{"id":66376,"date":"2026-03-06T12:37:33","date_gmt":"2026-03-06T07:07:33","guid":{"rendered":"https:\/\/johnsonfrancis.org\/professional\/?p=66376"},"modified":"2026-03-06T12:37:37","modified_gmt":"2026-03-06T07:07:37","slug":"the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion\/","title":{"rendered":"The &#8220;Great Mimics&#8221; of STEMI on ECG: &#8220;Is it an Occlusion or just an Illusion?&#8221;"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/YhU9fFxV2wE?si=kMew8DSnzblyYci4\" 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\">Imagine that you\u2019re in the ER at 0:05. The monitor alarms. You see ST-segment elevation in the precordial leads. Your first instinct? Activate the cath lab. But wait\u2026  If you call this a STEMI, you might be sending a patient with Pericarditis for an unnecessary procedure\u2014or worse, missing a life-threatening electrolyte imbalance. Today, we are decoding the Great STEMI Mimics. We\u2019re going beyond pattern recognition to true clinical reasoning. <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. The Big Three: Pericarditis vs. BER vs. STEMI<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the most common diagnostic dilemma in the ER.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Acute Pericarditis:<\/strong> * <strong>The Look:<\/strong> Diffuse, concave (&#8220;smiley face&#8221;) ST elevation across almost all leads.<\/li>\n\n\n\n<li class=\"\"><strong>The Clue:<\/strong> <strong>PR-segment depression<\/strong> (especially in Lead II) and PR-elevation in aVR.<\/li>\n\n\n\n<li class=\"\"><strong>The Ratio:<\/strong> In V6, if the ST-segment height is >25% of the T-wave height, it\u2019s more likely pericarditis.<\/li>\n\n\n\n<li class=\"\"><strong>Benign Early Repolarization (BER):<\/strong> * <strong>The Look:<\/strong> High-upward concavity, most prominent in V2\u2013V5.<\/li>\n\n\n\n<li class=\"\"><strong>The Clue:<\/strong> Look for the <strong>&#8220;Fishhook&#8221; (J-notch)<\/strong> at the end of the QRS complex.<\/li>\n\n\n\n<li class=\"\"><strong>Stability:<\/strong> Unlike a STEMI, these patterns don&#8217;t evolve over minutes or hours.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Left Ventricular Hypertrophy (LVH) with &#8220;Strain&#8221;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LVH often creates deep S-waves in V1\u2013V3 and secondary ST elevation, which can look exactly like an Anteroseptal STEMI.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>How to tell:<\/strong> Look for the <strong>Sokolow-Lyon Criteria<\/strong> (S in V1 + R in V5\/V6 > 35 mm).<\/li>\n\n\n\n<li class=\"\"><strong>The Rule of Discordance:<\/strong> In LVH, the ST segment and T-wave should be &#8220;discordant&#8221; (pointing the opposite way) to the main QRS vector. If the QRS is deeply negative, the ST elevation is expected.<\/li>\n\n\n\n<li class=\"\"><strong>The Red Flag:<\/strong> If you see <em>concordant<\/em> ST elevation (QRS and ST segment both pointing up), that\u2019s a real STEMI hiding on top of LVH.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Left Bundle Branch Block (LBBB)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A &#8220;New LBBB&#8221; used to be a STEMI equivalent, but we now know many LBBBs are chronic.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>The Sgarbossa Criteria:<\/strong> This is the &#8220;gold standard&#8221; in this situation.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"\"><strong>Concordant ST elevation \u2265 1 mm<\/strong> in any lead (Highest specificity).<\/li>\n\n\n\n<li class=\"\"><strong>Concordant ST depression \u2265 1 mm<\/strong> in V1, V2, or V3.<\/li>\n\n\n\n<li class=\"\"><strong>Excessive Discordant ST elevation<\/strong> (<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0196064412013686\" type=\"link\" id=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0196064412013686\">Modified Smith-Sgarbossa<\/a>): ST elevation\/S-wave ratio > 0.25. That replaces the <strong>\u2265 5 mm<\/strong> discordant ST elevation <strong>Sgarbossa Criteria<\/strong>.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Hyperkalemia (The &#8220;Great Mimicker&#8221;)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Never forget the metabolic mimics. Potassium shifts can cause &#8220;Pseudoinjury&#8221; patterns.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>The Look:<\/strong> Widened QRS complexes that &#8220;bleed&#8221; into the T-wave, creating a sine-wave appearance or peaked T-waves.<\/li>\n\n\n\n<li class=\"\"><strong>The Danger:<\/strong> If you give thrombolytics to a patient who actually needs calcium gluconate and dialysis, the outcome is disastrous.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Reciprocal Change<\/strong> is the strongest evidence for a STEMI. If you see ST elevation in the Inferior leads (II, III, aVF) <strong>AND<\/strong> ST depression in aVL, it is almost certainly a true MI, not a mimic. ST elevation in aVR and possibly V1 is an exception which can occur in pericarditis along with diffuse ST depression in other leads. That is because these leads are oriented to left ventricular cavity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>Imagine that you\u2019re in the ER at 0:05. The monitor alarms. You see ST-segment elevation in the precordial leads. Your first instinct? Activate the cath lab. But wait\u2026 If you call this a STEMI, you might be sending a patient with Pericarditis for an unnecessary procedure\u2014or worse, missing a life-threatening electrolyte imbalance. Today, we are [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":66377,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-66376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The &quot;Great Mimics&quot; of STEMI on ECG: &quot;Is it an Occlusion or just an Illusion?&quot; - 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\/the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The &quot;Great Mimics&quot; of STEMI on ECG: &quot;Is it an Occlusion or just an Illusion?&quot; - All About Cardiovascular System and Disorders\" \/>\n<meta property=\"og:description\" content=\"Imagine that you\u2019re in the ER at 0:05. The monitor alarms. You see ST-segment elevation in the precordial leads. Your first instinct? Activate the cath lab. But wait\u2026 If you call this a STEMI, you might be sending a patient with Pericarditis for an unnecessary procedure\u2014or worse, missing a life-threatening electrolyte imbalance. Today, we are [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/professional\/the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion\/\" \/>\n<meta property=\"og:site_name\" content=\"All About Cardiovascular System and Disorders\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-06T07:07:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-06T07:07:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/03\/The-Great-Mimics-of-STEMI-on-ECG-Is-it-an-Occlusion-or-just-an-Illusion.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/the-great-mimics-of-stemi-on-ecg-is-it-an-occlusion-or-just-an-illusion\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/professional\\\/#\\\/schema\\\/person\\\/5441d907049b914770f4bd98fb57feec\"},\"headline\":\"The &#8220;Great Mimics&#8221; 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