Fentanyl does not improve the nerve block characteristics of axillary brachial plexus anaesthesia performed with ropivacaine

BACKGROUND: The aim of this prospective, randomized, double-blind study was to evaluate the effects of adding 1 microg. kg-1 fentanyl to ropivacaine 7.5 mg. ml-1 for axillary brachial plexus anaesthesia. METHODS: With Ethics Committee approval and written consent, 30 ASA physical status I-II in-patients, scheduled for orthopaedic hand procedures were randomly allocated to receive axillary brachial plexus block with 20 ml of either ropivacaine 7.5 mg. ml-1 (n=15) or ropivacaine 7.5 mg. ml-1+1 microg. ml-1 fentanyl (n=15). Nerve blocks were placed using a nerve stimulator with the multiple injection technique. A blinded observer recorded the time to onset of surgical block (loss of pinprick sensation in the innervation areas of the hand (C6-C8) with concomitant inability to flex the wrist against gravity and move the fingers when squeezing the hand) and first request for pain medication after surgery. RESULTS: No differences in demography, degree of sedation or peripheral oxygen saturation were observed between the two groups. Median (range) time required to achieve readiness for surgery was 15 min (5-36 min) with ropivacaine alone and 15 min (5-40 min) with the ropivacaine-fentanyl mixture. No differences in the intraoperative quality of nerve block were reported between the two groups. Four patients receiving ropivacaine plain and two patients receiving the ropivacaine-fentanyl mixture did not require analgesics during the first 24 h after surgery (P=0.62). The degree of pain experienced at first analgesic request in those patients asking for pain medication, as well as median consumption of postoperative analgesics, were similar in the two groups. First postoperative analgesic request was made at 11 h (25th-75th percentiles: 9.1-14 h) in patients receiving ropivacaine alone and at 11.8 h (25th-75th percentiles: 9.8-15 h) in patients receiving the ropivacaine-fentanyl mixture (P=0.99). CONCLUSION: The addition of fentanyl 1 microg. ml-1 to ropivacaine 7.5 mg. ml-1 does not improve the nerve block characteristics of axillary brachial plexus anaesthesia for orthopaedic procedures involving the hand.     

Combined sciatic-femoral nerve block with 0.75% ropivacaine: effects of adding a systemically inactive dose of fentanyl

To evaluate the effects of adding low-dose fentanyl to 0.75% ropivacaine during peripheral nerve blocks, 30 ASA physical status I-II patients undergoing hallux valgus repair under combined sciatic-femoral nerve block were randomly allocated in a double-blind fashion to receive nerve block placement with 30 mL of either 0.75% ropivacaine alone (group: ropivacaine, n = 15) or 0.75% ropivacaine plus fentanyl 1 microg kg(-1) (group: ropivacaine-fentanyl, n = 15). A blinded observer recorded haemodynamic variables and sedation, as well as the time required to achieve surgical block and the first request for analgesia. Readiness to surgery required 10 min (5-20 min) with 0.75% ropivacaine and 10 min (3-20 min) with the ropivacaine-fentanyl mixture. No differences in the degree of sedation, peripheral oxygen saturation, and haemodynamic variables were observed between the two groups. The degree of pain measured at first analgesic request, and the consumption of postoperative analgesics, was similar in the two groups, while the mean time from block placement to the first request for pain medication was 13.7 h (25-75th percentiles: 11.8-14.5 h) in the ropivacaine group and 13.9 h (25-75th percentiles: 10.5-14.5 h) in the ropivacaine-fentanyl group (P = not significant). We conclude that adding fentanyl 1 microg kg(-1) to 0.75% ropivacaine did not provide clinically relevant advantages in terms of onset time, quality and duration of combined sciatic-femoral nerve block in patients undergoing elective hallux valgus repair.     

