scholarly journals Comparison between two mixtures of lidocaine and bupivacaine for infraclavicular block: a double blind randomized trial

2020 ◽  
Vol 7 (5) ◽  
pp. 1342
Author(s):  
El Kaissi Jaber ◽  
El Moqaddem Amine ◽  
Khalil Mounir ◽  
Kechna Hicham ◽  
Hachimi Moulay Ahmed ◽  
...  
Keyword(s):  
Side Effects ◽  
Randomized Trial ◽  
Upper Limb ◽  
Motor Block ◽  
Sensory Block ◽  
Double Blind ◽  
Upper Limb Surgery ◽  
Group A ◽  
Infraclavicular Block ◽  
Group B

Background: We compare the two mixtures in terms of efficiency, analgesia, and side effects.Methods: 30 patients scheduled for upper limb surgery were randomized in 2 groups. the group A received a mixture of 50% lidocaine 2% and 50% of bupivacaine 0.5% the group B received a mixture of 75% lidocaine 1% and 25% of bupivacaine 0.5%. Volumes, block onset times, blocks duration times, analgesia, and toxicity were compared.Results: The volumes were equals in both groups. Sensory block onset was 5.43 min in the group A versus 6.73 min in the group B, motor block onset was 11.93 for the group A versus 13.46 min for the group B. Sensory block duration was 5.48 hours in the group A versus 4.05 hours for the group B (p=0.037), motor block duration was 7.75 hours for group A versus 5.50 hours for group B (p=0.014). Analgesia levels are equals between the two groups, there was no side effects listed.Conclusions: The use of low concentrated lidocaine and bupivacaine mixture induces an adequate anaesthesia and decreases the duration of motor block with a reduced level of pain and an equal level of analgesia.

scholarly journals Comparison of Intrathecal Fentanyl and Butorphanol as an Adjuvant to Intrathecal Bupivacaine 0.5% in Infraumbilical Surgeries- A Randomised Double Blind Study

2020 ◽  
Author(s):  
Sandip Roy Basunia ◽  
Prosenjit Mukherjee ◽  
Md Bakir Hossain Munshi
Keyword(s):  
Spinal Anaesthesia ◽  
Motor Block ◽  
Controlled Trial ◽  
Sensory Block ◽  
P Value ◽  
Double Blind Study ◽  
Hyperbaric Bupivacaine ◽  
Double Blind ◽  
Group A ◽  
Group B

Introduction: Neuraxial opioids are widely used as adjuvants to local anaesthetic as they improve quality and duration of block. Neuraxial opioids like Butorphanol and Fentanyl allow prolonged analgesia in the postoperative period and faster recovery from spinal anaesthesia. Aim: To compare the safety and efficacy of Butorphanol and Fentanyl combined with bupivacaine for spinal anaesthesia in infraumbilical surgeries. Materials and Methods: The present study was a randomised controlled trial in which 110, ASA I and II patients of either sex who underwent elective infraumbilical surgeries under spinal anaesthesia were selected. Patients were allocated randomly into two groups A (n=55) and B (n=55). Group A (F) received intrathecal 0.5% hyperbaric bupivacaine 12.5 mg (3 mL) with fentanyl 25 microgram (0.5 mL) to make it total 3.5 mL. Group B (B) received intrathecal 0.5% hyperbaric bupivacaine 12.5 mg (3 mL) with butorphanol 250 microgram (0.25 mL) and Normal Saline (NS) 0.25 mL to make it total 3.5 mL. Heart Rate (HR), Systolic and Diastolic Blood Pressure (SBP, DBP), two segment regression time of sensory block, motor block were assessed at preset intervals. Chi-square test or Fischer’s-exact test were used and a p-value ≤0.05 was considered as statistically significant. Results: Mean of two segment sensory regression time of Group A was 41.94±1.73 minutes and Group B was 50.56±4.43 minutes (p<0.0001). Time to onset of motor block in Group A was 5.28±.32 minutes and Group B was 5.27±.32 minutes (p=0.96). Mean duration of motor block in Group A was 81.23±4.87 minutes and Group B was 109.83±2.61 minutes (p<0.0001). Time to rescue analgesic was 289.27±7.37 minutes in Group A and 378.41±10.25 minutes in Group B (p<0.0001). HR, SBP and DBP were comparable among the groups. Conclusion: Intrathecal bupivacaine-butorphanol mixture was clinically better as it provided longer duration of analgesia with lesser incidences of pruritus and nausea/vomiting compared to intrathecal fentanyl-bupivacaine mixture.

