Acta anaesthesiologica Scandinavica
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Registration of interventional studies is necessary according to the Declaration of Helsinki but implementation has been a challenge for many journals. Acta Anaesthesiologica Scandinavica (Acta) requires registration for studies conducted after January 1(st) 2010. We aimed to assess the proportion of correctly registered randomized controlled trials (RCTs) published in Acta from 2009 to 2014. ⋯ Many published randomized controlled trials from Acta Anaesthesiologica Scandinavica were not adequately registered but the requirement of trial registration has resulted in a significant increase in the proportion of correctly registered trials.