{"id":66835,"date":"2026-05-01T20:59:12","date_gmt":"2026-05-01T15:29:12","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=66835"},"modified":"2026-05-01T20:59:14","modified_gmt":"2026-05-01T15:29:14","slug":"functional-mitral-regurgitation-assessment-and-management","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/functional-mitral-regurgitation-assessment-and-management\/","title":{"rendered":"Functional Mitral Regurgitation: Assessment and Management"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/jMHr9QTeoUs?si=E0GAbJamuZycmUPS\" 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<p class=\"wp-block-paragraph\">Functional Mitral Regurgitation (FMR), or secondary MR, represents a complex interplay where the mitral valve is a &#8220;physiologic bystander&#8221; to underlying left ventricular (LV) or atrial pathology. Unlike primary MR, the leaflets and chordae are typically morphologically normal; the regurgitation arises from geometric changes that prevent proper coaptation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pathophysiology and Classification<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FMR is most commonly classified using the <strong><a href=\"https:\/\/johnsonfrancis.org\/professional\/modified-carpentier-functional-classification-of-mitral-valve-disease\/\" type=\"link\" id=\"https:\/\/johnsonfrancis.org\/professional\/modified-carpentier-functional-classification-of-mitral-valve-disease\/\">Carpentier system<\/a><\/strong> as <strong>Type IIIb<\/strong> (restricted motion during systole) or <strong>Type I<\/strong> (annular dilation).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Ventricular FMR:<\/strong> LV remodeling\u2014often from ischemic heart disease or dilated cardiomyopathy\u2014leads to papillary muscle displacement. This results in apical and lateral <strong>tethering<\/strong> of the leaflets, increased tenting height, and tenting area.<\/li>\n\n\n\n<li class=\"\"><strong>Atrial FMR:<\/strong> Increasingly recognized in patients with chronic atrial fibrillation. Massive annular dilation and impaired annular dynamics prevent the leaflets from meeting, even in the absence of significant LV dysfunction.<\/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 Assessment Dilemma: EROA Thresholds<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most debated aspects of FMR was the threshold for &#8220;severity.&#8221; The discrepancy between guidelines historically centered on the <strong>Effective Regurgitant Orifice Area (EROA)<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>One set:<\/strong> Generally utilizes a threshold of \u2265 0.4 cm<sup>2<\/sup> for severe MR (harmonized with primary MR).<\/li>\n\n\n\n<li class=\"\"><strong>Other set:<\/strong> Previously utilized\u2265 0.2 cm<sup>2<\/sup> as severe, arguing that lower volumes carry higher prognostic risk in heart failure patients.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Proportionate vs. Disproportionate FMR<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/30553663\/\" type=\"link\" id=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/30553663\/\">Grayburn-Packer model<\/a><\/strong> helps explain why some patients respond to transcatheter intervention while others do not:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Proportionate FMR:<\/strong> The degree of MR is expected for the degree of LV dilation. These patients rarely benefit from edge-to-edge repair (TEER) as the primary problem is the ventricle.<\/li>\n\n\n\n<li class=\"\"><strong>Disproportionate FMR:<\/strong> The MR is &#8220;excessive&#8221; relative to the LV end-diastolic volume (LVEDV). These patients (similar to the <strong>COAPT<\/strong> trial population) show significant mortality benefits from TEER.<\/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<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Strategy<\/strong><\/td><td><strong>Clinical Context<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>GDMT<\/strong><\/td><td>The cornerstone. ACEi\/ARBs\/ARNI, Beta-blockers, MRAs, and SGLT2 inhibitors can promote reverse remodeling and reduce FMR.<\/td><\/tr><tr><td><strong>CRT<\/strong><\/td><td>In patients with LBBB and wide QRS, Cardiac Resynchronization Therapy can improve papillary muscle coordination and reduce MR acutely.<\/td><\/tr><tr><td><strong>TEER (MitraClip)<\/strong><\/td><td>Indicated for symptomatic patients on optimal GDMT with &#8220;disproportionate&#8221; MR (EROA \u2265 0.3  cm<sup>2<\/sup> and LVEDV &lt; 70 ml\/m<sup>2<\/sup>).<\/td><\/tr><tr><td><strong>Surgery<\/strong><\/td><td>Generally reserved for patients undergoing CABG\/AVR. Isolated mitral surgery for FMR (undersized annuloplasty or replacement) has high recurrence rates and no proven survival benefit over medical therapy alone.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Indicators on Echocardiography<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating for potential intervention, specific geometric measurements are critical:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Tenting Height:<\/strong> The distance between the mitral annular plane and the coaptation point. A <strong>tenting height > 10 mm<\/strong> is a technical indicator of severe restriction and is associated with a high risk of annuloplasty failure.<\/li>\n\n\n\n<li class=\"\"><strong>Tenting Area:<\/strong> The area enclosed by the leaflets and the annular plane in the apical four-chamber view. A <strong>tenting area > 2.5 cm\u00b2<\/strong> suggests significant leaflet tethering.<\/li>\n\n\n\n<li class=\"\"><strong><a href=\"https:\/\/www.ahajournals.org\/doi\/10.1161\/CIRCULATIONAHA.106.649236\" type=\"link\" id=\"https:\/\/www.ahajournals.org\/doi\/10.1161\/CIRCULATIONAHA.106.649236\">Posterior Leaflet Angle (PLA)<\/a>:<\/strong> The angle between the posterior leaflet and the annular plane. A <strong>PLA > 45\u00b0<\/strong> is a strong predictor of recurrent MR after surgical ring annuloplasty.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Functional Mitral Regurgitation (FMR), or secondary MR, represents a complex interplay where the mitral valve is a &#8220;physiologic bystander&#8221; to underlying left ventricular (LV) or atrial pathology. Unlike primary MR, the leaflets and chordae are typically morphologically normal; the regurgitation arises from geometric changes that prevent proper coaptation. Pathophysiology and Classification FMR is most commonly [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":66838,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-66835","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>Functional Mitral Regurgitation: Assessment and Management - 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\/functional-mitral-regurgitation-assessment-and-management\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Functional Mitral Regurgitation: Assessment and Management - All About Cardiovascular System and Disorders\" \/>\n<meta property=\"og:description\" content=\"Functional Mitral Regurgitation (FMR), or secondary MR, represents a complex interplay where the mitral valve is a &#8220;physiologic bystander&#8221; to underlying left ventricular (LV) or atrial pathology. 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