scholarly journals A COMPARATIVE STUDY OF CLONIDINE VERSUS NALBUPHINE AS INTRATHECAL ADJUVANTS TO 0.5% HYPERBARIC BUPIVACAINE DURING LOWER ABDOMINAL SURGERIES – A RANDOMIZED DOUBLE BLIND INTERVENTIONAL STUDY.

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
Trishala Jain ◽  
Jaipal .
Keyword(s):  
Motor Block ◽  
Sensory Block ◽  
Double Blind Study ◽  
Hyperbaric Bupivacaine ◽  
Double Blind ◽  
Rescue Analgesia ◽  
Institutional Ethics ◽  
Group A ◽  
Group B ◽  
Intrathecal Clonidine

Background: Regional anesthesia techniques for gynecological procedures are on increasing trends due to their advantage of postoperative analgesia owing to intrathecal adjuvants. The present study was aimed to comparatively evaluate the clinical efficacy of clonidine with nalbuphine when co-administered intrathecally with 0.5% hyperbaric bupivacaine for Lower abdominal surgeries in Gynecology. Methods: With institutional ethics committee clearance No. 193MC/EC/2018, randomized, double blind study was conducted. After obtaining informed written consent total of 84 patients scheduled for lower abdominal surgeries were randomly allocated into two groups: Group A (n=42) - Inj.  3.5 ml Bupivacaine 0.5% + 0.2 ml Clonidine(30µg) intrathecally.  Group B (n=42) - Inj.3.5 ml Bupivacaine 0.5%+0.2 ml Nalbuphine(2mg) intrathecally. The characteristics of sensory and motor block, hemodynamic data, side effects were recorded. Results: The onset of sensory block was earlier in Group B than Group A (3.08±0.52 min vs 4.00±0.54 min, p<0.001 ). The onset of motor block was also earlier in Group B than Group A (7.78±0.80 min vs 8.80±0.95min, p<0.001). The time to first rescue analgesia in patients receiving intrathecal clonidine was significantly delayed than patients receiving intrathecal nalbuphine (284.95 ± 12.93 min vs 211.52 ± 15.92 min, p<0.001). Introperative hemodynamic changes were comparable and none of the patient suffered from respiratory depression except very little cases of shivering which are not significant. Conclusions: Intrathecal clonidine as adjuvant to bupivacaine provided was clinically more effective than nalbuphine for prolonging the duration of analgesia for gynecological procedures. Keywords: Bupivacaine, Clonidine, Lower abdominal surgeries in gynecology, Nalbuphine, Subarachnoid block.

A COMPARISON BETWEEN INTRATHECAL NALBUPHINE VERSUS FENTANYL AS AN ADJUVANT WITH 0.5% HYPERBARIC BUPIVACAINE FOR POSTOPERATIVE ANALGESIA IN PATIENTS UNDERGOING LOWER SEGMENT CESAREAN SECTION

2021 ◽  
Vol 5 (8) ◽  
Author(s):  
Mukesh Choudhary ◽  
Neeti Mahla
Keyword(s):  
Cesarean Section ◽  
Postoperative Analgesia ◽  
Motor Block ◽  
Sensory Block ◽  
Hyperbaric Bupivacaine ◽  
Double Blind ◽  
Lower Segment Cesarean Section ◽  
Group A ◽  
The Mean ◽  
Group B

