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We used magnetocardiography to measure fetal QT intervals in mothers with OUD on buprenorphine therapy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Fetal and maternal magnetocardiography was performed in pregnant women receiving buprenorphine\u2010assisted treatment (Disorder group); these were matched by gestational age to pregnant women who were opiate na\u00efve (Reference group). Corrected QT intervals were determined using Bazett's formula and compared between groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of eight women in the Disorder group matched to eight in the Reference group. Seven of the mothers (88%) in the Disorder group were smokers; there were no smokers in the Reference group. The average fetal corrected QT was significantly longer (<jats:italic>P<\/jats:italic> =\u20090.022) in the Disorder group than that in the Reference group (505 milliseconds [ms]\u2009\u00b1\u200968.6 [standard deviation] vs 383\u2009ms\u2009\u00b1\u200970.3 [standard deviation]).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Novel data from this small sample demonstrate prolongation of fetal corrected QT in women with OUD participating in buprenorphine assisted therapy. Additional investigation from a larger sample is needed to clarify if fetal buprenorphine and\/or tobacco exposure is associated with changes in fetal QT which would warrant further prenatal and postnatal testing.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jog.14055","type":"journal-article","created":{"date-parts":[[2019,7,12]],"date-time":"2019-07-12T04:18:44Z","timestamp":1562905124000},"page":"1989-1996","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Magnetocardiographic identification of prolonged fetal corrected QT interval in women receiving treatment for opioid use disorder"],"prefix":"10.1111","volume":"45","author":[{"given":"Elijah H.","family":"Bolin","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Division of Cardiology University of Arkansas for Medical Sciences, Arkansas Children's Hospital  Little Rock Arkansas 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for Medical Sciences  Little Rock Arkansas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica","family":"Coker","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of Arkansas for Medical Sciences  Little Rock Arkansas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zachary N.","family":"Stowe","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of Wisconsin at Madison  Madison Wisconsin USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hari","family":"Eswaran","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology University of Arkansas for Medical Sciences  Little Rock Arkansas 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