[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-408858-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-408858-en":130},{"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","acns-standardized-critical-care-eeg-terminology-2021-reference-chart-a-eeg-background","ACNS Standardized Critical Care EEG Terminology 2021 - Reference Chart - A. EEG Background","","ACNS Standardized Critical Care EEG Terminology 2021 provides a reference chart for systematically describing critical care EEG features. It details EEG background symmetry and frequency bands, including delta, theta, and alpha-related findings, plus continuity, reactivity, state changes, voltage thresholds, AP gradient, and breach effects. The chart also defines epileptiform findings such as sporadic discharges prevalence and rhythmic or periodic patterns, with main terms and modifiers covering prevalence, duration, frequency, phases, sharpness, amplitude measures, stimulus response, and evolution.",{"@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/acns-standardized-critical-care-eeg-terminology-2021-reference-chart-a-eeg-background/408858/",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/acns-standardized-critical-care-eeg-terminology-2021-reference-chart-a-eeg-background/408858.png","ImageObject",300,407,{"name":42,"@type":43},"hdkawk","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-09-28",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",19,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"How does the reference chart categorize EEG background symmetry and frequency?","Question",{"text":63,"@type":64},"It uses symmetry (symmetric, mild or marked asymmetry) combined with background frequency bands such as delta, theta, and alpha, and links these to presence or absence of features like PDR and continuity.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What are the main terms for rhythmic and periodic patterns (RPPs)?",{"text":68,"@type":64},"The chart provides main term groupings including generalized (G), lateralized (L), bilateral independent (BI), unilateral independent (UI), and multifocal (Mf), each with optional localization details.",{"name":70,"@type":61,"acceptedAnswer":71},"How are electrographic seizures and electrographic status epilepticus defined?",{"text":72,"@type":64},"Electrographic seizure requires epileptiform discharges averaging above a frequency threshold for at least 10 seconds, or any definite-evolving pattern lasting at least 10 seconds; electrographic status epilepticus requires an electrographic seizure lasting at least 10 continuous minutes or exceeding 20% of any 60-minute recording period.","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},408858,1790742790,{"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":55,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":107,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":26,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":97,"preview_page_count":4},3985747859855,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","ACNS Standardized Critical Care EEG Terminology 2021:  \nReference Chart  \nA. EEG Background  \n\n| Symmetry | Background EEG frequency |  | PDR | Continuity | Reactivity | State Changes | Cyclic Alternating Pattern of Encephalopathy (CAPE) | Voltage | AP Gradient | Breach effect |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| Symmetric | Delta |  | Present\u003Cbr>Specify\u003Cbr>frequency | Continuous:\u003C1% periods of suppression (\u003C10 µV) or attenuation (>10µV but \u003C50% of background voltage) | Present | Present with normal stage N2 sleep transients |  | Normal\u003Cbr>>20 µV | Present | Present |\n|  |  |  |  |  |  |  | Present |  |  |  |\n| Mild\u003Cbr>asymmetry\u003Cbr>\u003C50% Amp.\u003Cbr>0.5-1/s Freq. | Theta |  | Absent |  | SIRPIDs\u003Cbr>only | Present but with abnormal stage N2 sleep transients |  | Low\u003Cbr>10 to \u003C20\u003Cbr>µV | Absent | Absent |\n|  |  |  |  |  |  |  | Absent |  |  |  |\n|  |  |  |  | Nearly continuous: 1-9% periods of suppression attenuation |  |  |  |  |  |  |\n|  | >Alpha |  |  |  | Absent | Present but without stage N2 sleep transients |  | Suppressed\u003Cbr>\u003C10 µV | Reverse | Unclear |\n| Marked\u003Cbr>asymmetry\u003Cbr>≥50% Amp.