The U wave is a wave on an electrocardiogram (ECG). It comes after the T wave of ventricular repolarization and may not always be observed as a result of its small size. 'U' waves are thought to represent repolarization of the Purkinje fibers.\nHowever, the exact source of the U wave remains unclear. The most common theories for the origin are:
- Delayed repolarization of Purkinje fibers \n
- Prolonged re-polarisation of mid-myocardial M-cells \n
- After-potentials resulting from mechanical forces in the ventricular wall \n
- The repolarization of the papillary muscle.
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{"type":"standard","title":"Tornado outbreak of April 27–28, 2002","displaytitle":"Tornado outbreak of April 27–28, 2002","namespace":{"id":0,"text":""},"wikibase_item":"Q4600267","titles":{"canonical":"Tornado_outbreak_of_April_27–28,_2002","normalized":"Tornado outbreak of April 27–28, 2002","display":"Tornado outbreak of April 27–28, 2002"},"pageid":2471178,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002.png/330px-Tornado_outbreak_of_April_27%E2%80%9328%2C_2002.png","width":320,"height":226},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/2/23/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002.png","width":3507,"height":2480},"lang":"en","dir":"ltr","revision":"1284047316","tid":"ebd3dc8b-11eb-11f0-ab02-5aa253433381","timestamp":"2025-04-05T07:02:22Z","description":"Tornado Outbreak in April 2002","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002","revisions":"https://en.wikipedia.org/wiki/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002?action=history","edit":"https://en.wikipedia.org/wiki/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Tornado_outbreak_of_April_27%E2%80%9328%2C_2002"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002","edit":"https://en.m.wikipedia.org/wiki/Tornado_outbreak_of_April_27%E2%80%9328%2C_2002?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Tornado_outbreak_of_April_27%E2%80%9328%2C_2002"}},"extract":"A widespread, destructive tornado outbreak affected Iowa, Kansas, Missouri, and Nebraska on April 27, 2002, and Illinois, Indiana, Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia on the following day, April 28. Generally, tornado reports were widely scattered in each state, but significant to severe damage was noted in multiple states. Overall, 48 tornadoes were confirmed along with 6 deaths, 256 injuries, and $224 million in damage, with wind and hail adding to the damage total.","extract_html":"
A widespread, destructive tornado outbreak affected Iowa, Kansas, Missouri, and Nebraska on April 27, 2002, and Illinois, Indiana, Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia on the following day, April 28. Generally, tornado reports were widely scattered in each state, but significant to severe damage was noted in multiple states. Overall, 48 tornadoes were confirmed along with 6 deaths, 256 injuries, and $224 million in damage, with wind and hail adding to the damage total.
"}