Retraction Note to: J Anesth (2007) 21:164–170 DOI 10.1007/s00540-006-0468-8

This article published in J Anesth 2007;21:164–170 has been retracted by the Editor-in-Chief as Fig. 1C has been used to depict different experimental conditions in Fig. 1B in Eur J Pharmacol 2007;564:174–180. A decision of misconduct was reached after an investigation by Oita University.