To Explore the Safety and Efficacy of Intravenous Infusion of Different Doses of Lidocaine in Patients

To Explore the Safety and Efficacy of Intravenous Infusion of Different Doses of Lidocaine in Patients

A Pilot Study on the Safety and Efficacy of Intravenous Infusion of Different Doses of Lidocaine for Postoperative Analgesia in Patients With Open Hepatectomy

All patients who met the inclusion criteria were randomly divided into four groups, 30 cases in each group, which were lidocaine group 1, lidocaine group 1.5, lidocaine group 2, and the placebo group In lidocaine group 1, lidocaine group 1.5, and lidocaine group 2, 1% lidocaine 1.5 mg/kg was intravenously infused with a micropump after anesthesia induction, and the infusion was completed within 10 minutes according to the ideal body weight, and then continued for 1% lidocaine was infused at 1 mg/kg.h, 1.5 mg/kg.h and 2 mg/kg.h respectively until the end of the operation. In the placebo group, the same volume of normal saline was used instead.

All patients who met the inclusion criteria were randomly divided into four groups, 30 cases in each group, which were lidocaine group 1, lidocaine group 1.5, lidocaine group 2, and the placebo group In lidocaine group 1, lidocaine group 1.5, and lidocaine group 2, 1% lidocaine 1.5 mg/kg was intravenously infused with a micropump after anesthesia induction, and the infusion was completed within 10 minutes according to the ideal body weight, and then continued for 1% lidocaine was infused at 1 mg/kg.h, 1.5 mg/kg.h and 2 mg/kg.h respectively until the end of the operation. In the placebo group, the same volume of normal saline was used instead.Postoperative pain management during the first 72 postoperative hours will involve the use of a PCIA device, which will contain lidocaine 30mg/kg, sufentanil 2 μg/kg, granisetron 12 mg diluted to 200 mL in 0.9 % normal saline. In the placebo group, the same volume of normal saline will be administered during anesthesia. The postoperative PCIA device will contain sufentanil 2 μg/kg, granisetron 12 mg diluted to 200 mL in 0.9% normal saline solution with a total volume of 200 ml. All the background infusions of PCIA will set at 2 ml/h, the bolus volume of each PCIA press is 2 ml and the lockout interval is 15 min.

The experimental patients are randomly divided into three groups and received different doses of lidocaine and the control group received the same amount of saline.

The participants, the anesthesiologist, data collectors, the physicians performing the follow-up, and data analysts will be blinded to the group allocation. Blinding will maintain until the completion of the final analyses.

After induction of anesthesia, 1% lidocaine 1.5mg/kg (ideal body weight, 10min pumped) was injected intravenously with a micro pump, and then 1% lidocaine 1mg/kg.h (ideal body weight) was continuously pumped until the end of the operation , connected to patient-controlled intravenous analgesia (PCIA) pump containing lidocaine 0.3-1.5mg/kg.h after operation to 72h after operation.

After induction of anesthesia, 1% lidocaine 1.5mg/kg (ideal body weight, 10min pumped) was injected intravenously with a micro pump, and then 1% lidocaine 1.5mg/kg.h (ideal body weight) was continuously pumped until the end of the operation , connected to patient-controlled intravenous analgesia (PCIA) pump containing lidocaine 0.3-1.5mg/kg.h after operation to 72h after operation.

After induction of anesthesia, 1% lidocaine 1.5mg/kg (ideal body weight, 10min pumped) was injected intravenously with a micro pump, and then 1% lidocaine 2mg/kg.h (ideal body weight) was continuously pumped until the end of the operation , connected to patient-controlled intravenous analgesia (PCIA) pump containing lidocaine 0.3-1.5mg/kg.h after operation to 72h after operation.

The lidocaine group 1, 1.5 and 2 groups were injected with 1% lidocaine 1.5mg/kg (ideal body weight, 10min infusion) after anesthesia induction, respectively, and then continued to infuse 1% lidocaine. 1mg/kg.h, 1.5mg/kg.h, 2mg/kg.h (ideal body weight) until the end of the operation, and a patient-controlled intravenous analgesia (PCIA) pump containing lidocaine (PCIA) 0.3-1.5mg/kg after surgery. h to 72h after surgery.

Plasma lidocaine concentration is an important indicator for evaluating the safety of the drug during use

Plasma lidocaine concentration is an important indicator for evaluating the safety of the drug during use

Plasma lidocaine concentration is an important indicator for evaluating the safety of the drug during use

Lidocaine toxicity mainly includes neurological manifestations such as dizziness, tinnitus, convulsions, cardiac manifestations such as bradycardia, new severe atrioventricular block and so on.

The incidence of moderate to severe pain at 24、48 and 72 hours after surgery at rest and during movement;

he pain is evaluated using numerical rating scale（NRS). NRS scores range from 0 to 10 points, with 0 points representing no pain, 1-3 points representing mild pain, 4-6 points representing moderate pain, 7-9 points representing severe pain and 10 points representing the strongest pain.

The days of hospital stay after the operation were calculated from the first day after the operation to the days of discharge.

(satisfaction scores regarding pain control and the overall recovery process were obtained at 72 hours after surgery, using a 11-point Likert scale, with 0 indicating "very dissatisfied"and10 indicating "very satisfied"

Inclusion Criteria: Age: 18-70 years old American Society of Anesthesiologists(ASA) Ⅰ～III BMI≤30 Intended for open liver resection Exclusion criteria：1. Long-term opioid users 2. Patients with contraindications or allergies to any drugs (lidocaine, etc.) used in this study 3. Patients with severe hepatic insufficiency before surgery (defined as total bilirubin>1.46mg/dl), renal insufficiency (glomerular filtration rate <30ml/min/1.73m2 or end-stage renal disease) 4. Associated with severe heart disease (second or third degree atrioventricular block); severe heart failure (ejection fraction <50%); sinus bradycardia; patient 6. Patients who participated in other clinical trials within 3 months before enrollment in the study.