The current study was initiated to evaluate the epidural anesthetic properties of 0.5%, 0.75%, and 1.0% ropivacaine, a new local anesthetic agent structurally similar to bupivacaine. Fifteen patients scheduled for lower limb orthopedic surgery were enrolled in the study. As the concentration of ropivacaine increased from 0.5% to 1.0%, the time to onset of sensory anesthesia decreased from 6.4 +/- 1.7 (SD) min to 2.4 +/- 0.6 min and the maximum level of sensory anesthesia increased from T6 to T1. These changes were not statistically significant. Time to regression of anesthesia to T12 increased from 255 +/- 73 min with the 0.5% solution to 356 +/- 75 min with 1.0% ropivacaine (P less than 0.05). The degree of motor blockade using the Bromage scale varied with the concentration. When the 0.5% concentration was used, only one patient (20%) had greater than 1+ motor blockade. However, all of the patients receiving the 0.75% or 1.0% solution had at least 2+ motor blockade. Sensory anesthesia was adequate for surgery in 14 of the 15 patients. The mean peak plasma concentration of ropivacaine (Cmax) increased from 0.65 +/- 0.15 micrograms/mL with the 100-mg dose to 1.30 +/- 0.43 microgram/mL with the 200-mg dose. No adverse effects were noted in any patient in the study. These initial studies in humans suggest that ropivacaine provides satisfactory sensory anesthesia with minimal motor blockade at a concentration of 0.5%. An increase in concentration resulted in a more profound motor blockade. The Cmax of ropivacaine in this study was below levels associated with toxicity in animal studies.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1213/00000539-199001000-00014 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Comparison of Intrathecal Dexmedetomidine and Fentanyl as Adjuvants to 0.5% Hyperbaric Levobupivacaine for Lower Abdominal Surgeries: A Prospective, Double-Blinded, Randomized Controlled Trial.
Cureus
December 2024
Department of Anaesthesiology and Critical Care, Pacific Medical College and Hospital, Udaipur, IND.
Background Due to its affordability and ease of application, the subarachnoid block is the most frequently used method for lower abdominal procedures. Levobupivacaine has an onset of sensory and motor blockade comparable to that of bupivacaine and prolongs the duration of analgesia while facilitating quick recovery from motor block. Fentanyl and dexmedetomidine, when used as additives to intrathecal local anesthetic, can extend the duration of sensory and motor blockade and enhance postoperative analgesia.
View Article and Find Full Text PDFBlockade of mGluR1 and mGluR5 in the lateral habenula produces the opposite effects in the regulation of depressive-like behaviors in the hemiparkinsonian rats.
Exp Neurol
January 2025
Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an 710061, China. Electronic address:
Depression is one of the most common non-motor symptoms in Parkinson's disease (PD) and the hyperactivity of the lateral habenula (LHb) may contribute to depression. The present study was performed to investigate the effects and mechanisms of group I metabotropic glutamate receptors (mGluRs) in the LHb on PD-related depressive-like behaviors. Unilateral 6-hydroxydopamine lesions of the substantia nigra pars compacta (SNc) were used to establish the PD rat model.
View Article and Find Full Text PDFUrinary retention during and after labor with programmed intermittent epidural bolus (PIEB) analgesia: a prospective observational study.
Int J Obstet Anesth
January 2025
Department of Obstetrics and Gynecology, Ikazia Hospital, the Netherlands. Electronic address:
Background: This study investigates the incidence and risk factors for urinary retention during and after labor in women receiving programmed intermittent epidural bolus (PIEB) analgesia and evaluates the optimal bladder management strategy.
Methods: This prospective observational study assessed urinary retention during voiding attempts every two to three hours during labor and postpartum, among women with labor epidural analgesia using PIEB. Urinary retention was defined as a post-void residual volume >150 mL, determined by catheterization after spontaneous voiding.
Safety, tolerability, pharmacokinetic, and pharmacodynamic of CZ1S injection for unilateral brachial plexus blockade in healthy Chinese adults: Double-blind, randomized, positive-controlled Phase I study.
J Pharm Sci
January 2025
Center of Clinical Pharmacology, the Second Affiliated Hospital Zhejiang University School of Medicine, Hangzhou 310009, China. Electronic address:
CZ1S injection is a novel, extended-release local anaesthetic formulation of ropivacaine, classified as a type 2.2 new drug, with potential for post-operative analgesia by subcutaneous infiltration and peripheral nerve blockade. This study aimed to validate the superior properties of CZ1S over ropivacaine hydrochloride injection and to evaluate the safety, tolerability, pharmacokinetic (PK) and pharmacodynamic (PD) profiles of a single dose of brachial plexus block with CZ1S in healthy Chinese adults.
View Article and Find Full Text PDFA Clinical Comparative Study of Dexmedetomidine, Dexamethasone, and Clonidine as Adjuvants to Local Anesthetics in Supraclavicular Brachial Plexus Blocks.
Cureus
December 2024
Anaesthesiology, Gajra Raja Medical College, Jaya Arogya Group of Hospitals, Gwalior, IND.
Introduction: The brachial plexus block is one of the peripheral blocks, beneath which the majority of upper limb surgical procedures are carried out. During upper limb surgery, a supraclavicular nerve block is an excellent substitute for general anesthesia.
Aim: This is a clinical comparative study of dexmedetomidine, dexamethasone, and clonidine as adjuvants to local anesthetics in supraclavicular brachial plexus block.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!