Chronic Pain, especially neuropathic pain, are adverse events after posterolateral thoracotomy for lung resection. The continuous application of ketamine may have a prophylactic effect and helps to prevent chronic pain. The investigators record the incidence and severity of acute pain and neuropathic pain during a seven day period after thoracotomy as well as the incidence of chronic pain and neuropathic pain after one and three month period. Parallel Group design, comparing one Group with a continuous application (24 hours) of ketamine against a Placebo Group.
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Change in perioperative opioid consumption
Timeframe: seven days after operation
Change in acute pain
Timeframe: 7 days after Operation
acute neuropathic pain
Timeframe: 7 days after operation