The fourth heart sound or S4 is an extra heart sound that occurs during late diastole, immediately before the normal two \"lub-dub\" heart sounds (S1 and S2). It occurs just after atrial contraction and immediately before the systolic S1 and is caused by the atria contracting forcefully in an effort to overcome an abnormally stiff or hypertrophic ventricle.
"}{"type":"standard","title":"Katherine Hagedorn","displaytitle":"Katherine Hagedorn","namespace":{"id":0,"text":""},"wikibase_item":"Q15993044","titles":{"canonical":"Katherine_Hagedorn","normalized":"Katherine Hagedorn","display":"Katherine Hagedorn"},"pageid":41144749,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/en/3/34/Katherine_Hagedorn_headshot.jpg","width":292,"height":342},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/en/3/34/Katherine_Hagedorn_headshot.jpg","width":292,"height":342},"lang":"en","dir":"ltr","revision":"1278646097","tid":"28648711-f860-11ef-8707-fd7ce9989c58","timestamp":"2025-03-03T18:48:55Z","description":"American ethnomusicologist","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Katherine_Hagedorn","revisions":"https://en.wikipedia.org/wiki/Katherine_Hagedorn?action=history","edit":"https://en.wikipedia.org/wiki/Katherine_Hagedorn?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Katherine_Hagedorn"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Katherine_Hagedorn","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Katherine_Hagedorn","edit":"https://en.m.wikipedia.org/wiki/Katherine_Hagedorn?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Katherine_Hagedorn"}},"extract":"Katherine Johanna Hagedorn was an American ethnomusicologist. Born in Summit, New Jersey to a white family, she became a traditional Cuban drummer and Santería priestess.","extract_html":"
Katherine Johanna Hagedorn was an American ethnomusicologist. Born in Summit, New Jersey to a white family, she became a traditional Cuban drummer and Santería priestess.
"}{"slip": { "id": 172, "advice": "If it still itches after a week, go to the doctors."}}
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