比较应用氯氨酮和对乙酰氨基酚来防止接受腹式全子宫切除术的患者中瑞芬太尼所引起的痛觉过敏

比较应用氯氨酮和对乙酰氨基酚来防止接受腹式全子宫切除术的患者中瑞芬太尼所引起的痛觉过敏 Int J Med Sci. 2012; 9(5): 327–333. Published online 2012 June 20. doi: 10.7150/ijms.4222 PMCID: PMC3384914 A Comparison of Ketamine and Paracetamol for Preventing Remifentanil Induced Hyperalgesia in Patients Undergoing Total Abdominal Hysterectomy 1222,2Naime Yalcin, Sema Tuncer Uzun, Ruhiye Reisli, Hale Borazan, and Seref Otelcioglu Author information ? Article notes ? Copyright and License information ? Go to: ABSTRACT Background: The aim of this prospective, randomized, placebo-controlled study was to compare the effects of ketamine and paracetamol on preventing remifentanil induced hyperalgesia. Methods: Ninety patients undergoing total abdominal hysterectomy were randomly assigned to one of three groups to receive (I) either saline infusion; (II) 0.5 mg/kg ketamine iv bolus or (III) 1000 mg iv paracetamol infusion before induction of anesthesia. Until the skin closure, anesthesia was maintained with 0.4 µg/kg/min remifentanil infusion in all groups, additionally Group II received 5 µg/kg/min ketamine infusion. Pressure pain thresholds were measured the day before surgery during the preoperative visit for baseline measurements and repeated postoperatively at 24 and 48 hours (hrs). Pressure pain thresholds were established by digital algometer on three different peri- incisional regions for calculating mean pressure pain threshold values. The visual analogue scale (VAS), sedation scores, total morphine consumption and side effects were assessed postoperatively. Results: Demographic characteristics, duration of surgery and anesthesia were similar in the three groups. Pain thresholds at the incision region were significantly lower at 24 and 48 hrs postoperatively in Group I than the other Groups (p< 0.05). In Group ?, pain thresholds were lower compared with preoperative baseline values. Thresholds in Group ?? and Group ??? were higher compared with preoperative baseline values (p< 0.05) The VAS scores at all evaluation times were significantly higher in Group ? when compared to Group ?? and at 2, 4, 6 ,12 hrs were higher in Group I than Group ??? (p< 0.05). The morphine consumption was higher in Group ??? at 24 and 48 hrs postoperatively (p< 0.05). Conclusion: It was shown that ketamine and paracetamol were both effective in preventing remifentanil induced hyperalgesia. Keywords: remifentanil, ketamine, paracetamol, postoperative pain, hyperalgesia. Go to: INTRODUCTION Opioids are potent analgesics that are often necessary for treating moderate to severe pain. However, experimental studies report that opioids may also elicit hyperalgesia and allodynia 1. It is, therefore, likely that tolerance develops more rapidly with a rapid offset drug such as remifentanil than with longer acting opioids 2. The most likely explanation for the greater postoperative analgesic requirement for remifentanil is development of acute opioid tolerance to morphine analgesia 3. Opioid-induced processes that underlie hyperalgesia -reduce antinociception and contribute to opioid tolerance 46. Among the potential mechanisms leading to opioid induced hyperalgesia and antinociceptive tolerance,N-methyl-D-aspartate (NMDA) pain-facilitator ,,processes seem to play a key role 178. Experimental studies performed in animals and volunteers have shown that NMDA receptor antagonists such as ketamine -inhibit central sensitization and prevent opioid induced hyperalgesia 912. The analgesic and antihyperalgesic actions of cyclooxygenase (COX) inhibitors, the so-called non-steroidal anti-inflammatory drugs (NSAIDs), have traditionally been attributed to inhibition of peripheral prostaglandin (PG) synthesis in inflamed tissue 13. However, there is increasing evidence that at least part of their analgesic effects depends on COX inhibition in the central nervous system 14. Both isoforms are constitutively expressed in the rat brain and spinal cord 15. Recently, a third distinct isoform, COX-3, has