[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-370233-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-370233-en":131},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","ecg-interpretation-cheat-sheet","ECG Interpretation Cheat Sheet","","ECG interpretation explains what an electrocardiogram measures and how the electrical activity of the heart is translated into rhythm strips and ECG leads. It covers 12-lead ECG basics versus telemetry monitoring and provides guidance for reading and documenting rhythm strip findings. The guide breaks down key waveform components (P wave, QRS complex, T wave) and intervals, including PR, QRS width, QT/QTc, ST segment behavior, and T-wave patterns. It also outlines clinical implications such as heart blocks, bundle branch block, ischemia, infarction/STEMI criteria, and risks like torsades/VF.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/ecg-interpretation-cheat-sheet/370233/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/ecg-interpretation-cheat-sheet/370233.png","ImageObject",300,407,{"name":42,"@type":43},"Mabel","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-04","2026-09-23",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",17,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What does an ECG (EKG) measure and what can changes indicate?","Question",{"text":63,"@type":64},"An ECG measures the heart’s electrical tracing. Changes can indicate structural, mechanical, or electrical issues.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How is a rhythm strip time-split and where is it commonly monitored?",{"text":68,"@type":64},"A rhythm strip is 6 seconds split into two 3-second portions. It is especially relevant on telemetry floors and in settings like ED, ICU, telemetry, or cardiac units.",{"name":70,"@type":61,"acceptedAnswer":71},"What are the criteria for ST elevation and how does it relate to STEMI?",{"text":72,"@type":64},"ST elevation is defined as >1 mm in limb leads and >2 mm in precordial leads above the isoelectric line, indicating myocardial necrosis/infarction. It classically occurs during STEMI and requires ST-segment elevation in 2 contiguous leads.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},370233,1790270179,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,110,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":108,"slug":109},7,40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":112,"show_sort_weight":113,"slug":114},8,"Research & Report",30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":124,"doc_module":4,"doc_module_name":25,"category_name":125,"show_sort_weight":124,"slug":126},10,"Lifestyle","lifestyle",{"id":128,"doc_module":4,"doc_module_name":25,"category_name":129,"show_sort_weight":97,"slug":130},19,"General","general",{"code":4,"msg":82,"data":132},{"doc_id":79,"user_id":133,"nickname":42,"user_avatar":134,"doc_module":4,"category_id":107,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":140,"language":141,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":12,"update_tm":145,"read_time":146},7971474920318,"https://ap-avatar.wpscdn.com/avatar/74000ee537e6b0ca360?x-image-process=image/resize,m_fixed,w_180,h_180&k=1788430171632181674","WHAT EXACTLY ISAN ECG?  \nAn ECG (or EKG )– which stands for electrocardiogram – looks at an electrical tracing of the  \ncardiac activity within your heart. Changes can indicate structural, mechanical, or electrical issues.  \nThe electrical tracing is referred to as a rhythm strip. Depending on the number of electrodes, this gives various different leads or views of the heart.  \nThe most common ECG is a 12-lead ECG, which utilizes 10 electrodes to get 12 different views of the heart. However, continuous telemetry monitoring usually utilizes 3-5 electrodes, viewing only a few important leads, with a primary lead (usually Lead II) being continuously monitored.  \nInterpreting a 12-lead ECG is advanced – primarily falling on the responsibility of the physician or advanced practice provider (APP) . However, interpreting rhythm strips (in a single lead) is super important for every inpatient nurse to know – especially those working in the ED, ICU, Telemetry, or Cardiac units.  \nTHE RHYTHM STRIP  \nA rhythm strip is made up of 6-seconds , split into two separate 3-second portions (marked by black marks above strip) . You will have to analyze and document readings every so often (usually every 8 hours)– especially if you are on a telemetry floor. If you work in the ED, you will have to do this initially on all those patients who it is required, writing your interpretation and any abnormalities. In critical situations , you will need to analyze a rhythm directly from the monitor or the defibrillator.  \nThe P-QRS-T complex is each heartbeat broken down into an electrical tracing. The Pwave occurs during atrial depolarization, which causes the atria to contract. The QRS complex signifies ventricular depolarizationwhen the ventricles contract. Finally , the Twave is when the ventricles repolarize – meaning the ventricular cells are electrically recharging for another contraction. There is no atrial repolarization seen because this is much smaller and is hidden within the QRS complex.  \nRemember the rhythm tracing indicates electrical impulses through the heart cells. Just because the electrical impulse is there does not mean the heart will have the mechanical response (i.e. contraction). This is the case during PEA.  \nWhile interpreting a rhythm strip, the graph paper boxes are there so you can easily compare and measure various parts of the tracing. The PR interval represents the amount of time it takes for the electrical impulse to go from the SA node in the atria, until it reaches the ventricles. This comes in handy when determining heart blocks, as blocks will slow conduction of the electrical impulse. Although it is called the PR interval, it actually is the length between the beginning of the P-wave and the beginning of the Q wave. The normal PR interval is 120-200 ms , or 3-5 small boxes. PR intervals that are consistent but longer than 200 ms indicates a 1st degree heart block.  \nThe QRS complex width represents how long the electrical impulse takes to depolarize the entire left and right ventricles. Normally , the QRS complex is narrow 80-100 ms (2-2.5 small boxes) . If this is widened , it indicates some type of bundle branch block – which is a delay of the conduction between the ventricles.  \nThe QT interval is the length of time it takes the electrical impulse to go from the beginning of the ventricles – until the ventricles completely repolarize and are ready for another contraction. This should be between 350-450 ms. If this is elongated – this presents an  \nincreased risk of various arrhythmias such as Torsades or Vfib, especially if > 500 ms. However, if the heart rate is abnormally slow (bradycardia) or fast (tachycardia) , this will not be accurately reflected. Due to this, the QT-c (QT-corrected) is usually used which corrects for the heart rate.  \nThe ST-segment indicates the beginning of ventricular recovery. The point between the QRS complex and where the ST-segment begins is called the J-point. The ST-segment can eith","cbCailW8OlfktZ8q","https://ap.wps.com/l/cbCailW8OlfktZ8q","pdf",8381649,14,"English","# Rhythm strip and ECG basics\n## What an ECG measures\n## Leads, electrodes, and telemetry\n# Core components and timing\n## P-QRS-T complex\n## PR interval and heart block\n## QRS width and bundle branch block\n## QT interval and QTc\n## ST segment, J-point, ischemia, infarction\n## T-wave changes and T-wave inversion","[{\"question\":\"What does an ECG (EKG) measure and what can changes indicate?\",\"answer\":\"An ECG measures the heart’s electrical tracing. Changes can indicate structural, mechanical, or electrical issues.\"},{\"question\":\"How is a rhythm strip time-split and where is it commonly monitored?\",\"answer\":\"A rhythm strip is 6 seconds split into two 3-second portions. It is especially relevant on telemetry floors and in settings like ED, ICU, telemetry, or cardiac units.\"},{\"question\":\"What are the criteria for ST elevation and how does it relate to STEMI?\",\"answer\":\"ST elevation is defined as \\u003e1 mm in limb leads and \\u003e2 mm in precordial leads above the isoelectric line, indicating myocardial necrosis/infarction. It classically occurs during STEMI and requires ST-segment elevation in 2 contiguous leads.\"}]","ECG Interpretation Cheat Sheet | PDF",1790187507,35]