Clonidine prolongs the effect of ropivacaine for axillary brachial plexus blockade

PURPOSE: To evaluate the effect of adding clonidine to ropivacaine, for axillary brachial plexus blockade, on the onset and duration of sensory and motor block and duration of analgesia. METHODS: In a prospective randomised double blind placebo controlled study axillary brachial plexus blockade was performed in 50 patients using 40 ml ropivacaine 0.75%. Group (A) had 150 microg clonidine and Group (B) 1 ml normal saline added to the local anesthetic. Sensory function was tested using pinprick (sharp sensation, blunt sensation or no sensation) and temperature with an ice cube compared with the opposite arm, (cold/not cold). Motor function was assessed using a modified Bromage scale. Postoperative analgesia was standardised. Onset and duration of sensory and motor blockade, duration of analgesia, postoperative pain score, and analgesic requirement were compared. RESULTS: The clonidine patients showed an increase in duration of sensory loss from 489 min to 628 min with a mean difference of 138 min (95% confidence interval of 90 to 187 min), motor blockade from 552 min to 721 min with a mean difference of 170 min (95% confidence interval of 117 to 222 min), and analgesia from 587 min to 828 min with mean difference of 241 min (95% confidence interval of 188 to 294 min). There was no difference in onset time. No side effects were noted. CONCLUSION: The addition of 150 microg of clonidine to ropivacaine, for brachial plexus blockade, prolongs motor and sensory block and analgesia, without an increased incidence of side effects.     

Does clonidine 50 μg improve cervical plexus block obtained with ropivacaine 150 mg for carotid endarterectomy? A randomized,double-blinded study

STUDY OBJECTIVE: To evaluate the effects of adding 50 microg clonidine to 150 mg ropivacaine for superficial cervical plexus block in patients undergoing elective carotid endarterectomy (TEA). DESIGN: Randomized, double-blind study. SETTING: Departments of Anesthesia and Vascular Surgery of a university hospital. PATIENTS: 40 ASA physical status II and III patients undergoing elective TEA during superficial cervical plexus block. INTERVENTIONS: Superficial cervical plexus block was placed using 20 mL of 0.75% ropivacaine alone (Ropi group, n = 20) or with the addition of 50 microg clonidine (Ropi-Clonidine group, n = 20). If required, analgesic supplementation was given with local infiltration with 1% lidocaine and intravenous fentanyl (50-microg boluses). Nerve block profile, need for intraoperative analgesic supplementation, and time to first analgesic request were recorded. MEASUREMENTS AND MAIN RESULTS: Median (range) onset time was 10 minutes (5-25 min) in the Ropi group and 5 minutes (5-20 min) in the Ropi-Clonidine group (P < 0.05). Intraoperative consumption of both 1% lidocaine and fentanyl was higher in patients of the Ropi group (15 mL [0-25 mL] and 250 microg [50-300 microg]) than in patients of the Ropi-Clonidine group (8 mL [0-20 mL] and 0 microg [0-150 microg]; P < 0.05 and P < 0.05, respectively). First postoperative analgesic request occurred after 17 hours (10-24 hrs) in the Ropi group and 20 hours (10-24 hrs) in the Ropi-Clonidine group (P > 0.05). CONCLUSIONS: Adding 50 microg clonidine to 150 mg ropivacaine for superficial cervical plexus block shortened the onset time and improved the quality of surgical anesthesia in patients undergoing elective TEA.     

A clinical comparison of ropivacaine 0.75%, ropivacaine 1% or bupivacaine 0.5% for interscalene brachial plexus anaesthesia

