{"id":23225,"date":"2026-02-24T17:25:04","date_gmt":"2026-02-24T11:55:04","guid":{"rendered":"https:\/\/johnsonfrancis.org\/general\/?p=23225"},"modified":"2026-03-14T04:40:05","modified_gmt":"2026-03-13T23:10:05","slug":"ecg-changes-in-non-cardiac-conditions","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/general\/ecg-changes-in-non-cardiac-conditions\/","title":{"rendered":"ECG Changes in Non-Cardiac Conditions"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Wy_rBWcZ3GU?si=Lqtm2FQZfY-gzu-u\" 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\">It is a common clinical pitfall to assume every ST-segment elevation or T-wave inversion points to a primary coronary event. In reality, the heart is often an &#8220;innocent bystander&#8221; reflecting systemic derangements. Here is a breakdown of significant ECG changes seen in non-cardiac conditions:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Electrolyte Imbalances<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Electrolytes govern the action potential; when they shift, the surface ECG reflects it immediately.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Condition<\/strong><\/td><td><strong>Classic ECG Findings<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Hyperkalemia<\/strong><\/td><td>Peaked T-waves (narrow\/tented), PR prolongation, loss of P-wave, widened QRS (&#8220;sine wave&#8221; in extremes).<\/td><\/tr><tr><td><strong>Hypokalemia<\/strong><\/td><td>Flattened T-waves, prominent <strong>U-waves<\/strong>, ST-depression, prolonged QU interval.<\/td><\/tr><tr><td><strong>Hypercalcemia<\/strong><\/td><td>Shortened QT interval (the ST segment practically disappears).<\/td><\/tr><tr><td><strong>Hypocalcemia<\/strong><\/td><td>Prolonged QT interval (primarily via ST-segment lengthening)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Neurological Events (The &#8220;Cerebral T-Wave&#8221;)<\/h2>\n\n\n\n<p id=\"p-rc_19d8ea013773b30e-19\" class=\"wp-block-paragraph\">Acute intracranial insults\u2014particularly <strong>Subarachnoid Hemorrhage (SAH)<\/strong> or massive stroke\u2014can cause dramatic repolarization changes due to a massive &#8220;catecholamine storm&#8221; affecting the myocardium.<sup><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Massive, deeply inverted, wide-based T-waves (Cerebral T-waves) and a prolonged QT<sub>C<\/sub>.<\/li>\n\n\n\n<li class=\"\">Unlike Ischemic T-waves, these are usually much more diffuse and wider.<\/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. Pulmonary Embolism<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While <strong>Sinus Tachycardia<\/strong> is the most common finding, look for signs of acute right ventricular (RV) strain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>S1Q3T3 Pattern:<\/strong> A deep S-wave in Lead I, a Q-wave in Lead III, and an inverted T-wave in Lead III (present in only ~20% of cases).<\/li>\n\n\n\n<li class=\"\"><strong>Right Axis Deviation:<\/strong> Shifting of the QRS axis to the right.<\/li>\n\n\n\n<li class=\"\"><strong><a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11748387\/\" type=\"link\" id=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11748387\/\">RBBB<\/a>:<\/strong> New-onset Right Bundle Branch Block, often transient.<\/li>\n\n\n\n<li class=\"\"><strong>T-wave Inversions:<\/strong> Specifically in the right precordial leads (V1\u2013V4).<\/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\">4. Metabolic &amp; Endocrine<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Hypothermia:<\/strong> Look for the <strong>Osborn Wave (J-wave)<\/strong>\u2014a hump at the junction of the QRS and ST segment. You may also see shivering artifact or bradyarrhythmias.<\/li>\n\n\n\n<li class=\"\"><strong>Hypothyroidism (Myxedema):<\/strong> Low voltage QRS complexes, sinus bradycardia, and flattened T-waves.<\/li>\n\n\n\n<li class=\"\"><strong>Thyrotoxicosis:<\/strong> Sinus tachycardia and a high incidence of new-onset <strong>Atrial Fibrillation<\/strong>.<\/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\">5. Gastrointestinal Conditions<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Acute Abdomen\/<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10340731\/\" type=\"link\" id=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10340731\/\">Pancreatitis<\/a>:<\/strong> Can occasionally mimic an inferior MI with <a href=\"https:\/\/journals.lww.com\/md-journal\/fulltext\/2024\/02160\/acute_pancreatitis_presented_with_diffuse.25.aspx\" type=\"link\" id=\"https:\/\/journals.lww.com\/md-journal\/fulltext\/2024\/02160\/acute_pancreatitis_presented_with_diffuse.25.aspx\">ST-segment elevations<\/a> or T-wave inversions. The exact mechanism is debated but likely involves vagal reflexes or proteolytic enzyme effects on the pericardium.<\/li>\n\n\n\n<li class=\"\"><strong>Pneumoperitoneum:<\/strong> Can cause <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12474740\/\" type=\"link\" id=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12474740\/\">shifted axis<\/a> or loss of R-wave progression due to the diaphragm being pushed upward.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>It is a common clinical pitfall to assume every ST-segment elevation or T-wave inversion points to a primary coronary event. In reality, the heart is often an &#8220;innocent bystander&#8221; reflecting systemic derangements. Here is a breakdown of significant ECG changes seen in non-cardiac conditions: 1. Electrolyte Imbalances Electrolytes govern the action potential; when they shift, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23231,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-23225","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>ECG Changes in Non-Cardiac Conditions - 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\/ecg-changes-in-non-cardiac-conditions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ECG Changes in Non-Cardiac Conditions - All About Heart And Blood Vessels\" \/>\n<meta property=\"og:description\" content=\"It is a common clinical pitfall to assume every ST-segment elevation or T-wave inversion points to a primary coronary event. 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