Background: Subarachnoid block is the preferred anesthesia for cesarean section, being simple to perform and economical with rapid onset. This study aims to compare the postoperative analgesia of intrathecal nalbuphine and fentanyl as adjuvants to bupivacaine in cesarean section. Methods: A prospective, randomized, double?blind, and comparative study was conducted on 120 patients of American Society of Anesthesiologists (ASA) physical status I and II. These patients were randomized into three groups with fifty patients in each group. Group A received 2 ml of 0.5% hyperbaric bupivacaine (10 mg) plus 0.4 ml nalbuphine (0.8 mg), Group B received 2 ml of 0.5% hyperbaric bupivacaine (10 mg) plus 0.4 ml fentanyl (20 ?g), and Group B received 2 ml of 0.5% hyperbaric bupivacaine (10 mg) plus 0.4 ml of normal saline. Results: The mean duration of sensory block was 107.32 ± 5.36 min in Group A, 111.23 ± 4.23 min in Group B, and 85.69 ± 2.31 min in Group C. The mean duration of motor block (time required for motor block to return to Bromage’s Grade 1 from the time of onset of motor block) was 152.02 ± 3.12 min in Group A, 151.69± 2.36 min in Group B, and 122.12 ± 2.32 min in Group C. Conclusion: We concluded that intrathecal nalbuphine prolongs postoperative analgesia maximally and may be used as an alternative to intrathecal fentanyl in cesarean section. Keywords: Nalbuphine, Bupivacaine, Fentanyl.

scholarly journals Isobaric levobupivacaine a better and safer substitute for spinal anaesthesia in patients undergoing prolonged lower abdominal and lower limb surgeries

2018 ◽  
Vol 6 (9) ◽  
pp. 3111
Author(s):  
Wasimul Hoda ◽  
Abhishek Kumar ◽  
Priodarshi Roychoudhury
Keyword(s):  
Spinal Anesthesia ◽  
Spinal Anaesthesia ◽  
Lower Limb ◽  
Motor Block ◽  
Sensory Block ◽  
Double Blind Study ◽  
Double Blind ◽  
Sensory Blockade ◽  
Group A ◽  
Group B

Background: Bupivacaine being the drug of choice for spinal anaesthesia is associated with serious cardiac toxicity. Levobupivacaine and ropivacaine, both being the two S enantiomers of bupivacaine can be a safer alternatives with better cardiovascular safety. Hence, the clinical efficacy of both were assessed and compared in patients undergoing spinal anesthesia.Methods: A prospective randomized controlled double blind study was done in 68 adult posted for elective lower abdominal and lower limb surgeries under spinal anesthesia. They were randomized into 2 groups. About 3ml isobaric levobupivacaine 0.5% (15mg) was given in group A and 3ml isobaric ropivacaine 0.5% (15mg) was given in group B. Onset, duration of sensory and motor blocks, time for maximum sensory and motor block, time for 2 segment sensory regression and haemodynamic parameters were recorded and analyzed.Results: All patients achieved a sensory block of T10 dermatome. Onset of sensory blockade at T10 was similar in both groups, group A (5.71±1.31min) and group B (5.94±1.72min). Time from injection to two dermatomal regression was 129.68±15.54min in group A and 111.38±22.35min in group B. Onset of Bromage score of 1 in group A was 4.68±1.27min and in group B was 6.44±1.64min. The mean duration of motor and complete motor block was prolonged in group A patients (197.74±18.51min, 168.82±17.90 min) as compared to group B (131.88±20.41min, 106.71±10.85min).Conclusions: Isobaric levobupivacaine was found to be a better and safer substitute for spinal anesthesia in patients undergoing prolonged lower abdominal and lower limb surgeries.