In order to compare interscalene brachial plexus block performed with ropivacaine or bupivacaine, 45 healthy, unpremedicated patients, undergoing elective shoulder surgery, were randomly allocated to receive interscalene brachial plexus anaesthesia with 20 mL of either ropivacaine 0.75% (n = 15), ropivacaine 1% (n = 15), or bupivacaine 0.5% (n = 15). Readiness for surgery (loss of pinprick sensation from C4 to C7 and inability to elevate the limb from the bed) was achieved later with bupivacaine 0.5% (28 +/- 15 min) than with ropivacaine 1% (10 +/- 5 min) (P = 0.005) and ropivacaine 0.75% (15 +/- 8 min) (P = 0.0005). No differences in success rate were observed between the three groups; however, seven patients receiving bupivacaine 0.5% required intra-operative analgesic supplementation (fentanyl 0.1 mg intravenous) compared with one patient receiving ropivacaine 0.75%, and two patients treated with ropivacaine 1% (P = 0.02). The time from the block placement to first request for pain medication was similar in the three groups (10.7 +/- 2 h, 11 +/- 2.4 h, and 10.9 +/- 3.9 h after 0.75% and 1% ropivacaine or 0.5% bupivacaine, respectively). We conclude that interscalene brachial plexus block performed with 20 mL of either 0.75% or 1% ropivacaine allows for a prolonged post-operative pain relief, similar to that provided by bupivacaine 0.5%, with short onset time of surgical anaesthesia.     

Clonidine administered as an axillary block does not affect postoperative pain when given as the sole analgesic.

Used as the sole analgesic, clonidine produces analgesia after epidural, intrathecal, and intraarticular administration. We conducted this double-blinded study to determine whether clonidine has analgesic effects when administered into the brachial plexus sheath. At the conclusion of hand or forearm surgery, performed under axillary brachial plexus block, 45 patients were randomly divided into three groups of 15 each to receive, through an axillary catheter, 15 mL of saline (Group Saline), clonidine 150 microg in 15 mL of saline (Group Clonidine), or bupivacaine 15 mL (Group Bupivacaine). The analgesic effects of the three solutions were evaluated for 6 h. Times to onset of pain and to first analgesic request were longer, and the total dose of pain medication was smaller in Group Bupivacaine compared with the other groups. Visual analog scores were significantly lower in Group Bupivacaine. There was no significant difference in time to onset of pain, time to first analgesic request, total dose of pain medication, and visual analog scores between Group Saline and Group Clonidine at any time. We conclude that the administration of clonidine 150 microg into the brachial plexus sheath does not prolong the onset of postoperative pain. IMPLICATIONS: Used as the sole analgesic, clonidine produces analgesia after epidural, intrathecal, and intraarticular administration. It also prolongs the analgesic effect of brachial plexus block when mixed with local anesthetics. In this study, the administration of clonidine 150 microg alone into the brachial plexus sheath did not produce postoperative analgesia.     

The effects of clonidine on ropivacaine 0.75% in axillary perivascular brachial plexus block

INTRODUCTION: The new long-acting local anesthetic ropivacaine is a chemical congener of bupivacaine and mepivacaine. The admixture of clonidine to local anesthetics in peripheral nerve block has been reported to result in a prolonged block. The aim of the present study was to evaluate the effects of clonidine added to ropivacaine on onset, duration and quality of brachial plexus block. METHODS: Patients were randomly allocated into two groups. In group I brachial plexus was performed using 40 ml of ropivacaine 0.75% plus 1 ml of NaCL 0.9%, and in group II brachial plexus was performed using 40 ml of ropivacaine 0.75% plus 1 ml (0.150 mg) of clonidine. Onset of sensory and motor block of radial, ulnar, median and musculocutaneous nerve were recorded. Motor block was evaluated by quantification of muscle force, according to a rating scale from 6 (normal contraction force) to 0 (complete paralysis). Sensory block was evaluated by testing response to a pinprick in the associated innervation areas. Finally, the duration of the sensory block was registered. Data were expressed in mean+/-SD. For statistical analysis a Student t-test was used. A P-value of < or = 0.05 was considered as statistically significant. RESULTS: The duration of blockade was without significant difference between the groups. Group I: 718+/-90 min; Group II: 727+/-117 min. There was no intergroup difference in sensory and motor onset or in quality of blockade. CONCLUSION: The addition of clonidine to ropivacaine 0.75% does not lead to any advantage of block of the brachial plexus when compared with pure ropivacaine 0.75%.     

