{"id":18110,"date":"2021-10-04T09:25:55","date_gmt":"2021-10-04T03:55:55","guid":{"rendered":"https:\/\/johnsonfrancis.org\/general\/?p=18110"},"modified":"2021-10-04T09:31:33","modified_gmt":"2021-10-04T04:01:33","slug":"what-is-an-ecg","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/general\/what-is-an-ecg\/","title":{"rendered":"What is an ECG?"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/EpLkR7JQy_o\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"><\/iframe><\/p>\n<h2><span style=\"color: #008000;\">What is an electrocardiogram, known in short as ECG?<\/span><\/h2>\n<p>ECG is the recording of the electrical activity of the heart. The electrical system of the heart produces regular tiny electrical currents which travel through out the heart in a systematic manner. When these currents are recorded from the surface of the body, it is called an ECG.<\/p>\n<figure id=\"attachment_18111\" aria-describedby=\"caption-attachment-18111\" style=\"width: 946px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18111 size-full\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/12-Lead-ECG.png\" alt=\"12 Lead ECG\" width=\"946\" height=\"464\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/12-Lead-ECG.png 946w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/12-Lead-ECG-300x147.png 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/12-Lead-ECG-768x377.png 768w\" sizes=\"auto, (max-width: 946px) 100vw, 946px\" \/><figcaption id=\"caption-attachment-18111\" class=\"wp-caption-text\">12 Lead ECG<\/figcaption><\/figure>\n<p>The electrical currents synchronize the contractions of the various regions of the heart. First the upper chambers contract and after a delay, the lower chambers contract.<br \/>\nThis delay is needed for the proper filling of the lower chambers when the upper chambers contract. Contraction of the lower chambers pump blood to various parts of the body.<\/p>\n<figure id=\"attachment_18112\" aria-describedby=\"caption-attachment-18112\" style=\"width: 869px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18112 size-full\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/ECG-electrode-positions.jpg\" alt=\"ECG electrode positions\" width=\"869\" height=\"488\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/ECG-electrode-positions.jpg 869w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/ECG-electrode-positions-300x168.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/ECG-electrode-positions-768x431.jpg 768w\" sizes=\"auto, (max-width: 869px) 100vw, 869px\" \/><figcaption id=\"caption-attachment-18112\" class=\"wp-caption-text\">ECG electrode positions<\/figcaption><\/figure>\n<p>ECG is recorded by placing multiple electrodes on designated parts of the body and connecting them to the ECG machine. Typically, four electrodes are connected to all four limbs and 6 electrodes are placed on the chest.<\/p>\n<figure id=\"attachment_18114\" aria-describedby=\"caption-attachment-18114\" style=\"width: 520px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18114\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Waves-in-an-ECG.jpg\" alt=\"Waves in an ECG\" width=\"520\" height=\"386\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Waves-in-an-ECG.jpg 520w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Waves-in-an-ECG-300x223.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Waves-in-an-ECG-220x162.jpg 220w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><figcaption id=\"caption-attachment-18114\" class=\"wp-caption-text\">Waves in an ECG<\/figcaption><\/figure>\n<p>The important waves seen in an ECG are P, QRS complex and T wave. Pattern of the waves changes between the ECG leads.<br \/>\nComing back to the 12 lead ECG shown initially, the different leads are obtained by various combinations of the surface electrodes. The connections can be switched inside the ECG machine.<\/p>\n<figure id=\"attachment_18115\" aria-describedby=\"caption-attachment-18115\" style=\"width: 866px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18115\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Chest-leads.jpg\" alt=\"Chest leads\" width=\"866\" height=\"488\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Chest-leads.jpg 866w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Chest-leads-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Chest-leads-768x433.jpg 768w\" sizes=\"auto, (max-width: 866px) 100vw, 866px\" \/><figcaption id=\"caption-attachment-18115\" class=\"wp-caption-text\">Chest leads<\/figcaption><\/figure>\n<p>Leads called V1 to V6 are the recordings from the electrodes placed over the chest. They are recorded from specified regions of the chest.<\/p>\n<figure id=\"attachment_18116\" aria-describedby=\"caption-attachment-18116\" style=\"width: 878px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18116\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Limb-leads.jpg\" alt=\"Limb leads\" width=\"878\" height=\"483\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Limb-leads.jpg 878w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Limb-leads-300x165.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Limb-leads-768x422.jpg 768w\" sizes=\"auto, (max-width: 878px) 100vw, 878px\" \/><figcaption id=\"caption-attachment-18116\" class=\"wp-caption-text\">Limb leads<\/figcaption><\/figure>\n<p>The other leads are known as limb leads. Limb leads are produced by combining electrical signals from the limbs (arms and legs) in various specified combinations, within the machine.<\/p>\n<figure id=\"attachment_18117\" aria-describedby=\"caption-attachment-18117\" style=\"width: 880px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18117\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Rhythm-strip.jpg\" alt=\"Rhythm strip\" width=\"880\" height=\"487\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Rhythm-strip.jpg 880w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Rhythm-strip-300x166.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/Rhythm-strip-768x425.jpg 768w\" sizes=\"auto, (max-width: 880px) 100vw, 880px\" \/><figcaption id=\"caption-attachment-18117\" class=\"wp-caption-text\">Rhythm strip<\/figcaption><\/figure>\n<p>The lower part of the image shows continuous recording from one lead. This is called a rhythm strip, meant for checking abnormalities in heart rhythm.<\/p>\n<figure id=\"attachment_18119\" aria-describedby=\"caption-attachment-18119\" style=\"width: 872px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18119 size-full\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/P-wave.jpg\" alt=\"P wave\" width=\"872\" height=\"492\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/P-wave.jpg 872w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/P-wave-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/P-wave-768x433.jpg 768w\" sizes=\"auto, (max-width: 872px) 100vw, 872px\" \/><figcaption id=\"caption-attachment-18119\" class=\"wp-caption-text\">P wave<\/figcaption><\/figure>\n<p>The contraction of the upper chambers of the heart start soon after the beginning of the P wave, which represents the electrical activity of the upper chambers.<\/p>\n<figure id=\"attachment_18120\" aria-describedby=\"caption-attachment-18120\" style=\"width: 877px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18120\" src=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/QRS-and-T-wave.jpg\" alt=\"QRS and T wave\" width=\"877\" height=\"494\" srcset=\"https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/QRS-and-T-wave.jpg 877w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/QRS-and-T-wave-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/general\/wp-content\/uploads\/2021\/10\/QRS-and-T-wave-768x433.jpg 768w\" sizes=\"auto, (max-width: 877px) 100vw, 877px\" \/><figcaption id=\"caption-attachment-18120\" class=\"wp-caption-text\">QRS and T wave<\/figcaption><\/figure>\n<p>QRS complex and T wave are the electrical signals from the lower muscular chambers of the heart. ECG changes in a heart attack are usually manifest in these waves.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is an electrocardiogram, known in short as ECG? ECG is the recording of the electrical activity of the heart. The electrical system of the heart produces regular tiny electrical currents which travel through out the heart in a systematic manner. When these currents are recorded from the surface of the body, it is called [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18123,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-18110","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>What is an ECG? - 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\/what-is-an-ecg\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is an ECG? - All About Heart And Blood Vessels\" \/>\n<meta property=\"og:description\" content=\"What is an electrocardiogram, known in short as ECG? 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