scholarly journals Effects of Adding Intrathecal Dexmedetomidine to Hyperbaric Bupivacaine for Saddle Spinal Block in Adults Undergoing Peri-anal Surgeries

2018 ◽  
Vol 16 (1) ◽  
pp. 43-48 ◽  
Author(s):  
Binod Gautam ◽  
Sushila Moktan Lama ◽  
Mona Sharma
Keyword(s):  
Side Effects ◽  
Motor Block ◽  
Sensory Block ◽  
Categorical Variables ◽  
Spinal Block ◽  
Hyperbaric Bupivacaine ◽  
Analgesic Requirement ◽  
First Choice ◽  
Group A ◽  
Group B

Background: Saddle spinal block is the first choice anesthetic technique for adults undergoing peri-anal surgeries. It prevents unnecessary high levels of analgesia and sympathetic block. However, it may not provide prolonged analgesia. This study aims to investigate analgesic effects of dexmedetomidine when added to hyperbaric bupivacaine in saddle spinal block.Methods: Fifty otherwise healthy adults scheduled for uncomplicated peri-anal surgery were randomly allocated into two equal groups in this double-blinded study. Group A received hyperbaric bupivacaine five milligrams; group B received hyperbaric bupivacaine five milligrams plus dexmedetomidine five micrograms intrathecally. Patients remained seated for ten minutes. Time to first analgesic request by patients was the primary end point. Onset and extent of sensory block, and, magnitude and duration of motor block were assessed. Post-operative analgesic consumption and side effects were studied for 24 hours. Student’s t-test for quantitative variables and Chi-square test for categorical variables were used for statistical analysis.Results: Patients in group B had a significantly prolonged duration of analgesia (group B, 501 ± 306 minutes; group A, 284 ± 58 minutes) and significantly reduced analgesic requirement than patients in group A. Sensory block in first sacral dermatome appeared significantly earlier in group B. Peak sensory block, magnitude of motor block, and side effects were not significantly different between groups A and B.Conclusions: Dexmedetomidine as an intrathecal adjuvant to hyperbaric bupivacaine in saddle spinal block prolongs duration of analgesia and decreases analgesic requirement with no added side effects.

scholarly journals A randomized double blind study to compare 1% 2-chloroprocaine and 0.5% hyperbaric bupivacaine in spinal anesthesia for infra-umbilical surgeries

2019 ◽  
pp. 162-167
Author(s):  
Arvind Khare ◽  
Beena Thada ◽  
Devraj Yadav
Keyword(s):  
Spinal Anesthesia ◽  
Motor Block ◽  
Sensory Block ◽  
Double Blind Study ◽  
Hemodynamic Parameters ◽  
Hyperbaric Bupivacaine ◽  
Double Blind ◽  
Voiding Function ◽  
Group A ◽  
Group B

Background: Spinal anesthesia is a reliable and safe technique for infra-umbilical surgeries. Preservative-free 2-chloroprocaine has re-emerged for use in spinal anesthesia. We compared onset and duration of sensory block with intrathecal use of 1% 2-chloroprocaine (30 mg) or 0.5% Hyperbaric Bupivacaine (15 mg) as primary objective. Secondary objectives being onset and duration of motor block, duration of analgesia, time to return of voiding function, hemodynamic parameters and side effects.Methodology: 90 patients of age group 18-60 years, either sex, belonging to ASA physical status I/II undergoing infra-umbilical surgeries were randomly divided into two groups, 1% 2-chloroprocaine Group A (n=45) and 0.5% hyperbaric bupivacaine Group B (n=45). Each group received intrathecally either 30 mg of 2-chloroprocaine or 15 mg of hyperbaric bupivacaine 15 mg. For statistical analysis unpaired-t-test and chi-square test were used.Results: Earlier onset and shorter duration of sensory block were observed in Group A as compared to Group B respectively (p < 0.001). Similarly, onset was earlier and duration of motor block, duration of analgesia and time to return of voiding function were shorter in Group A as compared to Group B respectively (p < 0.001). Hemodynamic parameters (HR, MAP) were comparable in both groups.Conclusion: Intrathecal 1% 2-chloroprocaine 30 mg provides spinal anesthesia of adequate duration for infra-umbilical surgeries with the advantage of earlier onset and faster regression of spinal block resulting in earlier voiding with stable hemodynamics as compared to 0.5% hyperbaric bupivacaine 15 mg.Citation: Khare A, Thada B, Yadav D, Mathur V, Singh M. A randomized double blind study to compare 1% 2-chloroprocaine and 0.5% hyperbaric bupivacaine in spinal anesthesia for infra-umbilical surgeries. Anaesth. pain & intensive care 2019;23(2):162-167