Comparison of the effects of clonidine and ketamine added to ropivacaine on stress hormone levels and the duration of caudal analgesia

BACKGROUND: The purpose of this study was to compare the analgesic quality and duration of ropivacaine 0.2% with the addition of clonidine (1 microg.kg(-1)) with that of ropivacaine 0.2% and the addition of ketamine (0.5 mg.kg(-1)) to that of ropivacaine 0.2% and also compare the postoperative cortisol, insulin and glucose concentrations, sampled after induction and 1 h later following caudal administration in children. METHODS: According to the randomization, patients in the ropivacaine group (R; n = 25) received ropivacaine 0.2%, 0.75 ml.kg(-1); those in the clonidine group (RC; n = 25) received ropivacaine 0.2% 0.75 ml.kg(-1) plus clonidine 1 microg.kg(-1) and those in the ketamine/ropivacaine group (RK; n = 25) ropivacaine 0.2% 0.75 ml.kg(-1) plus ketamine 0.5 mg.kg(-1) (10 mg.ml(-1) concentration). Drugs were diluted in 0.9% saline (0.75 ml.kg(-1)) and prepared by a staff anesthesiologist not otherwise involved in the study. In all groups, the duration of analgesia, analgesic requirements, sedation and insulin, glucose, cortisol concentrations were recorded and statistically compared. RESULTS: There were no significant differences among the three study groups with respect to age, weight or duration of surgery. Caudal administration of clonidine 1 microg.kg(-1) or ketamine 0.5 mg.kg(-1) induced a longer duration of analgesia (P < 0.05) compared with ropivacaine alone. Insulin levels were increased and cortisol reduced in all groups. Glucose concentration was increased in all groups and statistically significant (P < 0.05). CONCLUSIONS: Addition of ketamine and clonidine to ropivacaine 0.2% 0.75 ml.kg(-1), when administered caudally in children, prolongs the duration of postoperative analgesia. The need for subsequent postoperative analgesic is also reduced. Caudal analgesia attenuates or allows partial changes to postoperative cortisol, insulin or blood glucose responses to surgery.     

Comparison of 0.2% ropivacaine and 0.25% bupivacaine for axillary brachial plexus blocks in paediatric hand surgery

BACKGROUND: The purpose of this study was to compare the use of ropivacaine 0.2% with bupivacaine 0.25% for axillary brachial plexus block in children undergoing hand surgery. METHODS: In a double-blind, randomized study, 35 children undergoing hand surgery received axillary brachial plexus blocks with 0.5 ml.kg-1 of either 0.2% ropivacaine or 0.25% bupivacaine. Pain scores were noted at 0, 3, 6, 12 and 24 h after surgery. The time to first dose of codeine phosphate and the total doses of all analgesics given were recorded. RESULTS: There was no significant difference between the two groups in pain scores, the time to first dose of codeine phosphate or in analgesic requirements in the first 24 h. CONCLUSIONS: Ropivacaine 0.2% is as effective as bupivacaine 0.25% for axillary brachial plexus blocks in children undergoing hand surgery.     

Comparative study of different concentrations of prilocaine and ropivacaine for intraoperative axillary brachial plexus block