been described, which is a spliced COX-1 variant and is suggested to represent the primary central mechanism by which paracetamol (acetaminophen) decreases pain and possibly fever13. In the last decade, several peripheral antihyperalgesic actions of NSAIDs have been demonstrated in human models of mechanical and heat hyperalgesia 16. In rats, there is also evidence for COX-induced central sensitization. Also, in humans, the rapid onset of analgesic effects of COX-2 inhibitors after brief surgical intervention suggest a central antihyperalgesic effect, but direct evidence for this ,action is still lacking 1517. In humans, opioid tolerance, the analgesic effects of opioids and opioid -requirements are evaluated with a quantitative sensorial test (QST) 1820. It was shown that ketamine prevented postoperative hyperalgesia induced by remifentanil 1. However, we did not find the effects of paracetamol on remifentanil induced hyperalgesia in the postoperative setting. Therefore, we planned to test the effects of paracetamol on remifentanil-induced hyperalgesia and compare these with ketamine, which has been shown to prevent remifentanil-induced hyperalgesia, by using postoperative pain scores, opioids consumption and quantitative sensorial test. Go to: MATERIALS & METHODS After receiving approval from Ethical Committee of Selcuk University Meram Medical Faculty, Konya, Turkey (Ethical Committee B.30.2.SEL. 002.0081-2917, 30 April 2008) and written informed consent, we enrolled 90 patients of ASA physical status I-II scheduled for elective total abdominal hysterectomy by using a computer-generated random number system. Patients with a history of psychiatric disorders, chronic pain, renal, cardiac or hematological insufficiency, chronic analgesic or opioid treatment, aged below 35 yr and above 70 yr, inability to use a patient-controlled analgesia (PCA) device and duration of surgery over 120 min were excluded from the study. During the preoperative visit, the day before surgery, all patients were instructed in the use of the 10-step visual analogue scale (VAS; 0 = no pain, 10 = greatest imaginable pain), PCA device (Abbott Pain Management Provider, Chicago), and quantitative sensory tests (QST) applied with a digital pressure algometer (Chatillon DFE-100, Digital Force Gauge/AMETEK) by an anesthesiologist. Additionally, baseline values for QST on skin area of surgery were performed. A handheld digital pressure algometer with 2a 1 cm probe area was used to determine pressure pain threshold. The patients informed the researcher when pain was perceived and the researcher immediately pushed a button to freeze the digital display. The first pressure value at which pain was registered was saved as Lb unit value. The average of three measurements with an interstimulus interval of 60 s was defined as the pressure pain threshold value. Pressure pain thresholds were measured in an area 2-3 cm from the incision at three levels (top, middle, and bottom; baseline values) and on the inner forearm (control values). A mean value for the three peri-incisional regions was calculated and used for statistical comparisons. The, QSTs were repeated at 24 and 48 hours postoperatively. All patients were premedicated with 10 mg oral diazepam the night before surgery and 10 mg intramuscular diazepam one hour before surgery. Patients were randomly assigned to one of the three groups using a computer-generated random numbers. Baseline heart rate, systolic (SAP), diastolic (DAP) and mean arterial pressure (MAP) were recorded before induction of anesthesia and at 15 min intervals during surgery. Patients in Group I received physiologic saline; whereas those in Group II received intravenous (iv) bolus ketamine 0.5 mg/kg, and those in Group III received 1000 mg paracetamol (infusion/15 min) before the induction of anesthesia. The patients in Group II also received a maintenance infusion of 5 µg/kg/min ketamine intraoperatively until skin closure. General anesthesia was