-history":[{"count":2,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/66216\/revisions"}],"predecessor-version":[{"id":66219,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/posts\/66216\/revisions\/66219"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/media\/66218"}],"wp:attachment":[{"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/media?parent=66216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/categories?post=66216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/johnsonfrancis.org\/professional\/wp-json\/wp\/v2\/tags?post=66216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}