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Year : 2017  |  Volume : 11  |  Issue : 2  |  Page : 177-184

A comparison between intravenous lidocaine and ketamine on acute and chronic pain after open nephrectomy: A prospective, double-blind, randomized, placebo-controlled study

1 Department of Anaesthesia and Intensive Care and Urology, Charles Nicolle Hospital of Tunis, Tunis, Tunisia
2 Department of Anaesthesia and Intensive Care, Children Hospital of Tunis, Faculty of Medicine of Tunis, University of Tunis El Manar, Tunis, Tunisia

Correspondence Address:
Ali Jendoubi
Department of Anaesthesia and Intensive Care, Faculty of Medicine of Tunis, Charles Nicolle Hospital of Tunis, University of Tunis El Manar, Tunis
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1658-354X.203027

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Date of Web Publication27-Mar-2017


Background: Recently, there has been increasing interest in the use of analgesic adjuncts such as intravenous (IV) ketamine and lidocaine.
Objectives: To compare the effects of perioperative IV lidocaine and ketamine on morphine requirements, pain scores, quality of recovery, and chronic pain after open nephrectomy.
Study Design: A prospective, randomized, placebo-controlled, double-blind trial.
Settings: The study was conducted in Charles Nicolle University Hospital of Tunis.
Methods: Sixty patients were randomly allocated to receive IV lidocaine: bolus of 1.5 mg/kg at the induction of anesthesia followed by infusion of 1 mg/kg/h intraoperatively and for 24 h postoperatively or ketamine: bolus of 0.15 mg/kg followed by infusion of 0.1 mg/kg/h intraoperatively and for 24 h postoperatively or an equal volume of saline (control group [CG]).
Measurements: Morphine consumption, visual analog scale pain scores, time to the first passage of flatus and feces, postoperative nausea and vomiting (PONV), 6-min walk distance (6MWD) at discharge, and the incidence of chronic neuropathic pain using the “Neuropathic Pain Questionnaire” at 3 months.
Results: Ketamine and lidocaine reduced significantly morphine consumption (by about 33% and 42%, respectively) and pain scores compared with the CG (P < 0.001). Lidocaine and ketamine also significantly improved bowel function in comparison to the CG (P < 0.001). Ketamine failed to reduce the incidence of PONV. The 6 MWD increased significantly from a mean ± standard deviation of 27 ± 16.2 m in the CG to 82.3 ± 28 m in the lidocaine group (P < 0.001). Lidocaine, but not ketamine, reduced significantly the development of neuropathic pain at 3 months (P < 0.05).
Conclusion: Ketamine and lidocaine are safe and effective adjuvants to decrease opioid consumption and control early pain. We also suggest that lidocaine infusion serves as an interesting alternative to improve the functional walking capacity and prevent chronic neuropathic pain at 3 months after open nephrectomy.

Keywords: Analgesia; chronic pain; ketamine; lidocaine; nephrectomy; recovery

How to cite this article:
Jendoubi A, Naceur IB, Bouzouita A, Trifa M, Ghedira S, Chebil M, Houissa M. A comparison between intravenous lidocaine and ketamine on acute and chronic pain after open nephrectomy: A prospective, double-blind, randomized, placebo-controlled study. Saudi J Anaesth 2017;11:177-84

How to cite this URL:
Jendoubi A, Naceur IB, Bouzouita A, Trifa M, Ghedira S, Chebil M, Houissa M. A comparison between intravenous lidocaine and ketamine on acute and chronic pain after open nephrectomy: A prospective, double-blind, randomized, placebo-controlled study. Saudi J Anaesth [serial online] 2017 [cited 2023 Jan 29];11:177-84. Available from:

  Introduction Top

Nephrectomy is one of the most common surgical procedures in urologic practice. Pain after surgery remains a significant clinical problem as it impairs rehabilitation and may lead to the development of chronic pain syndromes.[1] The open approach represents a major physical trauma including postoperative pain and discomfort in the convalescence period.[2]

Adequate control of postoperative pain facilitates earlier mobilization and rehabilitation.[3],[4] In addition, effective postoperative analgesia is an important measure for the prevention of chronic surgical pain.[5]

Multimodal analgesia is an important concept to improve analgesia and reduce the incidence of opioid-related adverse events.[6]

Recently, there has been increasing interest in the use of analgesic adjuncts such as N-methyl-D-aspartate (NMDA) receptor antagonists (e.g., ketamine)[7] and systemic infusion of lidocaine.[8]

The aim of the present study was to evaluate and compare the effects of perioperative intravenous (IV) lidocaine and ketamine on postoperative morphine requirement, pain scores, quality of postoperative recovery, and chronic pain after elective open nephrectomy.