induced with remifentanil 1 µg/kg and propofol 1.5-2 mg /kg followed by atracurium 0.5 mg/kg to facilitate tracheal intubation. Anesthesia was maintained with 0.4 µg/kg/min remifentanil infusion and desflurane 0.5 MAC. Lungs were mechanically ventilated (end-tidal CO2 values of 35-40 mmHg) with 50% air in an oxygen mixture. All patients in the three groups had received the same anesthesia regimen. Insufficient anesthesia was defined as a heart rate that exceeded pre-induction values by 15% and SAP exceeding baseline values by 20% for at least 1 min. Patient movement, coughing, tearing and sweating were also considered signs of inadequate anesthesia. Inspired desflurane was increased stepwise by 1% MAC when insufficient anesthesia was suspected. Hypotension, defined by a MAP less than 60 mmHg, prompted stepwise 1% MAC reductions in desflurane. If bradycardia and hypotension persisted, additional iv fluids, atropine and ephedrine were also given. Thirty minutes before the anticipated end of surgery, a 0.15 mg/kg bolus dose of morphine was given intravenously. After skin closure, desflurane, remifentanil and ketamine infusion were discontinued, and residual neuromuscular blockade was reversed by 0.04-0.08 mg/kg iv neostigmine and 0.02-0.04 mg/kg iv atropine. The trachea was extubated when patients responded to the verbal commands, spontaneous respiratory rate exceeded 12 breaths/min, and end-tidal carbon dioxide partial pressure was less than 45 mmHg. The times from the remifentanil discontinuation until awakening (awakening time) and tracheal extubation (extubation time) were recorded. When patients responded to verbal commands, the first postoperative VAS was taken and noted as VAS 0 hr. Another observer, who was unaware of patients' group assignments, evaluated patients during the postoperative period. When VAS score was less than 5, patients were connected to a PCA device set to deliver 1 mg morphine as an iv bolus with a 6-min lockout interval; continuous infusion was not allowed. This PCA regimen was continued for 48 hrs after tracheal extubation and other analgesics were not used during this period. The VAS scores, analgesic demand, analgesic delivery, morphine consumption and sedation scores (1: patient fully awake, 2: patient occasionally asleep, 3: patient often sleep but awakening easily 4: difficulty awakening, 5: not awakening) were recorded at 2, 4, 6, 12 and 24 hrs postoperatively. Any adverse postoperative effects, such as nausea-vomiting, nightmare, diplopia, hallucination or agitation were noted. The -satisfaction with analgesia of the patients was graded on a four-point scale 14 as follows: 1, poor; 2, intermediate; 3, good; 4, excellent. Statistical Analysis All analyses were conducted using SPSS software (Statistical Package for the Social Sciences, version 13.0, SPSS Inc, Chicago, IL, USA). Data was reported as mean ? standard deviation and the number n (%). One-way ANOVA (analysis of variance) was used for comparison between groups. Paired group-wise tests were performed to find groups that make a difference. Kruskal Wallis analysis was performed for the variables which were not included in the variance analysis. P values < 0.05 were considered significant. Go to: RESULTS Ninety patients were enrolled in the study. Eleven patients were excluded due to postoperative fever, duration of surgery and non-cooperation. Twenty-seven patients were randomly assigned to Group ? (control), twenty-six to Group ?? (ketamine) and twenty-six to Group ??? (paracetamol). Demographic characteristics, duration of surgery and anesthesia were similar in the three treatment groups. Awakening time and extubation time were compared in the three groups, and they were significantly longer in Group II than other groups. (p< 0.05) (Table (Table11). Table 1 Patient characteristics and intraoperative variables. Values are shown as number of patients or mean ? SD. Intraoperatively desflurane requirement, SAP, DAP, MAP and heart rate were similar in