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This Swedish study compared the corrected QT (QTc) intervals of adolescents on psychotropic medication with unmedicated controls, when supine and after rising rapidly.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The study was carried out at \u00d6stersund County Hospital in March 2022 and February to March 2023. It comprised 16 cases, aged 10\u201317\u2009years and 28 controls. QTc intervals were measured with electrocardiography and calculated using Bazett's and Fridericia's formulas. Univariate and multiple linear regressions were used to assess differences in QTc intervals between the cases and controls and across sex, age and body mass index.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The mean QTc interval when supine, calculated with Bazett's formula, was longer for the adolescents on psychotropic medication than the controls (<jats:italic>p<\/jats:italic>\u2009=\u20090.046). The same was true for the mean QTc interval after rising rapidly from the supine position, calculated with both Bazett's formula (<jats:italic>p<\/jats:italic>\u2009=\u20090.009) and Fridericia's formula (<jats:italic>p<\/jats:italic>\u2009=\u20090.007). Mean QTc intervals varied by sex and age groups. Psychotropic medication prolonged QTc intervals, particularly in girls.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Longer QTc intervals were found in adolescents on psychotropic medication, particularly after rising rapidly from the supine position.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apa.17206","type":"journal-article","created":{"date-parts":[[2024,3,22]],"date-time":"2024-03-22T12:20:07Z","timestamp":1711110007000},"page":"1621-1629","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Adolescents on psychotropic treatment displayed longer corrected <scp>QT<\/scp> intervals than unmedicated controls when they rose rapidly from the supine position"],"prefix":"10.1111","volume":"113","author":[{"given":"Vilma","family":"Berger","sequence":"first","affiliation":[{"name":"Department of Clinical Sciences, Unit of Paediatrics Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linn","family":"Brom\u00e9e","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Unit of Paediatrics Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Lindam","sequence":"additional","affiliation":[{"name":"Department of Public Health and Clinical Medicine, Unit of Research, Education and Development, \u00d6stersund Hospital Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tove","family":"Hallin","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Unit of Paediatrics Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bj\u00f6rn","family":"Reynisson","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Unit of Paediatrics Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linda","family":"Halldner\u00a0Henriksson","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Unit of Child and Adolescent Psychiatry Ume\u00e5 University  Ume\u00e5 Sweden"},{"name":"Department of Medical Epidemiology and Biostatistics Karolinska Institutet  Stockholm Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6090-494X","authenticated-orcid":false,"given":"Estelle","family":"Naumburg","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Unit of Paediatrics Ume\u00e5 University  Ume\u00e5 Sweden"},{"name":"Department of Public Health and Clinical Medicine, Unit of Research, Education and Development, \u00d6stersund Hospital Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,3,22]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00787-018-01269-2"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psym.2017.10.009"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.ajp.2019.1760501"},{"key":"e_1_2_12_5_1","unstructured":"Statistikdatabas f\u00f6r diagnoser [Internet]. 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