BACKGROUND AND OBJECTIVE: To compare the anaesthetic characteristics in terms of onset and offset times of the sensory and motor blocks of prilocaine 1% and ropivacaine 0.75% alone and in different combinations when used for brachial plexus anaesthesia in axillary perivascular blocks. METHODS: After informed consent 96 ASA I-III patients undergoing forearm or hand surgery participated in this prospective, randomized, double-blind study. Patients received either prilocaine 1% 40 mL (G1), prilocaine 1% 30 mL and ropivacaine 0.75% 10 mL (G2), prilocaine 1% 20 mL and ropivacaine 0.75% 20 mL (G3) or ropivacaine 0.75% 40 mL (G4) for axillary perivascular brachial plexus anaesthesia. Onset and duration of sensory and motor blocks in the distribution of the musculocutaneous, radial, median and ulnar nerves were assessed. RESULTS: The onset time of the sensory and motor blocks of the whole brachial plexus differed only between patients in G4 with ropivacaine 0.75% 40 mL demonstrating a later motor onset in comparison to all other groups and a later sensory onset in comparison to G1 and G2 (P < 0.01). The addition of ropivacaine resulted in longer offset times of the sensory and motor blocks. The median offset time of the motor block was 179.5 min in G1, 262 min in G2, 389.5 min in G3 and 745 min in G4 (P < 0.01). The median offset time of the sensory block was 163.5 min in G1, 277 min in G2, 383.5 min in G3 and 784 min in G4 (P < 0.01). There was no difference in onset and offset times between sensory and motor blocks within the groups. CONCLUSIONS: For axillary perivascular brachial plexus block prilocaine 1% alone and in combination with ropivacaine 0.75% was similar in terms of onset of sensory and motor blocks but different in duration of sensory and motor blocks without a differential sensory and motor offset.     

0.75% and 0.5% ropivacaine for axillary brachial plexus block: a clinical comparison with 0.5% bupivacaine

BACKGROUND AND OBJECTIVES: Although ropivacaine has been extensively studied for epidural anesthesia, very few reports exist on brachial plexus block. We therefore decided to investigate the clinical features of axillary brachial plexus anesthesia with two different concentrations of ropivacaine (0.5% and 0.75%) and to compare the results with those obtained with 0.5% bupivacaine. METHODS: Three groups of patients were randomized and prospectively studied. They received, in a double-blind fashion, 32 mL of the local anesthetic solution into the midaxilla, by a nerve-stimulator technique. Onset time in each of the stimulated nerves was recorded both for the sensory and motor block. Peak time (ready to surgery), rate of supplemental blocks, need for intraoperative opioids, duration of sensory and motor block, postoperative analgesic requirements, and patient satisfaction were also recorded. RESULTS: The rate of complete sensory and motor block observed with both ropivacaine groups was higher at 10, 15, and 20 minutes postinjection (P < .001). The mean peak time was shorter with ropivacaine than with bupivacaine (R50 = 16.37 minutes, R75 = 14.7 minutes, B = 22.3 minutes, P < .05). The quality of the anesthesia was higher with ropivacaine, as measured by the intraoperative needs for opioids and the overall patient's satisfaction (P < .05). No significant differences were noted with all the other studied parameters. CONCLUSION: Ropivacaine showed advantages over bupivacaine for axillary brachial plexus block. Because no statistical differences were found between the two ropivacaine groups, we therefore conclude that 0.75% does not add benefit and that 0.5% ropivacaine should be used to perform axillary brachial plexus blocks.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

Clonidine does not improve quality of ropivacaine axillary brachial plexus block in children

Background: The addition of clonidine to peripheral nerve blocks is controversial in children. Objective: The aim of our study was to evaluate the effect of clonidine added to ropivacaine in pediatric axillary brachial plexus block (ABPB). Methods: Children aged 1–6 years, scheduled to undergo forearm or hand surgery, were recruited into this prospective, double‐blind controlled trial. Patients were randomly allocated to receive an ABPB either with ropivacaine 0.2% 0.4 ml·kg^?1 plus saline in 1 ml (RS) or ropivacaine 0.2% 0.4 ml·kg^?1 plus clonidine 1 μg·kg^?1 in 1 ml (RC). Primary endpoints were quality of postoperative analgesia as assessed by pain scores and total 24‐h postoperative analgesia requirements. Secondary outcomes were time to first analgesia request and duration of motor blockade. Results: Sixty patients were recruited (n = 30 per group) into the study. Pain scores were comparable throughout the first 24 h between the two groups. Ten children in the (RS) and six in (RC) groups required supplementary analgesia during the first 24 h (P = 0.24). Children who required further analgesia did so after 288 ± 94 min in the (RS) and 437 ± 204 min in the (RC) group (P = 0.06). There was no difference in the duration of motor block [186 ± 71 and 154 ± 56 min, P = 0.12 for (RS) and (RC), respectively]. Conclusion: Ropivacaine (0.2% 0.4 ml·kg^?1) for ABPB provides sufficient postoperative analgesia in children scheduled for forearm or hand surgery. The addition of clonidine to ABPB does not improve overall postoperative analgesia but may increase the time to first analgesia request.     

