Dataset Information

Population pharmacokinetic model of free and total ropivacaine after transversus abdominis plane nerve block in patients undergoing liver resection.

ABSTRACT:

Aims

The aim of this study was to develop a pharmacokinetic model in order to characterize the free and total ropivacaine concentrations after transversus abdominis plane block in a population of patients undergoing liver resection surgery. In particular, we evaluated the impact of the size of liver resection on ropivacaine pharmacokinetics.

Methods

This work is based on a single-centre, double-blinded, randomized, placebo-controlled study. Among the 39 patients included, 19 patients were randomized to the ropivacaine group. The free and total ropivacaine concentrations were measured in nine or 10 blood samples per patient. A pharmacokinetic model was built using a nonlinear mixed-effect modelling approach.

Results

The free ropivacaine concentrations remained under the previously published toxic threshold. A one-compartment model, including protein binding site with a first-order absorption, best described the data. The protein binding site concentration was considered as a latent variable. Bodyweight, the number of resected liver segments and postoperative fibrinogen evolution were, respectively, included in the calculation of the volume of distribution, clearance and binding site production rate. The resection of three or more liver segments was associated with a 53% decrease in the free ropivacaine clearance.

Conclusions

Although large liver resections were associated with lower free ropivacaine clearance, the ropivacaine pharmacokinetic profile remained within the safe range after this type of surgery.

SUBMITTER: Ollier E

PROVIDER: S-EPMC4500326 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature

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Publications

Population pharmacokinetic model of free and total ropivacaine after transversus abdominis plane nerve block in patients undergoing liver resection.

Ollier Edouard E Heritier Fabrice F Bonnet Caroline C Hodin Sophie S Beauchesne Brigitte B Molliex Serge S Delavenne Xavier X

British journal of clinical pharmacology 20150528 1

<h4>Aims</h4>The aim of this study was to develop a pharmacokinetic model in order to characterize the free and total ropivacaine concentrations after transversus abdominis plane block in a population of patients undergoing liver resection surgery. In particular, we evaluated the impact of the size of liver resection on ropivacaine pharmacokinetics.<h4>Methods</h4>This work is based on a single-centre, double-blinded, randomized, placebo-controlled study. Among the 39 patients included, 19 patie ...[more]

PMID: 25557141

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Project description:BACKGROUND:Pain has a wide spectrum of effects on the body and inadequately controlled postoperative pain may have harmful physiologic and psychological consequences and increase morbidity. In addition, opioid anesthetic agents in high doses can blunt endocrine and metabolic responses following surgery and are associated with side effects including dizziness, nausea, vomiting, constipation, and respiratory depression. OBJECTIVES:The current study aimed to investigate if unilateral ultrasound-guided transverse abdominal plane block (TAP-block) could reduce pain and postoperative use of patient requested analgesics following nephrectomy compared to local injection of the same ropivacaine dose in the surgical wound. PATIENTS AND METHODS:Retrospective chart reviews were performed in 42 consecutive patients who received TAP-block in conjunction with nephrectomy from November 2013 to August 2014 (group A). For comparison, data were used from 40 other nephrectomy patients registered as part of a previous study (group B). In this group the patients had received local ropivacaine injection in the surgical wound. On univariate analyses, the groups were compared by t-test and the Fisher exact test. Multivariate analyses were conducted by multiple linear regression. RESULTS:Mean surgical time was 162 minutes in group A and 92 minutes in group B (P < 0.0001). The means of visual analogue scale (VAS) were 3.05 and 1.55 in A and B groups, respectively (P = 0.001). The means of morphine consumption were 5.2 mg and 5.9 mg in groups A and B, respectively (P = 0.58); while the means of sufentanil use were 9.8 ?g and 6.0 ?g in groups A and B, respectively (P = 0.06). When controlling for age, tumor size and American society of anesthesiologists classification (ASA) score on multivariate analysis, TAP-block was associated with a significant increase in VAS (+1.4 [95% CI, 0.6 - 2.3], P = 0.001) and sufentanil use (+6.2 ?g [95% CI, 2.3 - 10.2], P = 0.003). There was no difference in morphine use on multivariate analysis (P = 0.99). CONCLUSIONS:TAP-block in conjunction with laparoscopic nephrectomy did not reduce pain or opioid consumption. On the contrary, it seemed to prolong surgical time.

Dataset Information

Population pharmacokinetic model of free and total ropivacaine after transversus abdominis plane nerve block in patients undergoing liver resection.

Aims

Methods

Results

Conclusions

Publications

Population pharmacokinetic model of free and total ropivacaine after transversus abdominis plane nerve block in patients undergoing liver resection.

Similar Datasets

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