the three groups. Three patients in Group ?, one in Group ?? and three in Group ??? required 0.5 mg atropine treatment (p > 0.05). Pain VAS scores at 0, 2, 4, 6, 12 and 24 hrs postoperatively were assessed in all groups (Figure (Figure1).1). The VAS scores at all evaluation times were significantly higher in Group ? when compared to patients in Group ?? and at 2, 4, 6 ,12 hrs were higher in Group I than Group ??? (p < 0.05). The VAS scores between Group ?? and Group ??? were similar (p > 0.05). Figure 1 Postoperative VAS values of the Groups (mean?SD). * p< 0.05; Group I vs Group II; † p< 0.05; Group I vs Group III. At all of the postoperative evaluation times, analgesic delivery was higher in Group ? compared to Groups ?? and ???. Patients' analgesic delivery was significantly higher at the 2, 12, 24 and 48 hrs in Group ??? than Group ?? (p< 0.05) (Table (Table2).2). Analgesic demand was significantly lower in Group ?? compared to Groups ? and ??? (Table (Table3).3). Analgesic requirements were significantly higher in Group ? at all times than Group ?? and at 4, 6, 12, 24 and 48 hrs than Group ??? (p < 0.05). Cumulative 24 and 48 hrs morphine consumption was higher in Group ??? than Group ?? (35.34?13.71mg at 24 hr and 42.52?15.08 mg at 48 hr in Group II; 48.53?12.40 at 24 hr and 57.11?16.71 mg at 48 hr in Group III) (p < 0.05). Table 2 Analgesic delivery (mg of morphine consumption of the patients; the amount of infused and bolus doses of morphine with PCA device) of the patients. Values are shown as mean ? SD. Table 3 Analgesic demand (presses to the button of the PCA for delivery of morphine ) of the patients. Values are shown as mean ? SD. There were no significant differences between the Groups in terms of pain thresholds assessed with an algometer at 24 and 48 hrs and preoperatively on inner forearm. Pain thresholds at the incision region were significantly lower at 24 and 48 hrs postoperatively in Group I than in the other two Groups (p < 0.05). In Group ? pain thresholds were lower compared with pre-operative baseline values; in Group ?? and Group ??? pain thresholds were higher compared with pre-operative baseline values (p < 0.05) (Figure (Figure22). Figure 2 Mean Pressure Pain Thresholds (Lb) determined with digital pressure algometer on inner forearm and the surgical incision area at preoperative period and than ththpostoperative 24 and 48 h (mean?SD ). * p< 0.05; Group I vs Group II; † ... With respect to satisfaction scores, the patients in Group II and Group III were more satisfied than those in Group I and it was found to be statistically significant (p< 0.05) (Table (Table4).4). The incidences of nausea, vomiting and need for antiemetic treatment were similar in all groups. With respect to postoperative ketamine psychopharmacologic effects, two patients reported nightmare at 24 and 48 hrs after surgery and seven patients reported diplopia at 24 hrs. Sedation scores were similar in all groups but was higher in Group II only at postoperative 2nd hr. (Figure (Figure33). Table 4 Satisfaction scores of the patients. Values are shown as number of patients and percentage median. Figure 3 Postoperative Sedation Scores of the Groups (mean?SD). * p< 0.05 (Comparison between groups) Go to: DISCUSSION The half-life of remifentanil is too short and therefore remifentanil is recommended for use as an infusion and is widely used as an important part of general anesthesia 3. Since the effect of duration is short, it is recommended to use additional analgesics before surgery ends to prevent postoperative pain. However, in these cases, earlier and more frequent use of first dose postoperative , ,analgesic is connected to acute opioid tolerance 21121. In a study by Joly et al. using low (0.05 mg/kg/min) and high (0.4 mg/kg/min) doses of remifentanil, morphine consumption was higher in the high dose remifentanil group 1. This situation has been linked to development of rapid acute opioid tolerance and it is emphasized that the dose of