Postoperatively , patients were discharged home with both oral analgesics and a portable infusion pump delivering 0.2 % ropivacaine ( 500-ml reservoir ) in one of three dosing regimens : the basal group ( 12 ml/h basal , 0.05-ml patient-controlled bolus dose ) , the basal-bolus group ( 8 ml/h basal , 4 ml bolus ) , or the bolus group ( 0.3 ml/h basal , 9.9 ml bolus ) .
