{"id":23667,"date":"2026-06-03T15:27:58","date_gmt":"2026-06-03T09:57:58","guid":{"rendered":"https:\/\/johnsonfrancis.org\/general\/?p=23667"},"modified":"2026-06-03T15:28:00","modified_gmt":"2026-06-03T09:58:00","slug":"understanding-eps-rfa-the-two-phase-procedure","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/general\/understanding-eps-rfa-the-two-phase-procedure\/","title":{"rendered":"Understanding EPS\/RFA: The Two-Phase Procedure"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/tEAjzPhOj3Q?si=IjICvkjop8TVJ62z\" 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\">An <strong>EPS\/RFA (Electrophysiology Study and Radiofrequency Ablation)<\/strong> is the standard endovascular diagnostic and therapeutic continuum for evaluating and managing complex cardiac arrhythmias.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is a breakdown of the two distinct but seamlessly integrated phases of the procedure:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Diagnostic Phase: Electrophysiology Study (EPS)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The EPS is designed to assess the integrity of the heart&#8217;s electrical conduction system, induce clinical arrhythmias, and map their precise mechanisms and pathways.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Catheter Placement:<\/strong> Multipolar electrode catheters are typically advanced via the femoral veins to standard right-sided cardiac stations: the high right atrium (HRA), the His bundle (HIS), the coronary sinus (CS), and the right ventricular apex\/outflow tract (RVA\/RVOT).<\/li>\n\n\n\n<li class=\"\"><strong>Programmed Electrical Stimulation (PES):<\/strong> Extrastimulus testing and burst pacing are utilized to measure conduction intervals (such as AH and HV intervals), assess refractory periods, and intentionally induce reentrant or focal tachycardias.<\/li>\n\n\n\n<li class=\"\"><strong>Mapping:<\/strong> Using either conventional fluoroscopy or 3D electroanatomical mapping systems (like CARTO or EnSite), the exact origin or critical isthmus of the arrhythmia is localized in real-time.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">The Therapeutic Phase: Radiofrequency Ablation (RFA)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Once the arrhythmogenic substrate is definitively mapped, RFA is employed to eliminate the abnormal tissue.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Mechanism:<\/strong> An ablation catheter delivers medium-frequency alternating current (typically 350\u2013500 kHz). This energy generates resistive heating in the adjacent myocardium, causing localized coagulative necrosis. This effectively creates a targeted, non-conductive scar that permanently disrupts the abnormal circuit.<\/li>\n\n\n\n<li class=\"\"><strong>Endpoints:<\/strong> The procedure concludes with rigorous post-ablation testing\u2014often involving repeated PES or the administration of isoproterenol\u2014to confirm the complete non-inducibility of the arrhythmia or to verify bidirectional block (such as across the cavotricuspid isthmus).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Clinical Indications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>AVNRT &amp; AVRT (e.g., Wolff-Parkinson-White Syndrome):<\/strong> Targeting the slow pathway or accessory pathways.<\/li>\n\n\n\n<li class=\"\"><strong>Atrial Fibrillation (AFib):<\/strong> Achieving pulmonary vein isolation (PVI) to block triggers.<\/li>\n\n\n\n<li class=\"\"><strong>Typical Atrial Flutter:<\/strong> CTI (cavotricuspid isthmus) linear ablation.<\/li>\n\n\n\n<li class=\"\"><strong>Ventricular Tachycardia (VT):<\/strong> Mapping and ablating surviving channels within structural scars or targeting idiopathic outflow tract foci.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>An EPS\/RFA (Electrophysiology Study and Radiofrequency Ablation) is the standard endovascular diagnostic and therapeutic continuum for evaluating and managing complex cardiac arrhythmias. Here is a breakdown of the two distinct but seamlessly integrated phases of the procedure: The Diagnostic Phase: Electrophysiology Study (EPS) The EPS is designed to assess the integrity of the heart&#8217;s electrical [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23668,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-23667","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding EPS\/RFA: The Two-Phase Procedure - All About Heart And Blood Vessels<\/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\/general\/understanding-eps-rfa-the-two-phase-procedure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding EPS\/RFA: The Two-Phase Procedure - All About Heart And Blood Vessels\" \/>\n<meta property=\"og:description\" content=\"An EPS\/RFA (Electrophysiology Study and Radiofrequency Ablation) is the standard endovascular diagnostic and therapeutic continuum for evaluating and managing complex cardiac arrhythmias. 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