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Query: UMLS:C0344307 (analgesia)
 28,200 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Continuous epidural anesthesia (CEA) is generally accepted as a routine method of regional anesthesia while there has been only limited application of continuous spinal anesthesia (CSA), due mainly to a lack of adequate spinal catheters. With the introduction of a new, ultra-thin spinal catheter (32 G) inserted via a thin puncture needle, some of the complications reported after CSA can be eliminated. We studied CSA versus CEA in lower-extremity operations. METHODS. We evaluated 33 patients in a prospective, randomized study. All were comparable with respect to age, anesthetic risk (ASA II-III), and pre-existing diseases. The only exclusion criterium was the presence of a coagulation disturbance. The CSA group consisted of 17 patients (mean age 75.5 +/- 0.1 year); 26 G puncture needle and 32 G catheter were used. The CEA group consisted of 16 patients (mean age 73.8 +/- 11.0 years); an 18 G puncture needle and 22 G epidural catheter with a stylet were inserted with the loss-of-resistance technique. Both catheters were placed with the patient in a sitting position and left in place for 24 h in order to administer local anesthetics (LA) for postoperative analgesia as required. Hemodynamic parameters-mean arterial pressure (MAP) and heart rate (HR)-were compared in each group at 5-min intervals for 30 min after administration of local anesthetic and at 10-min intervals during the operation. Additionally, the ECG, pulse oximetry, respiratory rate, diuresis, and blood gases were monitored. After placement of the catheter, patients in the CSA group received 1.9 ml (+/- 0.2) bupivacaine HCl 0.5%. Patients in the CEA group received 12.6 ml (+/- 2.5) bupivacaine HCl 0.5%. For statistical evaluation of the data we used mean values, standard deviation (+/-), the Kruscal-Wallis procedure, and Student's t-test for unpaired data. P less than 0.05 was considered significant. RESULTS. The mAPs in the CSA group generally remained lower than those of the CEA group. However, over the course of the operation as well as after repeated injections, the difference between the two groups decreased. Only at 5 min after administration of the initial dose was a statistically significant difference in blood pressures between the two groups observed. A clinically relevant, rapid decrease in blood pressure due to relatively high doses of LA was seen in 1 case in each group. The first reinjection of LA after the initial dose was after 1.9 h in the CSA group (bupivacaine HCl 0.5% 1 +/- 0.3 ml) and after 1.8 h in the CEA group (bupivacaine HCl 0.5% 4.5 +/- 1 ml). The total dose of bupivacaine in the CSA group was 0.18 ml/kg per hour versus 0.8 ml/kg in the CEA group. No post-dural puncture headache was observed in the CSA group. DISCUSSION. The catheter designed for CSA is easy to use, although because of its small diameter a certain manual dexterity is required. In addition, CSA resulted in a more rapid onset of action and more pronounced sensorimotor blockade than did CEA. Hemodynamic alterations and side effects were comparably low in both groups.
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PMID:[Continuous spinal anesthesia versus continuous epidural anesthesia in surgery of the lower extremities. A prospective randomized study]. 182 99

The purpose of this retrospective study was to evaluate the combined use of intravenous analgesia, with a potent opiate alone, supplemented by local anaesthesia as an alternative to general anaesthesia for medically compromised patients. Sixty-two in-patients, aged between 32 and 80 years, with an ASA physical status of III and IV, were involved in this study. The local anesthetic used was 4% articain with epinephrine (1:200,000) and narcotic analgesics were Fentanyl or Alfentanil. Surgical procedures included multiple dental extractions, cystectomy and the removal of impacted teeth. All patients completed the surgery without deeper anaesthesia and mostly enjoyed a comfortable intraoperative period. Only one respiratory depression was observed, but quickly reversed. Other adverse effects were few and without consequences, hemodynamic changes remained in tolerable limits. In conclusion this anaesthetic technique can be a suitable alternative to general anaesthesia in oral surgery for high-risk patients.
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PMID:Local anaesthesia with intravenous analgesia as an alternative to general anaesthesia for medically compromised patients undergoing oral surgery. A retrospective study of sixty-two cases. 183 35

We compared the postoperative epidural analgesia provided by the continuous epidural infusion of bupivacaine supplemented with patient-controlled injection (PCA) of epidural fentanyl with that provided by a continuous infusion of bupivacaine supplemented with a continuous epidural infusion of fentanyl. Our patient population comprised 16 ASA physical status I or II patients undergoing laparotomy with a midline incision under general anesthesia combined with bupivacaine epidural analgesia. Post-operatively, a continuous epidural infusion of bupivacaine (0.1 mg.kg-1.h-1) was combined with epidural fentanyl given by either (a) PCA (15-micrograms bolus with a lockout interval of 12 min, n = 8) or (b) continuous infusion (1 microgram.kg-1.h-1, n = 8). In the case of inadequate pain relief in the latter group, the fentanyl infusion rate was increased by 10 micrograms/h. Analgesia evaluated by a visual analogue pain score and by a verbal pain score was similarly effective in both groups. The sedation score was also similar in both groups. The total dose of epidural fentanyl administered during the first 24 h was significantly lower in the PCA group than in the continuous infusion group (405 +/- 110 micrograms vs 1600 +/- 245 micrograms, P less than 0.001). The dose of fentanyl given during each 4-h interval ranged between 40 and 160 micrograms in the PCA group and 251 and 292 micrograms in the continuous infusion group. Clinically detectable respiratory depression was not observed in either group. In conclusion, epidural administration of 0.1 mg.kg-1.h-1 bupivacaine combined with fentanyl provides effective postoperative analgesia with a total dose of fentanyl required that is lower when fentanyl is administered by epidural PCA rather than by continuous epidural infusion.
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PMID:Comparison of continuous epidural bupivacaine infusion plus either continuous epidural infusion or patient-controlled epidural injection of fentanyl for postoperative analgesia. 185 27

