Hopefully there are some anesthesiologists lurking who may have some input. I practice thoracic surgery in a hospital with four anesthesiologists. Three use thoracic epidurals with fentanyl for pain control. The fourth uses a lumbar epidural with Dura morph (no marcaine). Whenever I do a case with the latter, fluid requirements are massive (12 vs 3 liters in 24 hours) and then I chase my tail trying to rid the patient of fluid. The literature and the anesthesiologists say this is not the fault of the epidural Dura morph, but I can't find another cause. Any one want to tackle this?