{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T22:09:29Z","timestamp":1776290969606,"version":"3.50.1"},"reference-count":22,"publisher":"BMJ","issue":"1","funder":[{"DOI":"10.13039\/501100004885","name":"Ume\u00e5 Universitet","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004885","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2017,12,13]]},"published-print":{"date-parts":[[2018,1]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To analyse the completeness in GallRiks of the follow-up frequency in relation to the intraoperative and postoperative outcome.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Population-based register study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Data from the national Swedish Registry for Gallstone Surgery and Endoscopic Retrograde Cholangiopancreatography (ERCP), GallRiks.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Population<\/jats:title>\n                    <jats:p>All cholecystectomies and ERCPs recorded in GallRiks between 1 January 2006 and 31 December 2014.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main outcome measures<\/jats:title>\n                    <jats:p>Outcomes for intraprocedural as well as postprocedural adverse events between units with either a 30-day follow-up of \u226590% compared with those with a less frequent follow-up (&lt;90%).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Between 2006 and 2014, 162 212 cholecystectomies and ERCP procedures were registered in GallRiks. After the exclusion of non-index procedures and those with incomplete data 152 827 procedures remained for final analyses. In patients having a cholecystectomy, there were no differences regarding the adverse event rates, irrespective of the follow-up frequency. However, in the more complicated endoscopic ERCP procedures, the postoperative adverse event rates were significantly higher in those with a more frequent and complete 30-day follow-up (OR 1.92; 95%\u2009CI 1.76 to 2.11).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Differences in the follow-up frequency in registries affect the reported outcomes as exemplified by the complicated endoscopic ERCP procedures. A high and complete follow-up rate shall serve as an additional quality indicator for surgical registries.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2017-019551","type":"journal-article","created":{"date-parts":[[2018,1,23]],"date-time":"2018-01-23T04:56:02Z","timestamp":1516683362000},"page":"e019551","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Inversed relationship between completeness of follow-up and coverage of postoperative complications in gallstone surgery and ERCP: a potential source of bias in patient registers"],"prefix":"10.1136","volume":"8","author":[{"given":"Lars","family":"Enochsson","sequence":"first","affiliation":[{"name":"Department of Surgical and Perioperative Sciences, Sunderby Research Unit, Ume\u00e5 University, Lule\u00e5, 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