The efficacy of intravenous (iv) and epidural infusions of alfentanil for postoperative pain relief was investigated in 24 patients (ASA physical status 1-2) who were scheduled for abdominal hysterectomy. The patients were allocated randomly to receive either epidural or iv alfentanil. In both groups, a loading dose of 15 micrograms.kg-1 was administered, followed by a constant rate infusion of 18 micrograms.kg-1.h-1 alfentanil for 20 h. Both routes provided similar degrees of analgesia; however, analgesia occurred earlier in the intravenously treated group (P less than 0.03). Mean plasma alfentanil concentrations (Cps) varied between 42 and 82 ng.ml-1 in the iv group and 23 and 68 ng.ml-1 in the epidural group, with higher concentrations in the iv group for the first 60 min only (P less than 0.01). Cps increased with infusion time, suggesting accumulation of alfentanil. After infusion ended, pain recurred at the same time in both groups, whereas the alfentanil Cps still were greater than 45 ng/ml. Postoperative epinephrine concentrations decreased after 60 min of infusion (P less than 0.02), whereas, after 6 h, cortisol levels decreased to preoperative values. Norepinephrine concentrations decreased only slightly. The only clinically meaningful effect on vital signs that occurred was an abrupt reduction of respiratory rate after the iv loading dose. PaCO2 increased to the same extent in both groups during the first 15 min only. The incidence of opioid-related side effects was similar in both groups. These results suggest that the iv and epidural routes were equally effective for providing postoperative pain control and controlling the postoperative response to surgical stress.
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PMID:Alfentanil infusion for postoperative pain: a comparison of epidural and intravenous routes. 173 10

The quality of sedation and postoperative recovery have been assessed for intra-operative sedation provided by either patient-controlled sedation with propofol or a standard method using divided doses of midazolam and fentanyl, in 40 ASA 1 day surgery patients undergoing extraction of third molar teeth under local analgesia. Patient-controlled sedation with propofol produced sedation no deeper than full eyelid closure with prompt response to verbal command, but deeper levels were seen in three patients in the midazolam and fentanyl group. Patient satisfaction was higher in the patient-controlled sedation propofol group for both subjective intra-operative feelings (p less than 0.01) and willingness to have the procedure again in the same manner (p less than 0.05). Amnesia was more limited to intra-operative events (rather than extending into the postoperative period) in the patient-controlled sedation propofol group (p less than 0.05). Drug dose was correlated with duration of procedure and surgical difficulty in the patient-controlled sedation propofol group but not in the midazolam and fentanyl group. Postoperative testing included a new computerised test, the FAST index, which indicated a dose-dependent reduction in cognitive function in the midazolam and fentanyl group, which persisted until the time of discharge. Changes in cognitive function in the patient-controlled sedation propofol group in the same postoperative interval were significantly less and not related to propofol dose.
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PMID:Intra-operative patient-controlled sedation. Comparison of patient-controlled propofol with anaesthetist-administered midazolam and fentanyl. 186 94

The possible potentiating effect of phentanyl on mepivacaine in brachial plexus blockade was evaluated, both for operative anesthesia and postoperative analgesia. Sixty ASA I patients, scheduled for upper limb surgery, were selected and distributed in 3 groups: 1) Mepivacaine 1% 40 ml (control group); 2) Mepivacaine 1% 40 ml + phentanyl 100 micrograms; 3) Mepivacaine 1% 40 ml + subcutaneous phentanyl 100 micrograms. The latency time and the quality of anesthesia were evaluated. The duration of analgesia was evaluated on the basis of the time from the administration of the first analgesic. There were no significant differences between the 3 groups in the latency times of the development of blockade nor in the quality of surgical anesthesia. Also, there were no significant differences in the duration of postoperative analgesia (307, 316 and 326 minutes, respectively, in each group). It was concluded that the addition of phentanyl 100 micrograms to the local anesthetic in the axillary blockade of the brachial plexus does not change the anesthetic characteristics nor the time of postoperative analgesia.
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PMID:[Addition of fentanyl to mepivacaine in axillary brachial plexus block. Effects on the anesthetic and postoperative analgesic quality]. 187 44