scholarly journals COMPARISION OF ROPIVACAINE AND BUPIVACAINE IN SUPRACLAVICULAR BRACHIAL PLEXSUS BLOCK

2020 ◽  
pp. 17-19
Author(s):  
Prajapati Jigar s ◽  
Alka Shah ◽  
Pujaben barad ◽  
Keta Patel ◽  
Dipesh shah
Keyword(s):  
Upper Limb ◽  
Motor Block ◽  
Tertiary Care ◽  
Residual Effect ◽  
Sensory Block ◽  
Toxic Effects ◽  
Upper Limb Surgery ◽  
Significant Difference ◽  
Duration Of Surgery ◽  
Group B

Background : Regional Anesthesia in the form of supraclavicular approach to the brachial plexus is often used for orthopedic surgeries of the upper limb. It is often used either as an adjuvant to general anesthesia or as the primary anaesthetic. Bupivacaine’s cardiac and central nervous system toxic effects in some patients prompted the researchers to develop new local anesthetic agent with a profile similar to Bupivacaine without considerable toxic effects. One such possible replacement for Bupivacaine was Ropivacaine. However Ropivacaine’s latency of sensory analgesia was approximately two thirds that of Bupivacaine, therefore it was not as effective in promoting prolonged post-operative analgesia. Method : This was a prospective randomized double blinded comparative study on all patients of orthopaedic department affiliated with tertiary care centre who was undergoing upper limb surgery during the study period. Patients with higher ASA grade (3 or 4), with severe morbidity conditions and having allergy to local anaesthetic drugs were excluded from study. A total 60 patients were selected and assigned into two groups randomly (30 in each group).Group A received 20ml of 0.75% of Ropivacaine plus Xylocaine 2% 10 ml while Group B received 20ml of 0.5% of Bupivacaine plus Xylocaine 2% 10 ml by supraclavicular route. Intraoperatively all the vital parameter monitored. At the end of surgery, the residual effect and duration of surgery noted and after shifting of patient to the ward, patients visited for the assessment. Postoperative analgesia assessed by 10 point of visual analogue scale.Results : There was no significant difference regarding age, weight and sex distribution between two groups. The Onset of sensory block of Group R is nearly 7.07+/-0.82 minutes while in Group B it is 7.1+/-0.84 minutes and the Onset of motor block in Group R is 11.23+/-1 minutes while that in group B is 11.2+/-0.99 minutes. The duration of sensory block in Group R is nearly 9.80+/-0.41 hours (548.2 ± 24.62 minutes) while that in Group B is 9.81+/-0.46 hours (589.2 ± 27.74 minutes) and the duration of motor block in Group R is 9.95+/-0.46 hours (534.4 ± 27.65 minutes) while in Group B it is 9.96+/-0.41 hours (596.0 ± 24.70 minutes).Conclusion : Onset of sensory block and onset of motor block in ropivacaine group andbupivacaine group are similar and there are no clinical and statistical differences in the two groups. Duration of sensory and duration of motor blockade in in ropivacaine group and bupivacaine group are similar and there are no clinical and statistical differences in the two groups. No differences are found in in hemodynamic parameters (HR, BP, SPO2) in the two groups. All the patients in two groups were stable hemodynamically during surgery.

