{"id":22107,"date":"2017-07-24T08:32:44","date_gmt":"2017-07-24T03:02:44","guid":{"rendered":"https:\/\/cardiophile.org\/?p=22107"},"modified":"2022-11-09T20:32:42","modified_gmt":"2022-11-09T15:02:42","slug":"ecg-filter-settings-and-detection-of-pacemaker-spikes","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/professional\/ecg-filter-settings-and-detection-of-pacemaker-spikes\/","title":{"rendered":"ECG filter settings and detection of pacemaker spikes"},"content":{"rendered":"<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/MfcCUbpWDfw\" 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;\">ECG filter settings and detection of pacemaker spikes<\/span><\/h2>\n<p>In modern day digital ECGs, ECG filter settings can beautify the tracings, but vital information can be filtered out, as in this case, which is quite common. In the illustration below, 0.08 Hz is the <em>high pass filter<\/em>, meaning that the ECG amplifier passess all frequencies above that limit. 40 Hz is the low pass filter, indicating that all frequencies below that can pass through.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-32237\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2017\/07\/Filter-setting-and-pacemaker-spikes1.jpg\" alt=\"\" width=\"1300\" height=\"682\"><\/p>\n<p>Pacemaker spike (pacemaker artefact, pacemaker stimulus) being a high frequency signal, is effectively filtered out by the above filter setting. Hence the above ECG is likely to be diagnosed as left bundle branch block (LBBB) at one look,&nbsp;&nbsp;though we are missing the P waves before each QRS complex which would be expected in a simple LBBB with sinus rhythm.<\/p>\n<p style=\"text-align: center;\"><em><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-32239\" src=\"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2017\/07\/Filter-settings-and-pacemaker-spikes-2.jpg\" alt=\"\" width=\"1300\" height=\"686\">ECG with filter range 0.08 &#8211; 150 Hz &#8211; pacemaker spikes visible<\/em><\/p>\n<p>The pacemaker spikes are easily seen when the same ECG is repeated with a change in the low pass filter to 150 Hz. In fact both atrial and ventricular pacing spikes are seen before each QRS complex, with an interval in between. Hence this person has a functioning <a href=\"https:\/\/johnsonfrancis.org\/professional\/dual-chamber-pacemaker-chest-x-ray\/\">dual chamber pacemaker<\/a> in situ. The paced P waves are of low amplitude and hardly visible (or it could be lack of atrial response to atrial pacing &#8211; atrial capture failure). This highlights the importance of appropriate ECG filter settings for each case.<\/p>\n<p>The high pass filter is meant to filter out baseline fluctuations due to respiration and other low frequency signals, while low pass filter avoids muscle potential interference (EMG artefact). In addition, most ECG machines have a notch filter at 50 Hz to specifically filter out line voltage interference.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ECG filter settings and detection of pacemaker spikes In modern day digital ECGs, ECG filter settings can beautify the tracings, but vital information can be filtered out, as in this case, which is quite common. In the illustration below, 0.08 Hz is the high pass filter, meaning that the ECG amplifier passess all frequencies above [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":32237,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[6,7],"tags":[1349,1694,2187,2189,2231,2742,2749,2750,2759],"class_list":["post-22107","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecg-electrophysiology","category-ecg-library","tag-emg-artefact","tag-high-pass-filter","tag-line-voltage-filter","tag-line-voltage-notch-filter","tag-low-pass-filter","tag-pacemaker-artefact","tag-pacemaker-spike","tag-pacemaker-stimulus","tag-pacing-spike"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ECG filter settings and detection of pacemaker spikes - All About Cardiovascular System and Disorders<\/title>\n<meta name=\"description\" content=\"ECG filter settings: Low pass filter setting should be at least 100 Hz to pick up pacemaker spikes which are of high frequency.\" \/>\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\/ecg-filter-settings-and-detection-of-pacemaker-spikes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ECG filter settings and detection of pacemaker spikes - 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