The study aims to investigate the pharmacokinetic of ropivacaine in patients undergoing ultrasound guided thoracic paravertebral block (TPVB) both after a single-bolus injection via the thoracic paravertebral catheter given before the start of surgery and after continuous thoracic paravertebral infusion that will start after the end of the procedure in order to achieve postoperative analgesia after open thoracotomy during the first 3 postoperative days
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ropivacaine plasma levels
Timeframe: up to 72 postoperative hours after the initiation of continuous thoracic paravertebral infusion of ropivacaine