scholarly journals A comparative study between the effect of verapamil versus nalbuphine as an adjuvant in supraclavicular brachial plexus block

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Mohammed Ibrahim Khamis ◽  
Ahmed Saeed Mohamed ◽  
Hesham Mohamed El Azazy ◽  
Hala Salah El Ozairy ◽  
Mohamed Moien Mohamed
Keyword(s):  
Comparative Study ◽  
Brachial Plexus ◽  
Normal Saline ◽  
Motor Block ◽  
Brachial Plexus Block ◽  
Sensory Block ◽  
Motor Blockade ◽  
Group A ◽  
Group B ◽  
Plexus Block

Abstract Background Brachial plexus block has substituted general anesthesia in the majority of patients planned for upper limb surgeries as it avoids the undesired effects of the medications used in general anesthesia as well as the stress response associated with airway manipulation. Opioid agonist–antagonists such as nalbuphine are used as adjuvant to improve the anesthetic properties of bupivacaine. Verapamil has an additive effect in brachial plexus blockade in the form of decreasing the consumption of analgesics in the postoperative period with reducing onset time and extending the duration of motor and sensory blockade. The aim of this study is to investigate the adjuvant effect of verapamil versus nalbuphine to 0.5% bupivacaine in brachial plexus block as regards onset, duration of sensory and motor blockade and postoperative analgesic augmentation. The study is randomized, prospective, double-blinded, comparative study where 90 patients subjected to arm, forearm and hand surgeries were randomized into three groups, group A received 30 ml of plain bupivacaine 0.5% plus 2 ml of normal saline, group B received 30 ml of bupivacaine 0.5% plus 2 ml verapamil equivalent to 5 mg, group C received 30 ml of bupivacaine 0.5% plus 10 mg of nalbuphine diluted in 2 ml of normal saline. Results Results of this study showed that group C and group B sensory block time onset was 7.25 ± 1.5 vs. 10.92 ± 3.84 min, P < 0.001 and was shorter than that in group A (13.2 ± 2.66 min). In addition, the motor block onset was (11.10 ± 1.24 vs. 13.50 ± 3.77 min, P < 0.001) shorter than group A (17.16 ± 1.30 min). In group C and group B, sensory block duration was 396 ± 32.17 vs. 355.83 ± 18.48 min, P < 0.001, respectively and was longer than that in group A (321.13 ± 25.08 min). Also, there was prolonged motor block duration in group C and group B recording (338.92 ± 25.2 vs. 302.93 ± 15.24 min, P < 0.001) and was longer than that in group A (280.70 ± 32.35 min). Time of demand of rescue analgesia dose was significantly long in group C and group B (449.53 ± 52.45 vs. 418.13 ± 41.12 min, P < 0.001) and was longer than group A (361.31 ± 21.42 min). Both verapamil and nalbuphine have additive effect to bupivacaine improving the all anesthetic parameters of the block. Conclusion Both drugs produce favorable enhancement of time onset and effective prolongation of duration of sensory and motor blockade and extend the period of postoperative analgesia with superiority to nalbuphine over verapamil.

scholarly journals A COMPARITIVE STUDY BETWEEN EPIDURAL BUTORPHANOL, NALBUPHINE AND FENTANYL FOR POSTOPERATIVE ANALGESIA IN LOWER ABDOMINAL SURGERIES

2017 ◽  
Vol 10 (5) ◽  
pp. 383
Author(s):  
Swarna Banerjee ◽  
Shaswat Kumar Pattnaik
Keyword(s):  
Side Effects ◽  
Demographic Data ◽  
Age Groups ◽  
Study Drug ◽  
Sensory Block ◽  
Lower Abdomen ◽  
Post Operative Pain ◽  
Catheter Group ◽  
Group A ◽  
Group B