\u003Cbr>>1/s Freq. |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  | Unknown/unclear |  |  |  |\n|  |  | If Burstsuppression or Burst-attenuation then specify if:\u003Cbr>|  | Discontinuous:\u003Cbr>10-49% periods of\u003Cbr>suppression or\u003Cbr>attenuation | Unclear | Absent |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |\n| Highly Epileptiform\u003Cbr>Bursts (Present or\u003Cbr>Absent) |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  | Burst-suppression\u003Cbr>or\u003Cbr>Burst-attenuation:\u003Cbr>50-99% periods of\u003Cbr>suppression or\u003Cbr>attenuation |  |  |  |  |  |  |\n| Identical Bursts\u003Cbr>(Present or Absent) |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  | Suppression:\u003Cbr>>99% periods of\u003Cbr>suppression or\u003Cbr>attenuation |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |\n\nEpileptiform Findings (including Rhythmic and Periodic Patterns)  \n\n| B. Sporadic Epileptiform Discharges |\n| --- |\n| Prevalence |\n| Abundant\u003Cbr>>1/10s |\n| Frequent\u003Cbr>≥1/min but \u003C1/10s |\n| Occasional\u003Cbr>≥1/h but \u003C1/min |\n| Rare\u003Cbr>\u003C1/h |\n\nC. Rhythmic and Periodic Patterns (RPPs)  \n\n| Main term 1 |\n| --- |\n| G\u003Cbr>Generalized\u003Cbr>- Optional : Specify frontally, midline or occipitally predominant; or generalized, not otherwise specified. |\n| L\u003Cbr>Lateralized\u003Cbr>-Optional: Specify unilateral or bilateral asymmetric\u003Cbr>-Optional: Specify lobe(s) most involved or hemispheric |\n| BI\u003Cbr>Bilateral Independent\u003Cbr>-Optional: Specify symmetric or asymmetric\u003Cbr>-Optional: Specify lobe(s) most involved or hemispheric |\n| UI\u003Cbr>Unilateral Independent\u003Cbr>- Optional: Specify unilateral or bilateral asymmetric for each pattern\u003Cbr>-Optional: Specify lobe(s) most involved |\n| Mf\u003Cbr>Multifocal\u003Cbr>-Optional: Specify symmetric or asymmetric\u003Cbr>-Optional: Specify lobe(s) most involved or hemispheric |\n\n\n| Main term 2 |\n| --- |\n| PD\u003Cbr>Periodic Discharges |\n| RDA\u003Cbr>Rhythmic Delta Activity |\n| SW\u003Cbr>Spike and Wave OR\u003Cbr>Polyspike and Wave OR\u003Cbr>Sharp and Wave |\n\nMajor modifiers  \n\n| Prevalence | Duration | Frequency | Phases1 | Sharpness2 | Absolute Amplitude | Relative Amplitude3 | Stimulus Induced or Stimulus Terminated | Evolution4 |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| Continuous\u003Cbr>>90% | Very long\u003Cbr>>1 h | 4/s | >3 | Spiky\u003Cbr>\u003C70 ms | High\u003Cbr>>150 µV | >2 | SI\u003Cbr>Stimulus Induced | Evolving |\n|  |  | 3.5/s |  |  |  |  |  |  |\n|  |  |  | 3 |  |  |  |  |  |\n|  |  |  |  |  |  | \u003C2 | ST\u003Cbr>Stimulus\u003Cbr>Terminated | Fluctuating |\n| Abundant\u003Cbr>50-89% | Long\u003Cbr>10-59 min |  |  | Sharp\u003Cbr>70-200 ms | Medium\u003Cbr>50-149 µV |  |  |  |\n|  |  | 3/s |  |  |  |  |  |  |\n|  |  |  | 2 |  |  |  |  |  |\n|  |  |  |  |  |  |  |  | Static |\n|  |  | 2.5/s |  |  |  |  |  |  |\n|  |  |  |  |  |  |  | Spontaneous only |  |\n| Frequent\u003Cbr>10-49% | Intermediate\u003Cbr>duration\u003Cbr>1-9.9 min | 2/s | 1 | Sharply\u003Cbr>contoured\u003Cbr>>200 ms | Low\u003Cbr>20-49 µV |  |  |  |\n|  |  |  |  |  |  |  |","cbCaigXq8Ybmgsuk","https://ap.wps.com/l/cbCaigXq8Ybmgsuk","pdf",625816,"English","# A. EEG Background\n## Symmetry and background frequency\n## Epileptiform findings (including rhythmic and periodic patterns)\n### B. Sporadic epileptiform discharges\n### C. Rhythmic and periodic patterns (RPPs)\n## Major modifiers\n## Minor modifiers\n## Plus (+) modifiers\n## D. Electrographic and electroclinical seizures","[{\"question\":\"How does the reference chart categorize EEG background symmetry and frequency?\",\"answer\":\"It uses symmetry (symmetric, mild or marked asymmetry) combined with background frequency bands such as delta, theta, and alpha, and links these to presence or absence of features like PDR and continuity.\"},{\"question\":\"What are the main terms for rhythmic and periodic patterns (RPPs)?\",\"answer\":\"The chart provides main term groupings including generalized (G), lateralized (L), bilateral independent (BI), unilateral independent (UI), and multifocal (Mf), each with optional localization details.\"},{\"question\":\"How are electrographic seizures and electrographic status epilepticus defined?\",\"answer\":\"Electrographic seizure requires epileptiform discharges averaging above a frequency threshold for at least 10 seconds, or any definite-evolving pattern lasting at least 10 seconds; electrographic status epilepticus requires an electrographic seizure lasting at least 10 continuous minutes or exceeding 20% of any 60-minute recording period.\"}]","ACNS Standardized Critical Care EEG Terminology 2021 - Reference Chart - A. EEG Background | PDF",1790580799]