remifentanil used was important 1. In line with this data, the current study used remifentanil at the dose of 0.4 mg/kg/min in order to better evaluate of the effectiveness of paracetamol and ketamine. In hyperalgesia due to opioids, there is a relationship between reduction of -,antinociception and opioid tolerance 469. Under the guidance of potential mechanisms between antinociceptive tolerance and opioids induced hyperalgesia, NMDA is seen to play a key role in processes facilitating on pain 8. In experimental studies with volunteers, NMDA receptor antagonists such as ketamine inhibit central sensitization and have been shown to prevent opioid -connected hyperalgesia 912. It was shown that low dose ketamine (0.5 mg/kg bolus and 0.5 mg/kg/min) when added to remifentanil, prevented remifentanil induced hyperalgesia 1. In line with this data, we elected to add low-dose ketamine (0.5 mg/kg bolus and 0.5 mg/kg/min infusion) to remifentanil infusion in our study. Tolerance of opioids and hyperalgesia were evaluated with analgesic effect, opioid ,-needs and quantitative sensory tests in several studies 91820. QST, clinical and sensory evaluation are important experimental tools. In our study, postoperative pain scores and morphine consumption was characterized by an increase in hyperalgesia. The pressure pain threshold were assessed with digital pressure algometer. In the current study, VAS scores were found to be significantly better in the ketamine group than control group and in accordance to this, morphine consumption was also found to be less than the control group. Decreased hyperalgesia was detected in the sensory test with a digital algometer, conducted at 24 and 48 hrs postoperatively in Group ??. Joly et al. used the same dose of remifentanil and ketamine as used in the present study, but pain scores and hyperalgesia in their study were not affected 1. We could explain this difference with the first bolus dose of ketamine use before the induction and use prior to the opioid implementation. Jaksch et al 22 used the same bolus dose of ketamine before the induction as we have implemented, but in their study postoperative pain were not affected. This is another different result from our study, and we believe his may be related to the high infusion dose usage in our study. The peripheral anti-inflammatory and antihyperalgesic effects of NSAIDs have , been shown in experimental and clinical studies 1323. Despite a large number of experimental studies related to central antihyperalgesic effects, there is a very limited number of clinical studies 13. In a study of central hyperalgesia models in rats, Bianchi and Paneri 24 evaluated the antihyperalgesic effects of lornoxicam, piroxicam and meloxicam, which have the same chemical structure but different COX-1 and COX-2 selectivities. All showed the same anti-inflammatory effect, did not cause changes in thermal nociceptive threshold, and significantly reduced hyperalgesia. However, only lornoxicam has been reported to be fully effective in prevention of hyperalgesia. The difference between anti-inflammatory and antihyperalgesic activities of NSAIDs and with the blocking of both COX-1 and COX-2 antihyperalgesic activity to be significantly reported 24. Peripheral inflammation, increased levels of spinal PG's, spinal PGE2, largely involved in the spinal nociceptive process and the increase in PGE2 concentration was shown to be correlated with hyperalgesia 24. Different results have been reported on the antihyperalgesic effects of COX-3 inhibitors assumed as COX-1 variants and centrally effective paracetamol. In a study of volunteers, the antihyperalgesic effect of paracetamol (1000 mg) was evaluated and was shown to reduce secondary hyperalgesia field 13. In another study on volunteers, no antihyperalgesic effect of paracetamol (1000 mg) was reported 25. We did not come across a study evaluating the efficacy of paracetamol in preventing hyperalgesia due to intraoperative use of remifentanil. Therefore, in