RESUMEN
Background@#The analgesic effect of perineural opioid in clinical practice are still controversial. This randomized controlled trial compared analgesic effect of ropivacaine with fentanyl or ropivacaine alone for continuous femoral nerve block following unilateral total knee arthroplasty. @*Methods@#Fourty patients of ASA PS Ⅰ or Ⅱ receiving total knee arthroplasty with spinal anesthesia were enlisted and randomly allocated into two groups. Group R; bolus injection of 0.375% ropivacaine, 30 ml and an infusion of 0.2% ropivacaine at 8 ml/h (n = 20). Group RF; 0.375% ropivacaine, 29 ml added with 50 μg of fentanyl as a bolus and an infusion of 0.2% ropivacaine mixed with 1 μg/ml of fentanyl at 8 ml/h (n = 20). Local anesthetic infusion via a femoral nerve catheter was started at the end of operation and continued for 48 h. Intravenous patient-controlled analgesia with hydromorphone (0.15 mg/ml, 0-1-10) were used for adjuvant analgesics. Position of catheter tip and contrast distribution, visual analog scale of pain, hydromorphone consumption, side effects were recorded for 48 h after operation. Patient satisfaction for the pain control received were noted. @*Results@#The pain visual analogue scale, incidences of side effects and satisfaction were not different between the two groups (P > 0.05), but the hydromorphone usage at 48 h after operation were lower in the Group RF than in the Group R (P = 0.047). @*Conclusions@#The analgesic effect of ropivacaine with fentanyl for continuous femoral nerve block after knee replacement arthroplasty was not superior to that of the ropivacaine alone.
RESUMEN
Vena cava syndrome is caused by central venous obstruction and can be divided into superior vena cava syndrome and inferior vena cava (IVC) syndrome. Symptoms and signs of IVC syndrome vary from no symptoms to lower limb edema, hypotension, and typical venous stasis changes of the lower extremities, such as brownish discoloration of the skin, woody edema, and ulceration. Carbon dioxide pneumoperitoneum, lithotomy-Trendelenburg position, and abdominal obesity could increase intra-abdominal pressure. We report a patient undergoing laparoscopic surgery who showed intrathoracic herniation of peritoneal fat induced by elevated intra-abdominal pressure due to the reasons mentioned above, resulting in IVC syndrome and hypotension perioperatively. The patient was treated with a conservative approach because he was asymptomatic except for hypotension on the first postoperative day.