  Methods Top

After approval of the Local Ethics Committeeand written informed consent, 63 patients undergoing elective open nephrectomy were enrolled in this prospective, randomized, double-blind study. The trial was registered at (NCT 02653651). Inclusion criteria were age ≥18 years and the American Society of Anesthesiologists (ASA) physical Class I or II. Exclusion criteria were known allergy to any of the study medications, an inability to understand the use of patient-controlled analgesia (PCA), renal (serum creatinine >2 mg/dl) or hepatic (alanine aminotransferase or aspartate aminotransferase >2 times normal) dysfunction, a severe cardiovascular disorder (ejection fraction <30%), ASA physical status ≥3, history of chronic pain, epilepsy, psychiatric disorders, chronic use of opioids or alcohol, and drug abuse.

Management protocol

The day before surgery, all participants received instructions on the use of the PCA device and the visual analog scale (VAS; ranging from 0 cm = no pain to 10 cm = worst possible pain).

All patients were premedicated with hydroxyzine 1 mg/kg orally, the night before surgery and 2 h before surgery. No prophylactic antiemetic was given.

General anesthesia was induced with propofol 2–3 mg/kg, fentanyl 3 μg/kg, cisatracurium 0.15 mg/kg and maintained by boluses of fentanyl 1 μg/kg every 30 min and inhaled sevoflurane 1 minimum alveolar concentration in 50% oxygen/air. Isotonic saline was infused at 5 ml/kg/h. Normothermia was maintained with a forced-air cover.

Patients were monitored using pulse oximetry, continuous electrocardiography, noninvasive blood pressure, end-tidal carbon dioxide (CO2) and end-tidal sevoflurane concentration. Ventilation was adjusted to maintain the end-tidal CO2 level at 35–40 mmHg.

The patients were randomly assigned to one of the three treatment groups using the sealed envelope method. A “blinded” nurse prepared the study solutions. None of the other investigators involved in patient management or data collection were aware of the group assignment. Lidocaine group (LG) received an IV lidocaine bolus of 1.5 mg/kg (0.075 ml/kg of lidocaine 2%) at the induction of anesthesia, followed by a continuous infusion of 1 mg/kg/h intraoperatively and for 24 h postoperatively. Ketamine group (KG) received an IV ketamine bolus of 0.15 mg/kg (0.075 ml/kg of solution of ketamine diluted to a concentration of 2 mg/ml in normal saline) at the induction of anesthesia, followed by infusion of 0.1 mg/kg/h intraoperatively and for 24 h postoperatively. The control group (CG) received an equal volume of normal saline 0.9%. The rate of infusion was similar for the three groups according to the patient's weight.

All patients received 1 g of IV paracetamol and 20 mg of IV nefopam 30 min before the end of the surgical procedure. After completion of the surgery, neuromuscular blockade was reversed with atropine 0.02 mg/kg and neostigmine 0.04 mg/kg, and patients were extubated when adequate spontaneous ventilation was established and were transferred to postanesthesia care unit (PACU).

In the PACU, pain was controlled by titration of IV morphine by a nurse (2 mg boluses every 5 min), if permitted according to the respiration rate (>10 bpm) and sedation score (score <1), until a VAS <3/10 cm had been achieved. The sedation score was as follows: 0 = no sedation; 1 = intermittent drowsiness; 2 = patient drowsy but could be aroused verbally; 3 = impossible to arouse the patient verbally). Thereafter, patients were connected to a PCA device set to deliver 1 mg morphine as an IV bolus with a 7 min lockout interval. There was no basal infusion. The PCA regimen was continued for 24 h. In the surgical ward, additional postoperative analgesia was provided in three groups by the combination of the paracetamol (Perfalgan ®, Bristol-Myers Squibb, Rueil-Malmaison, France) (1 g every 6 h) and nefopam IV (Acupan ®, Biocodex, Gentilly, France) (20 mg every 8 h). IV ondansetron 4 mg was given on demand if patients complained of nausea or vomiting.

Primary outcome measures

The primary outcome of the study was the cumulative morphine consumption over 24 h PO. Consumption of morphine was recorded respectively, in the periods of 0–1 h (T1), 0–6 h (T2), 0–12 h (T3), 0–18 h (T4), and 0–24 h after operation (T5).

