title: Is the pharmacokinetics of bupivacaine equivalent after lumbar epidural administration through a needle or a catheter in male and female adults?
abstract: We assessed possible pharmacokinetic modifications due to different epidural injection techniques using either a needle or a catheter. Adult patients (n=23) undergoing lower abdominal or lower extremity surgery were randomly assigned a single bupivacaine epidural injection anesthesia (0.5%, 15 mL, 0.3 mL/s) through needle or catheter device. Plasma bupivacaine concentration was quantified using a validated HPLC method and non-compartmental pharmacokinetic parameters estimated. CMAX and TMAX were similar in both groups: 952 ± 346 ng/mL, 0.65 ± 0.5 1h in the needle group; 810 ± 307 ng/mL, 0.43 ± 0.29 h in the catheter group respectively. Plasma AUC₀→∞ was also similar in both groups: 3868 ± 1687 ngh/mL for needle versus 4096 ± 1748 ngh/mL using catheter. The catheter group showed slower disposition than the needle group: t₁/₂=3.9 ± 2.3 h, MRT=6.0 ± 3.1 h versus 2.7 ± 1.03 h and 4.5 ± 1.2 h with needle administration respectively though it did not reach statistical significance, Cl/F and V/F were also similar. Lastly, female patients showed significant longer t1/2 after administration through catheter (5.7 ± 2.0 h) than needle (2.7 ± 0.6 h) group (P=0.0279). The device type does not affect the pharmacokinetics which is similar in both groups although sex-based differences might exist.
authors.affiliation: Department of Anesthesiology, Hospital of Viladecans, Avinguda de Gavà 38, 08840 Viladecans, Barcelona, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Faura
authors.affiliation: Clinical Pharmacy and Pharmacotherapy Unit, Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Barcelona, Avenue Joan XXIII s/n, 08028 Barcelona, Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Modamio
authors.affiliation: Department of Anesthesiology, Hospital of Viladecans, Avinguda de Gavà 38, 08840 Viladecans, Barcelona, Spain.
authors.forename: Domingo
authors.initials: D
authors.lastname: Blanco
authors.affiliation: Clinical Pharmacy and Pharmacotherapy Unit, Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Barcelona, Avenue Joan XXIII s/n, 08028 Barcelona, Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Segarra
authors.affiliation: Clinical Pharmacy and Pharmacotherapy Unit, Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Barcelona, Avenue Joan XXIII s/n, 08028 Barcelona, Spain.
authors.forename: Cecilia F
authors.initials: CF
authors.lastname: Lastra
authors.affiliation: Department of Anesthesiology, Hospital of Viladecans, Avinguda de Gavà 38, 08840 Viladecans, Barcelona, Spain.
authors.forename: Elisenda
authors.initials: E
authors.lastname: Izquierdo
authors.affiliation: Clinical Pharmacy and Pharmacotherapy Unit, Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Barcelona, Avenue Joan XXIII s/n, 08028 Barcelona, Spain.
authors.forename: Tomás
authors.initials: T
authors.lastname: Casasín
authors.affiliation: Clinical Pharmacy and Pharmacotherapy Unit, Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Barcelona, Avenue Joan XXIII s/n, 08028 Barcelona, Spain. Electronic address: emarino@ub.edu.
authors.forename: Eduardo L
authors.initials: EL
authors.lastname: Mariño
mesh_terms: D000368:Aged; D000779:Anesthetics, Local / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D019540:Area Under Curve; D002045:Bupivacaine / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D057785:Catheters; D005260:Female; D006207:Half-Life; D006801:Humans; D007268:Injections, Epidural; D008297:Male; D008875:Middle Aged; D009339:Needles; D012727:Sex Characteristics
chemical_list: D000779:Anesthetics, Local; D002045:Bupivacaine
keywords: Bupivacaine; Epidural anesthesia; Pharmacokinetics; Sex-based differences