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An \u201colive\u201d was palpated in only 13.6% of cases. This is in contrast to older studies, where more than 50% of the patients were reported to have a palpable \u201colive\u201d depending on when the study was conducted. In patients from this institution, hypochloremia was present in 23% and alkalosis in 14.4%, which are less frequent than the incidence of these abnormalities in older studies. There was a change in the additional \u201cclassical\u201d symptoms, represented by the lower percentage of infants in whom an \u201colive\u201d was palpated and the lower numbers of patients with severe electrolyte imbalances. The reason for this change appears to be the frequent use of ultrasound.<\/jats:p>","DOI":"10.1177\/0009922810384846","type":"journal-article","created":{"date-parts":[[2010,11,23]],"date-time":"2010-11-23T20:36:52Z","timestamp":1290544612000},"page":"192-195","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":38,"title":["The Changing Clinical Presentation of Hypertrophic Pyloric Stenosis: The Experience of a Large, Tertiary Care Pediatric Hospital"],"prefix":"10.1177","volume":"50","author":[{"given":"Miguel","family":"Glatstein","sequence":"first","affiliation":[{"name":"University of Toronto, Toronto, ON, Canada,"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gary","family":"Carbell","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"family":"Sirisha Kusuma Boddu","sequence":"additional","affiliation":[{"name":"University of Toronto, Toronto, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Annalucia","family":"Bernardini","sequence":"additional","affiliation":[{"name":"University of Toronto, Toronto, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dennis","family":"Scolnik","sequence":"additional","affiliation":[{"name":"University of Toronto, Toronto, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2010,11,22]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(84)90904-8"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpedsurg.2007.10.039"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199208203270802"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpedsurg.2007.10.006"},{"key":"atypb5","unstructured":"Wyllie R. 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