The aim of the study is to compare programmed intermittent bolus application and continuous epidural infusion with regard to additionally applied patient-controlled volume of local anesthesia and quality of analgesia.
Usually, patient controlled epidural analgesia (PCEA) is performed with a constant background infusion and patient-controlled bolus applications. An alternative approach is to give boluses at a regular rate for basic medication, instead of the continuous background infusion, maintaining the same amount of medication delivered per hour, (Programmed Intermittent Epidural Bolus injection; PIEB). In both cases, the patient has the option to trigger additional boluses. PIEB has been applied successfully in pain relief for lumbar epidural anesthesia in obstetrics, with better quality of analgesia and less total volume of local anesthetic required. It is assumed that the higher pressure in the epidural space with bolus injection results in a better and more uniform spread of the local anesthetic. In this study the PIEB-mode will be applied in major gynecological and abdominal surgery. In order to address the possibility that the different types of surgery result in different degrees of postoperative pain, the patients are stratified in three groups and randomized within these groups (Wertheim, Whipple, major colon surgery).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
110
Instead of a continuous background infusion of 6ml/h, one bolus injection is performed at the same amount per hour.
Philipps Universität Marburg
Marburg, Germany
Number of additional patient-controlled bolus of ropivacaine 0.2% (consumption in ml)
The patient-controlled bolus function is programmed with 4ml at a lock-out interval of 30min. The number of additional patient-controlled boli will be read off the epidural pump at 6 pm on the day of surgery, 6 pm on the 1st day and 6 pm on the 2nd day
Time frame: Beginning of operation -6 pm on the second postoperative day
quality of analgesia
Measured on a visual analog scale of 0-10 (0="no pain" ; 10= "worst imaginable pain"
Time frame: At 6 pm on the day of surgery, 6 pm on the 1st day and 6 pm on the 2nd day
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