Comparison of Bilateral Thoracic Paravertebral Block to Thoracic Epidural Analgesia for Post Operative Analgesia in Patients Undergoing Abdominal Surgery
Pain following abdominal surgery is managed with the use of thoracic epidural analgesia (TEA) where the epidural is inserted in the spine at the level of scapula The risks due to TEA include difficulty with insertion, failure in up to 40% of patient in the perioperative period, fall in blood pressure and a rare devastating complication of paralysis either due to bleeding or infection. Injury to spinal cord is also a feared complication. Therefore alternative techniques need to be evaluated. Paravertebral block (PVB) has been documented to provide pain relief following abdominal surgery using an earlier technique which posed the risk of puncture of the covering to the lung (pleura) resulting in pneumothorax. The current technique involves the use of curled catheters inserted using ultrasonography to lie outside the pleura where the nerves travel thus reducing the chances of pneumothorax and catheter migration. Objective of the current study is to compare the efficacy and safety of bilateral PVB with TEA. Patients undergoing bowel surgery will be randomized to receive thoracic epidural analgesia or bilateral thoracic paravertebral blocks. Pain scores during rest and coughing, failure and complication rates will be compared between the two groups.
The objective of the investigators is to determine whether ultrasound (US)-guided bilateral thoracic paravertebral blocks (PVB) using curled catheter provides effective post-operative analgesia as compared to thoracic epidural analgesia in patients undergoing open abdominal bowel surgeries.
The primary outcome of this study will be the pain scores over the first 24 hours following open bowel surgeries.
Secondary outcomes include
- Analgesic consumption in the perioperative period,
- Block related data (block performance time, success rate, extent of sensory block, complications)
- Hemodynamic parameter every 6 hourly
- Incidence of side effects like nausea and pruritus scores, time to return of bowel activity
Null Hypothesis: Primary.
Paravertebral blocks provide equal analgesia in the early postoperative period (first 24 hours of surgery) as compared to thoracic epidural analgesia in patients undergoing bowel surgeries by laparotomy.
- The analgesic consumption between PVB and TEA is not different during the first 24 hours following surgery
- The block performance time, success rate and extent of sensory block with PVB are not different from that of TEA.
- Side effects and complications following bilateral PVB are not different from those occurring after TEA
Drug: Thoracic epidural analgesia
Procedure: Bilateral Paravertebral block
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||Comparison of Bilateral Thoracic Paravertebral Block to Thoracic Epidural Analgesia for Post Operative Analgesia in Patients Undergoing Abdominal Surgery - A Randomized Open Label Study|
- Postoperative pain scores at rest and on coughing in the first 24 postoperative hours [ Time Frame: From arrival in PACU until 24 hours of arrival in the PACU ]Pain scores at rest and coughing will be documented every 15 minutes for the first 2 hours in PACU and thereafter every 6 hourly until the first 24 hours. Patients may receive intravenous dilaudid boluses in the PACU if the pain scores are greater than 5. patients will be receiving IVPCA or PCEA depending on the group allocation in the PACU. The total dose of narcotic used will be documented.
- total pain scores till 72 hours postoperatively [ Time Frame: from arrival in PACU to 3rd postoperative day (72 hours) ]Pain scores at rest and coughing will be documented every 15 minutes for the first 2 hours in PACU and thereafter every 6 hourly until the block catheters are removed at 72 hours. Patients may receive intravenous dilaudid boluses if the pain scores are greater than 5. The total dose of narcotic used will be documented.
|Study Start Date:||December 2012|
|Study Completion Date:||December 2014|
|Primary Completion Date:||December 2014 (Final data collection date for primary outcome measure)|
Active Comparator: Thoracic epidural analgesia
Group 1 will receive a catheter congruent TEA. The epidural space will be identified using the loss of resistance technique. After a test dose to rule out intravascular and intrathecal placement of the catheterthe initial block will be made with 0.25% bupivacaine 5 mL followed by 3 mL aliquots administered every 5 minutes to establish a block between T8 and T12. An infusion will be started at 8 mL/hour with 0.1 % bupivacaine with 10microgram/mL of dilaudid and continued for 72 hours. Additional nurse administered boluses of 5-10mL of the standard solution will be allowed via the epidural catheter every 6hourly for poor pain control followed by an increase in the basal infusion rate up to a maximum of 14mL/hr. Patients will be allowed to self administer additional boluses of 3mL of the standard infusate every 20minutes (PCEA)
Drug: Thoracic epidural analgesia
Other Name: Thoracic Epidural Anesthesia
Experimental: Bilateral Paravertebral block
Group 2 will have bilateral PVB catheters inserted using the ultrasound with patients prone. A high-frequency linear probe will used to visualize the transverse process, pleura and the internal intercostal membrane. A 17 guage Tuohy needle will be inserted to puncture the internal intercostal membrane. Injection of local anesthetic will push the pleura away, which will be the end point of needle position. A curved pigtail catheter will be inserted and further 5mL of local anesthetic will be injected while observing further movement of pleura. A similar procedure will be done on the contralateral side at the same level. Infusion of 0.2% ropivacaine will be continued for the next 72 hours. They will also receive IVPCA and additional nurse administered boluses of 5-10mL of ropivacaine 0.2% in the PVB every 6 hourly to the side of maximal pain.
|Procedure: Bilateral Paravertebral block|
Show Detailed Description
Please refer to this study by its ClinicalTrials.gov identifier: NCT01735851
|London Health Sciences Centre University Hospital|
|London, Ontario, Canada, N6A 5A5|