Thoracic epidural analgesia is often proposed to thoracotomized patients. A local anesthetic
and an opioid are generally associated to produce an epidural analgesia. However, opioid
epidural administration is frequently associated with adverse effects as nausea, vomiting,
urinary retention, ... On the other hand, iv ketamine has been demonstrated to be an
The purpose of the study is to compare the epidural administration of levobupivacaine and
sufentanil or the epidural administration of levobupivacaine associated with the iv
administration of ketamine.