this study, paracetamol activity was compared with ketamine, supported by clinical studies, to prevent remifentanil induced hyperalgesia. We showed that VAS scores and morphine consumption was less in both the ketamine and paracetamol group. Additionally, reduced hyperalgesia was detected in the sensory test performed by digital algometer at 24 and 48 hrs postoperatively. These results show that paracetamol is also effective in preventing remifentanil induced hyperalgesia in humans, which has been known to contribute to secondary hyperalgesia. The most important factor limiting the use of intraoperative and postoperative agents is undesirable effects. Ketamine may extend the period of awakening and extubation, may cause bad dreams, double vision, hallucinations, and agitation. It is also associated with dose-dependent incidence of side effects. In small doses (< 10 mg/hr), cognitive functions are not affected 26. In our study, in the ketamine group, during the early postoperative period, 7 patients had diplopia and 2 patients experienced bad dreams. The incidence of nausea and vomiting was similar between groups. Extubation and awakening time was longer in the ketamine group. Early postoperative sedation scores were higher in the ketamine group. The psychotomimetic reactions were not observed in the current study because of using low doses of ketamine. These low levels of ketamine do not usually cause side effects. We did not see any side effect associated with the use of paracetamol. Patient satisfaction was higher in the ketamine and paracetamol groups. We believe these results are based on better VAS scores. In this study, we evaluated the effect of preemptive 1000 mg paracetamol on remifentanil-induced hyperalgesia in comparison with ketamine. Intraoperative hemodynamic parameters were not affected and no significant change in desflurane concentration was seen than ketamine group. In the postoperative period, pain scores and morphine consumption were lower in both the paracetamol and ketamine group. In conclusion, concerning the effects of the drugs, paracetamol is as effective as ketamine in preventing hyperalgesia caused by the use of intraoperative remifentanil. Further studies comparing paracetamol with other drugs that have been shown to prevent opioid induced hyperalgesia are needed to confirm our results. 比较应用氯氨酮和对乙酰氨基酚来防止接受腹式全子宫切除术的患者中瑞芬太尼所引起的 痛觉过敏 梗概: 背景: 这个前瞻性，随机，安慰剂对照研究的目的是比较的氯氨酮和对乙酰氨基酚对预防瑞芬太尼 引起的痛觉过敏的影响。 方法: 90例接受腹式子宫切除术的患者被随机分为三组，(I)为生理盐水组(II)接受0.5 mg / kg 氯胺酮静脉推注(III)接受1000毫克对乙酰氨基酚静脉注射，给组的药物均在麻醉诱导前 给予。直到皮肤缝合，各组都以0.4微克/公斤/分钟的瑞芬太尼维持麻醉，此外第二组同时 接受5微克/公斤/分钟氯胺酮静脉维持。手术的前一天的术前访视中进行压力疼痛阈值测量 以作为基线，术后24小时和48小时(小时)重复测量。在切口周围不同的三个地区分别用 数字痛觉计测量压力疼痛阈值，计算平均压力疼痛阈值的。术后应用视觉模拟评分法(VAS)， 镇静评分，总的吗啡用量和副作用进行了评估。 结果: 病人的状态，手术时间和麻醉在三组之间相似。第一组后24小时和48小时在切口区域的疼痛阈值均与其他组相比显着降低术(P <0.05)。第一组术后的疼痛阈值与术前基线值相比显著低。第??和第???的疼痛阈值与术前基线值有显著地提高(P <0.05)。VAS评分在所有的评估时间的第一组?组与第二组组比较时显着较高，在术后第2，4，6，12小时的VAS评分I组比组???较高(P<0.05)，第三组???在术后24小时和48小时的吗啡的使用较高(P <0.05)。 讨论: 由于瑞芬太尼的半衰期太短，因此瑞芬太尼被建议用于静脉持续输注，被广泛地用作全身麻醉的一个重要组成部分。由于的效果的持续时间短暂，建议在手术结束前使用额外的镇痛药以防止术后疼痛。然而，在这种情况下，早期更频繁的使用术后镇痛药物可能导致急性阿片类药物的耐受性。有研究显示，使用低(0.05毫克/千克/分钟)和高剂量(0.4毫克/千克/分钟)瑞芬太尼相比，吗啡用量在高剂量瑞芬太尼组明显增多。所用的瑞芬太尼的使用剂量是重要的。按照这个数据，目前的研究，以便更好地评估的有效性，对乙酰氨基酚和氯胺酮瑞芬太尼剂量为0.4毫克/公斤/分钟。 由于阿片类药物导致的痛觉过敏，在减少镇痛药物的使用和阿片类药物的耐受性之间有一定的关系。镇痛耐受性和阿片类药物引起的痛觉过敏之间的潜在机制的指导下，NMDA(N-甲基-D-天冬氨酸)被认为是促进对疼痛的进程发挥了关键作用。已有实验明NMDA受体(N-甲基-D-天冬氨酸受体)拮抗剂，如氯胺酮通过抑制中枢敏感化，并已被证明是防止阿片类药物痛觉过敏。结果表明，低剂量氯胺酮(0.5 mg / kg的丸剂，0.5毫克/千克/分钟)时，添加到瑞芬太尼，可以防止雷米芬太尼引起的痛觉过敏。 非甾体抗炎药已经在实验和临床研究中显示出对外周的的抗炎作用和抗痛觉过敏的影响。然而，已报道只有氯诺昔康，才能充分有效预防的痛觉过敏。 COX-3抑制剂被认为为COX-1的变种，乙酰氨基酚集中有效的抗痛觉过敏作用已有不同的结果的报道了。在一项研究中，对志愿者使用乙酰氨基酚(1000毫克)的抗痛觉过敏作用进行了评估，结果显示，可以减少继发性痛觉过敏的发生。然而在另一项研究中，对乙酰氨基酚(1000毫克)没有抗痛觉过敏作用。因此，在本研究中，对乙酰氨基酚的效果与氯胺酮进行了比较，来观察防止瑞芬太尼导致的痛觉过敏的效果。我们发现，VAS评分和吗啡用量在氯氨酮和对乙酰氨基酚组均减少。这些结果表明，对乙酰氨基酚，也有效地防止雷米芬太尼诱导在人类的痛觉过敏，已被确认有助于次级痛觉过敏。 氯胺酮可以延长期限的觉醒和拔管，可能会造成不好的梦，复视，幻觉，躁动。它也与剂量依赖性的副作用的发生率。在小剂量(<10毫克/小时)，认知功能不受影响。在我们的研究中，氯胺酮组，在术后早期，7例患者有复视，2例患者经历了恶梦。恶心和呕吐的发生率是相似的。 结论: 它表明氯胺酮和对乙酰氨基酚均有效地防止瑞芬太尼导致的痛觉过敏的。