Abdourahmane Kaba

Intravenous lidocaine infusion reduces bispectral index-guided requirements of propofol only during surgical stimulation

BACKGROUND I.V. lidocaine reduces volatile anaesthetics requirements during surgery. We hypothesized that lidocaine would also reduce propofol requirements during i.v. anaesthesia. METHODS A randomized controlled study of 40 patients tested the effect of i.v. lidocaine (1.5 mg kg(-1) then 2 mg kg(-1) h(-1)) on propofol requirements. Anaesthesia was maintained with remifentanil and propofol target-controlled infusions (TCI) to keep the bispectral index (BIS) around 50. Effect-site concentrations of propofol and remifentanil and BIS values were recorded before and after skin incision. Data were analysed using anova and mixed effects analysis with NONMEM. Two dose-response studies were then performed with and without surgical stimulation. Propofol TCI titrated to obtain a BIS around 50 was kept constant. Then patients were randomized into four groups: A, saline; B, 0.75 mg kg(-1) bolus then infusion 1 mg kg(-1) h(-1); C, 1.5 mg kg(-1) bolus and infusion 2 mg kg(-1) h(-1); and D, 3 mg kg(-1) bolus and infusion 4 mg kg(-1) h(-1). Lidocaine administration coincided with skin incision. BIS values and haemodynamic variables were recorded. Data were analysed using linear regression and two-way anova. RESULTS Lidocaine decreased propofol requirements (P<0.05) only during surgery. In the absence of surgical stimulation, lidocaine did not affect BIS nor haemodynamic variables, whereas it reduced BIS increase (P=0.036) and haemodynamic response (P=0.006) secondary to surgery. CONCLUSIONS The sparing effect of lidocaine on anaesthetic requirements seems to be mediated by an anti-nociceptive action.

Acute rehabilitation program after laparoscopic colectomy using intravenous lidocaine.

Abstract Background: The concept of postoperative acute rehabilitation was introduced to accelerate postoperative recovery and improve outcome. We investigated whether intravenous lidocaine infusion, which decreases postoperative pain and speeds the return of bowel function, can be used instead of epidural analgesia in an acute rehabilitation protocol for patients undergoing laparoscopic colectomy. Methods: Twenty eight consecutive patients scheduled for laparoscopic colectomy were prospectively included in this case series study. Segmental colectomy was performed only for benign pathology. Intraoperative opioid use was restricted. After a bolus injection of lidocaine 1.5 mgkg-1, an infusion (2 mgkg-1h-1, IV) was started before pneu-moperitoneum. Balanced analgesia was used to reduce postoperative opioid consumption. Patients were allowed to drink 6 h postoperatively. The day after surgery, patients were allowed to eat a normal breakfast. Enforced mobilisation and ambulation were required from the patients. Our goal was to discharge patients within 3 days after surgery. Postoperative pain was measured. Time to first flatus, defecation, and hospital discharge were recorded. Results: Mean postoperative pain at rest and mobilisation remained below 30 mm on a 100 mm visual analogue scale. Time to first flatus, defecation, and hospital discharge were 29 ± 13 h, 38 ± 13 h, and 3.0 ± 1.0 days, respectively. Conclusion: Acute rehabilitation after laparoscopic colectomy using IV lidocaine gives similar outcomes to those reported using epidural analgesia.

Effect of an intravenous infusion of lidocaine on cisatracurium-induced neuromuscular block duration: a randomized-controlled trial

Background: Intravenous lidocaine can be used intraoperatively for its analgesic and antihyperalgesic properties but local anaesthetics may also prolong the duration of action of neuromuscular blocking agents. We hypothesized that intravenous lidocaine would prolong the time to recovery of neuromuscular function after cisatracurium.