Epidural clonidine produces postoperative analgesia in patients and potentiates opioid analgesia in animals. The aim of the current study was to assess the effect of epidural clonidine on the plasma concentrations and analgesic effect of fentanyl after epidural administration. Twenty ASA physical status 2 or 3 patients recovering from abdominal surgery were allocated randomly to receive either epidural fentanyl (100 micrograms in 10 ml isotonic saline; EF group) or epidural fentanyl (same dose) plus epidural clonidine (150 micrograms; EF + C group) in isotonic saline solution. Analgesia was assessed over a period of 12 h after epidural injection. Venous samples were obtained until 360 min after epidural injection for radioimmunoassay determination of plasma fentanyl concentration. Onset of analgesia was similar in the two groups of patients (13 +/- 6 and 13 +/- 3 min, respectively, after injection), but duration was more than doubled in the patients receiving clonidine (543 +/- 183 vs. 250 +/- 64 min). Peak plasma fentanyl concentrations (Fmax) and the time to reach Cmax (Tmax) were comparable in the two groups (0.29 +/- 0.15 ng.ml-1 at 16.2 +/- 14.8 min in the EF group and 0.27 +/- 0.11 ng.ml-1 at 8.3 +/- 5.5 min in the EF + C group), as were plasma concentrations at each definite time of measurement. Drowsiness and hypotension were noticed in the EF + C group. Thus, epidural clonidine appears to prolong epidural fentanyl analgesia without affecting its plasma concentration.
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PMID:Effect of epidural clonidine on analgesia and pharmacokinetics of epidural fentanyl in postoperative patients. 188 48

Fifty patients of both sexes, aged between 37 and 60 years old and belonging to ASA classes I, II, III and IV, underwent urological surgery lasting more than two hours under general anesthesia using a continuous infusion of propofol, N2O/O2, vecuronium bromide 0.02% infusion. Patients were divided into two groups of 25, group A and group B, according to whether they received fentanyl or buprenorphine as an analgesic. Propofol and fentanyl consumption in group A were 5.43 +/- 0.7 mg/kg/hour and 10.53 +/- 1.7 micrograms/kg respectively, whereas those of propofol and buprenorphine in group B were 5.71 +/- 1.08 mg/kg/hour and 6.05 +/- 0.06 micrograms/kg; there was a statistically non-significant difference for propofol consumption (p greater than 0.005). During the induction and maintenance phases of anesthesia, hemodynamic parameters decreased significantly (p less than 0.001) in comparison to starting values in both groups, but no statistically significant differences were observed. Buprenorphine prolonged reawakening from anesthesia by a few minutes but at the same time extended postoperative analgesia by several hours, thus improving the overall quality of the immediate postoperative period. The most frequent side effect (32% in group A and 52% in group B) was sinusal bradycardia.
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PMID:[The use of propofol in combination with fentanyl or buprenorphine in long-duration anesthesia]. 192 59

Twenty-five ASA 1 or 2 patients undergoing thoracotomy were entered into a prospective, randomised, double-blind study comparing thoracic epidural fentanyl alone and thoracic epidural fentanyl combined with 0.2% bupivacaine. Pain relief, pulmonary function and cardiovascular stability were assessed. Pain relief was superior in the bupivacaine series (p less than 0.05) during the first day after operation and this was accompanied by better oxygenation (p less than 0.05); the difference did not persist into the second day. Forced expiratory variables were reduced in both series to 50-60% of the values before operation throughout the study (p less than 0.05) and differences did not occur between the groups. The incidence of side effects attributable to epidural fentanyl was high, but hypotension did not occur. Small doses of bupivacaine administered together with fentanyl into the thoracic epidural space improve analgesia without causing hypotension.
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PMID:Continuous thoracic epidural fentanyl for post-thoracotomy pain relief: with or without bupivacaine? 192 72

Clonidine, an alpha 2 adrenoreceptor agonist, has nonopiate antinociceptive properties, which might be an alternative for postoperative analgesia free of opioid-induced side effects. To document the analgesic properties of intravenous clonidine during the postoperative period, 50 ASA physical status 1 patients, immediately after spinal fusion, were randomly assigned to two groups, blindly administered either clonidine (5 micrograms/kg infused the 1st h and then 0.3 microgram-1.kg-1.h-1 during 11 h) or a placebo. A visual analog scale graded from 0 (no pain) to 100 mm was used to assess pain before clonidine or placebo administration (T0), at the end of the loading dose (T1) and then every 2 h (T3, T5, T7, T9, and T11). Morphine (0.1 mg/kg) was administered intramuscularly after each pain measurement if the score was greater than 50 mm. No morphine was given at T0. Hemodynamics, blood gases and plasma clonidine concentrations were measured each time the pain score was measured. The pain score decreased from 42 +/- 5 to 26 +/- 3 mm (mean +/- standard error) in the clonidine group whereas it was unchanged in the placebo group despite a greater morphine requirement (dose for each patient: 3.8 +/- 1 vs. 10.8 +/- 1.2 mg). Clonidine delayed the onset of pain and the first request for morphine injection. Mean arterial pressure decreased to 74 +/- 2 mmHg in the clonidine group (-26 +/- 2 vs. -15 +/- 2% in the placebo group at T11) despite a significant increase in the cumulative fluid volume.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Postoperative analgesia by intravenous clonidine. 192 67


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