Adiuvants in the axillary brachial plexus blockade. Comparison between clonidine, sufentanil and tramadol

BACKGROUND: Evaluated effects of tramadol used as adiuvant in brachial plexus block and compared with clonidine and sufentanil. METHODS: Randomized, prospectic study with 80 patients, ASA status I-II, undergoing carpal tunnel release performed under axillary plexus block with ropivacaine 0.75% 20 ml divided in 4 study groups: tramadolo 100 mg (Group T), clonidina 1.5 g/kg (Group C), sufentanil 20 g (Group S) in 5 ml. of NaCl. Control (Group F) NaCl 5 ml. Adeguacy of the block was evaluated using pinprick test ( three points scale) and a temperature test. Onset time, duration of analgesia and anesthesia were recorded. Also during the surgery the sedation score on a five-point scale was evaluated and were recorded episodes of hypotension, bradycardia, Sp02<90% and other side effects. Results are reported as median+/-SD. For statistical analysis ANOVA test, Bonferroni test and c2 test were used. RESULTS: Onset time of anesthesia showed significant difference between three study groups than control group, while no significant differences was recordered between groups S, C and T (S: 11+/-7 min; C: 12+/-4 min; T: 14+/-8 min; F: 20+/-11 min.). Same results were obtained among duration of anesthesia and analgesia, that were lower in F group. An adeguate quality of block for surgery was obtained in 79 patients. Only one patients of F group needed surgical infiltration. A significant difference was recordered among quality of anesthesia between group F and other three study groups. Highest sedation score was noted in C and S groups. Significantly highest incidence of bradycardia and hypotension episodes were observed in group C. CONCLUSIONS: The use of tramadol as adiuvant provides a significative redution of onset time. Also provides a prolongation of anesthesia and analgesia with a quality of block similar that obtained with clonidine and sufentanil and a lower incidence of side effects of clonidine (sedation, bradycardia and hypotension) and sufentanil(itch and sedation). We conclude that tramadol may be a useful alternative, as adiuvant in periferic block, with same effects of other drugs commonly used and a lower incidence of side effects.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.     

臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系

目的 评价臂丛神经阻滞时神经刺激器诱发患者不同运动反应与桡神经阻滞效果的关系.方法 择期拟行手、腕或前臂手术患者120例,性别不限,ASA I或Ⅱ级,年龄18～60岁,随机分为2组(n=60),三点腋路臂丛神经阻滞在周围神经刺激器引导下,采用1%利多卡因与0.33%罗哌卡因混合液注射于肌皮神经、正中神经,分别为5、10 ml,I组和Ⅱ组分别诱发前臂外展或腕及手指外展时,采用上述混合液20 ml注射于桡神经周围,于注射完毕后5、10、15、20、25和30 min时采用针刺法评价肌皮神经、正中神经的感觉阻滞情况,桡神经近端和远端的感觉及运动阻滞情况.记录神经阻滞操作时间,记录桡神经定位次数,评价桡神经定位的难易程度.结果 与I组相比,Ⅱ组感觉完全阻滞成功率高,桡神经远端感觉及运动阻滞成功率高,神经阻滞操作时间长,桡神经定位困难程度高(P<0.05或0.01).结论 臂丛神经阻滞时,当神经刺激器诱发患者腕及手指外展较诱发前臂外展应用1%利多卡因与0.33%罗哌卡因混合液20 ml阻滞桡神经的效果更完善.