Secondary outcome measures

Predefined secondary outcomes were: number of patients requiring morphine titration in the PACU and dose of morphine administered; pain scores (0–10 cm) at rest and during coughing during 48 h; occurrence of opioid-induced side effects (sedation, nausea vomiting, and itching); hallucinatory effects of ketamine or signs of systemic toxicity of lidocaine such as perioral numbness and metallic taste. The recovery of bowel function was assessed by the time to first passage of flatus and feces and oral intake of clear fluids. Functional walking capacity was measured by the 6-min walk distance (6MWD) in the fourth postoperative morning.[9] For patients with length of stay <4 days, the 6 MWT was performed at discharge.

The duration of hospital stay was also recorded. At 3 months, patients were contacted by telephone and were questioned for chronic postoperative pain using the neuropathic pain 4 questionnaires. The Douleur Neuropathique 4 (DN4) questionnaire indicated neuropathic pain for patients with a score ≥4.[10]

Statistical analysis

Calculation of the sample size indicated that a minimum of 54 patients (18 per group) would be required to detect a 30% difference in morphine consumption between the interventional group (lidocaine or ketamine) and the CG for an α risk of 0.05 and a power of 80%, assuming a mean morphine consumption of 48 mg ± 16 in the CG based on a preliminary evaluation.

Statistical analysis was performed with SPSS for Windows version 15.0 (SPSS, Chicago, IL, USA). Data are expressed as a mean (standard deviation [SD]). The Chi-square test was used to assess differences between groups for categorical variables. Between-group comparisons were performed with ANOVA for parametric values or the Kruskal–Wallis test otherwise. P< 0.05 was considered to be statistically significant.

  Results Top

A total of 63 patients were enrolled. Three patients were excluded: One patient because significant hemorrhage with hemodynamic instability (KG) and two cases (one in the CG and one in the LG) because of technical problems with the PCA device. Thus, 60 patients (n = 20 in each group) were included in the final analysis [Figure 1].
Figure 1: Trial flow chart. L: Lidocaine group, K: Ketamine group, C: Control group

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The three groups were comparable with respect to age, height, body mass index, ASA physical status, and duration of surgery. Intraoperative fentanyl requirements were also comparable among groups [Table 1].
Table 1: Demographic and intraoperative data

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Morphine consumption and pain scores

The mean titrated dose of IV morphine in the PACU was significantly greater in the CG (P < 0.001). The mean ± SD cumulative morphine consumption for the 24 h after surgery was significantly decreased with lidocaine 27.8 ± 5.51 mg and ketamine 32 ± 6.99 mg compared with the CG 47.6 ± 4.98 mg [Figure 2]. During the first 48 h after surgery, the VAS pain scores at rest and during coughing and movement in LG and KG were significantly lower than CG [Figure 2].
Figure 2: (a) Postoperative morphine consumption during the first 24 h after open nephrectomy.(b) Pain intensity at rest assessed using a visual analog scale.(c) Pain intensity during coughing assessed using a visual analog scale.(d) Pain intensity during movement assessed using a visual analog scale. *P< 0.05, control group compared with treatment groups (ketamine and lidocaine); P < 0.05, lidocaine group compared with ketamine group

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Opioid- induced side effects

Sedation scores were similar among groups, and no patient had a score more than 1. No urinary retention was noted in three groups at bladder catheter removal. Compared to CG, IV lidocaine infusion significantly reduced the incidence of postoperative nausea and vomiting (PONV) (no patients experienced PONV in LG (0/20) in comparison to 15 patients in CG (75%); P< 0.001), whereas, no significant difference was found between KG (13/20) and CG.

Recovery parameters

Mean time to the first flatus and to the first meal was significantly shorter in LG and KG than in CG. First defecation, mobilization time, and length of hospital stay were statistically shorter in LG and KG compared with CG [P < 0.05, [Table 2].
Table 2: Postoperative recovery parameters and chronic neuropathic pain in the three groups

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The distance covered during 6-min walking test increased significantly from a mean ± SD of 27 ± 16.2 m in the CG to 82.3 ± 28 m in the LG (P < 0.001). There was no significant difference between KG and CG patients in terms of the distance walked.

The improvement of recovery parameters (bowel function and walking capacity) was significantly better with lidocaine than ketamine [P < 0.05, [Table 2].

