"QT interval and antidepressant use: a cross sectional study of electronic health records"
BMJ Jan 2, 2013
http://www.bmj.com/content/346/bmj.f288
"Conclusions
This study confirmed a modest prolongation of QT interval with citalopram, and identified additional antidepressants with similar observed risk. Pharmacovigilance studies using electronic health record data may be a useful method of identifying potential risk associated with treatments."