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So far, the serum concentrations of these vitamins have not yet been studied in dogs with congenital extrahepatic portosystemic shunts (EHPSS), who also have some degree of liver dysfunction. The objective was to assess serum vitamin concentrations in dogs with EHPSS from diagnosis to complete closure. A prospective cohort study was performed using ten client-owned dogs with EHPSS, closed after gradual surgical attenuation. Serum concentrations of vitamin A, 25-hydroxyvitamin D, folic acid, cobalamin and methylmalonic acid (MMA) were measured at diagnosis prior to institution of medical therapy, prior to surgery, and three months after gradual attenuation and complete closure of the EHPSS.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>At diagnosis, median serum concentrations of vitamin A, 25-hydroxyvitamin D and folic acid were 18.2 \u03bcg\/dL (8.8 - 79.5 \u03bcg\/dL), 51.8 ng\/mL (19.4 - 109.0 ng\/mL), and 8.1 \u03bcg\/L (5.2 - 14.5 \u03bcg\/L), respectively, which increased significantly postoperatively (88.3 \u03bcg\/dL (51.6 - 182.2 \u03bcg\/dL, <jats:italic>P<\/jats:italic>=0.005), 89.6 ng\/mL (49.3 - &gt;150.0 ng\/mL, <jats:italic>P<\/jats:italic> =0.005), and 14.8 \u03bcg\/L (11.5 - 17.7 \u03bcg\/L, <jats:italic>P<\/jats:italic> &lt;0.001), respectively). Median serum cobalamin concentrations were 735.5 ng\/L (470 - 1388 ng\/L) at diagnosis and did not significantly decrease postoperatively (<jats:italic>P<\/jats:italic> =0.122). Both at diagnosis and three months postoperatively 7\/10 dogs had hypercobalaminemia.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Serum concentrations of vitamin A, 25-hydroxyvitamin D and folic acid significantly increase after surgical attenuation. Nevertheless, persistent hypercobalaminemia is suggestive of ongoing liver dysfunction, despite successful surgery.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12917-021-03123-1","type":"journal-article","created":{"date-parts":[[2022,1,6]],"date-time":"2022-01-06T06:02:27Z","timestamp":1641448947000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Persistent hypercobalaminemia three months after successful gradual attenuation of extrahepatic shunts in dogs: a prospective cohort study"],"prefix":"10.1186","volume":"18","author":[{"given":"Nausikaa","family":"Devriendt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gon\u00e7alo","family":"Serrano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominique","family":"Paepe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Vandenabeele","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emmelie","family":"Stock","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hilde","family":"de Rooster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,1,6]]},"reference":[{"issue":"3","key":"3123_CR1","doi-asserted-by":"publisher","first-page":"537","DOI":"10.1016\/S0025-7125(16)31686-8","volume":"63","author":"RM Russell","year":"1979","unstructured":"Russell RM. 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