Chronic neuropathic pain

Concerning chronic neuropathic pain, the DN4 score was calculated for all patients; it was positive (≥4) in 17 patients. In the CG, 9 patients had a DN4 score ≥4 while in the LG, only one patient had a score of 5 (P = 0.006). Seven patients had a DN4 score ≥4 in the KG [Table 2]. Lidocaine, but not ketamine, reduced significantly the development of chronic neuropathic pain after open nephrectomy.

Adverse and toxic effects of analgesic adjuncts

There were not notable lidocaine-related adverse effects. No patients complained of hallucinations or dysphoria.

  Discussion Top

This study demonstrated that perioperative IV infusion of lidocaine or ketamine during 24 h associated with morphine PCA improved postoperative analgesia and reduced total cumulative morphine consumption over a 24-h period in patients undergoing open nephrectomy. In addition, total PCA morphine requirement was decreased by about 33% and 42% in the ketamine and LGs, respectively, compared with the CG (P < 0.001).

Both ketamine and lidocaine significantly reduced mean VAS pain scores versus placebo (P < 0.05) at rest and during cough or movement for up to 48 h postoperatively. The VAS pain scores were significantly lower in the LG compared with the KG in the first 12 h postoperatively (P < 0.05).

IV lidocaine has analgesic, antihyperalgesic,[11],[12] and anti-inflammatory effects [13] mediated by a variety of mechanisms including voltage-gated sodium channel blockade, G-protein-coupled receptor signaling,[14] NMDA antagonism,[15] suppression of central sensitization and inhibition of visceromotor reflexes.

The anti-inflammatory effects of lidocaine[13],[14],[15],[16],[17] can probably be explained by the lower neutrophil accumulation at the site of injury [18] and reduced release of inflammatory mediators. These actions justify its use in a multimodal approach to postoperative analgesia.

The studies showed a reduction in 24-h opioid consumption by about 50% in outpatients undergoing laparoscopic surgery,[19] cholecystectomy,[20] and laparoscopic colectomy.[21] Another recent study in patients who underwent laparoscopic nephrectomy, Tauzin-Fin et al.[22] found that IV lidocaine reduced the overall postoperative morphine consumption by about 66% as well as pain score at rest and during coughing during the first 2 postoperative days. A more recent Cochrane review [8] analyzed 45 studies (2802 patients) and showed that pain immediately after surgery and until 24 h was reduced by lidocaine infusion when compared to placebo or usual care.

Ketamine acts mainly as an NMDA receptor antagonist. It attenuates central sensitization induced by tissue injury and decreases the development of opioid tolerance.[23],[24],[25] Our study showed that a 24-h low-dose continuous IV infusion of ketamine combined with morphine PCA reduced morphine consumption by 33% compared to CG without any increase of side effects such as sedation or psychiatric disorders due to ketamine.

In a meta-analysis of studies of more than 2000 patients, the authors found that perioperative subanesthetic doses of ketamine reduced 24 h PCA morphine consumption. Adverse effects were mild or absent.[26] A more recent narrative review [7] concluded that ketamine was effective in controlling postoperative pain, but there is no consensus about the best ketamine administration method. Ketamine was administered using a variety of regimens, but the majority involved a preincisional loading dose of 0.15–1.00 mg/kg, with additional intraoperative infusion. Further randomized controlled trials are to determine which subgroups benefit and the optimum dose and duration of therapy.

Our results showed that systemic lidocaine and ketamine also significantly improved postoperative bowel function and reduced the duration of hospitalization in comparison to the CG. The recovery was significantly better with lidocaine than ketamine. The mean time to the first flatus and bowel movement was significantly shortened by 23 h and duration of hospital stay was reduced by an average of 1.8 days in the lidocaine-treated patients in comparison to the KG.

Several factors may contribute to the postoperative ileus such as opioid use, sympathetic hyperactivity, and the release of inflammatory mediators.[27],[28],[29]

The positive effects of IV lidocaine on bowel function could be explained by three mechanisms: the opioid sparing effect, the anti-inflammatory effect, and the blockade of inhibitory sympathetic reflexes involved in postoperative ileus. Our data are in accordance with those of Kaba et al.[21] and Tauzin-Fin et al.[22] A recent Cochrane review [8] confirms the benefits of lidocaine infusion on recovery of bowel function allowing for earlier rehabilitation and shorter duration of hospital stay.