Background: Achieving satisfactory post-operative analgesia with neuraxial administration of narcotics has been the subject of much research. The use of epidural opioids had become an increasingly popular technique for management of acute post-operative pain in recent times. This study evaluates post-operative analgesic benefits in patients administered epidural butorphanol, nalbuphine, and fentanyl as adjuvants with local anesthetics postoperatively for surgery under epidural anesthesia.Methods: A total of 75 patients belonging to age groups 18-60 years who were scheduled for surgeries of lower abdomen were randomly divided into groups of 25 each. Epidural technique was adopted for surgery of the lower abdomen for all patients with 0.5% bupivacaine. In the post-operative period, the study drug was given through epidural catheter. Group A received butorphanol 2 mg, Group B received fentanyl 100 μg, and Group C received nalbuphine 10 mg with 0.125% bupivacaine diluted to 10 ml in normal saline each. Onset, duration, quality of analgesia, hemodynamic changes, and side effects – such as sedation, pruritus, nausea, vomiting, respiratory depression, and urinary retention - were recorded and compared.Results: The demographic data were comparable in all three groups. The onset of sensory block was significantly earlier in Group B (fentanyl) than other two groups. Duration was significantly longer in Group A (butorphanol). No serious cardiorespiratory side effects were noted in any of groups.Conclusion: Fentanyl produces the faster onset of analgesia with adverse effects like pruritus. Butorphanol administered epidurally has the advantage of longer duration of analgesia than fentanyl or epidural nalbuphine with side effects such as nausea, vomiting, and sedation.Keywords: Epidural analgesia, Butorphanol, Fentanyl, Nalbuphine.

scholarly journals Intraoperative and Postoperative Analgesia Using Intravenous Opioid, Clonidine and Lignocaine

1994 ◽  
Vol 22 (1) ◽  
pp. 15-21 ◽  
Author(s):  
M. de Kock ◽  
P. Lavandhomme ◽  
J. L. Scholtes
Keyword(s):  
Side Effects ◽  
Postoperative Analgesia ◽  
Randomised Trial ◽  
Skin Incision ◽  
Time Interval ◽  
Colonic Surgery ◽  
Double Blind ◽  
Group A ◽  
Group B ◽  
Group D

The postoperative analgesia afforded after colonic surgery by IV opioid, clonidine and lignocaine given intra- and postoperatively was evaluated. In a double-blind randomised trial, 80 male patients scheduled for colonic resection under general anaesthesia received fentany 15 μg.kg−1 at induction and another 4 μg.kg−1 before skin incision (group A) or fentanyl (same dose) plus clonidine 4 μg.kg−1 in 20 min + 2 μg.kg−1.h−1 (group B, C) or fentanyl plus clonidine (same dosage) plus lignocaine 2 mg.kg−1 before skin incision, repeated before peritoneal incision and retractor placement (group D). In the four groups, intraoperative boluses of fentanyl 2 μg.kg−1 were given in response to the painful stimulation of the procedure. Postoperative pain was managed with PCA delivering 2 mg morphine per request in group A, 1.5 mg morphine in group B, 1.5 mg morphine + 15 μg clonidine in group C and 1.2 mg morphine + 15 μg clonidine + 23 mg lignocaine in group D. Postoperative analgesia was assessed by recording the analgesic demands (met and unmet) and the dose of morphine delivered at 6, 12, 18, 24, 36 hours. Side-effects, pain and sedation analogue scores were also recorded. A nalgesic demands and delivered morphine dose were reduced, at any time interval considered, in groups B, C, D, compared with A (P <0.001). No differences were noted between the groups B, C, D. Pain analogue scores were better in groups B, C, D compared with group A (P <0.001). Sedation and side-effects were not increased in groups B, C, D. Intraoperative clonidine was the major determinant of the reduction in analgesic demands and morphine delivered. Lignocaine, at the dose used, failed to afford any additional benefit.

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