However, the benefits of lidocaine in terms of recovery and reducing the length of hospital stay were not demonstrated in patients undergoing total hip arthroplasty or coronary artery bypass surgery.[30],[31]

The anti-inflammatory effect of ketamine was documented in several studies.[32],[33] The effect of ketamine on perioperative inflammatory responses has been studied in patients undergoing total hip arthroplasty,[34] hysterectomy,[35] thoracotomy,[36] and cardiac [37] and spine surgery.[38] The role of ketamine as a component of perioperative recovery process remains unclear.

Functional walking capacity as measured by 6MWT distance increased significantly in lidocaine-treated patients. Similar findings were reported by the previous studies evaluating the functional walking capacity after laparoscopic prostatectomy [39] and laparoscopic nephrectomy.[22]

Our data showed that perioperative lidocaine infusion reduced significantly PONV. This is in agreement with the Vigneault et al. meta-analysis.[40] However, the opioid sparing effect of ketamine did not lead to a subsequent reduction in the incidence of PONV. This finding disagree with a Cochrane review analyzing 37 studies (2240 patients) indicating that subanesthetic perioperative ketamine was effective in reducing the incidence of PONV.[26] On the other hand, several studies confirm our data showing no significant reduction in PONV with ketamine infusion.[41],[42] Furthermore, ketamine exacerbated PONV in patients at high risk of PONV undergoing lumbar spinal surgery.[43]

In contrast to the LG, ketamine failed to improve the functional walking capacity. Our results are in line with a previous study in which ketamine failed to improve 6MWT on the 2nd postoperative day after open hysterectomy. Ketamine was given as a bolus 0.35 mg/kg, followed by ketamine infusion of 0.2 mg/kg/h for the first 2 h and then 0.12 mg/kg/h for 24 postoperative h.[35]

Chronic postsurgical pain (CPSP) is defined as pain that persists for longer than 3 months.[44] Inadequate pain management after surgery elevates the risk of postoperative complications and it is one of the major risk factors associated with CPSP, which adversely affects the quality of life and delays rehabilitation and return to usual activities.

CPSP is a largely unrecognized problem that may occur in 10%–65% of postoperative patients depending on the type of surgery, with 2%–10% of these patients experiencing severe CPSP. Little is known about the progress of persistent pain after nephrectomy.[1],[45] One month after nephrectomy, pain has been reported in 58% and 78% of patients into two different studies.[46],[47] The incidence of CPSP after open nephrectomy ranges from 4% to 27%.[48]

Our results further indicated that chronic neuropathic pain was found to be significantly lower in the LG compared with the ketamine and CGs. More recent studies have also demonstrated the effectiveness of lidocaine infusion in decreasing chronic pain.[49],[50],[51]

In agreement with our data, recent studies reported that perioperative ketamine improved early recovery but lacked the effect on chronic postoperative pain.[52],[53]

In contrast, a recent meta-analysis performed in 2013 suggested the modest but statistically significant reduction in the incidence of chronic pain after surgery following treatment with ketamine. Unfortunately, most of the included studies were small which could lead to the overestimation of treatment effect.[54]

Regarding adverse events, no lidocaine-related systemic toxicity signs were reported. Perioperative low-dose ketamine infusion was not associated with significant side effects, which is similar to the previous reports. Low-dose ketamine has been defined as a bolus of <1 mg/kg IV and an infusion rate <1.2 mg/kg/h.[55]

Our study is one of the very fewhead-to-head randomized clinical trials comparing ketamine versus lidocaine.

The limitations of this study include its single-center design, which limits generalization of the findings. Another limitation concerns the absence of physical examination of the patients with persistent pain and the use of simple questionnaire to confirm neuropathic pain. The choice of DN4 was based on its simplicity.

  Conclusion Top

In summary, our findings confirmed beneficial effects of IV infusion of lidocaine or ketamine during the first 24 h postoperatively in combination with morphine PCA to reduce postoperative opioid consumption and improve postoperative recovery after elective open radical nephrectomy.

We could suggest that lidocaine infusion serves as an interesting alternative to improve the functional walking capacity and prevent chronic neuropathic pain at 3 months after open nephrectomy. However, our results do not support the use of ketamine for improving the 6MWT, the 4th postoperative day after open nephrectomy. Ketamine could not reduce the incidence of PONV and it failed also to prevent neuropathic pain. Nevertheless, further studies are needed to determine the best perioperative lidocaine and/or ketamine regimen for postoperative pain control and prevention of postoperative chronic pain syndrome after open nephrectomy.

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Conflicts of interest

There are no conflicts of interest.

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