Unlabelled: N-methyl-D-aspartate (NMDA) antagonists, such as MK801, delay the development of morphine tolerance. Magnesium, a noncompetitive NMDA antagonist, reduces postoperative morphine requirements. The present study was designed to evaluate the effects of intrathecal co-administration of magnesium sulfate with morphine on antinociceptive potentiation, tolerance, and naloxone-induced withdrawal signs. Magnesium sulfate (40-60 microg/h) co-administration for 7 days, similar to MK801 (10 nmol/h), prevented the decline in antinociceptive response compared with morphine (20 nmol/h). Magnesium sulfate (60 microg/h) produced no antinociception, but co-infused with morphine (1 nmol/h), it resulted in potentiated antinociception compared with morphine throughout the 7-day period. Probe morphine doses after 7-day infusions demonstrated a significantly greater 50% effective dose value for morphine 1 nmol/h (109.7 nmol) compared with saline (10.9 nmol), magnesium sulfate 60 microg/h (10.9 nmol), and magnesium sulfate 60 microg/h plus morphine 1 nmol/h (11.2 nmol), which indicates that magnesium had delayed morphine tolerance. Morphine withdrawal signs after naloxone administration were not altered by the co-infusion of magnesium sulfate. Cerebrospinal fluid magnesium levels after intrathecal magnesium sulfate (60 microg/h) for 2 days increased from 17.0 +/- 1.0 microg/mL to 41.4 +/- 23.6 microg/mL, although serum levels were unchanged. This study demonstrates antinociceptive potentiation and delay in the development of morphine tolerance by the intrathecal coinfusion of magnesium sulfate and morphine in the rat.
Implications: The addition of magnesium sulfate, an N-methyl-D-aspartate antagonist, to morphine in an intrathecal infusion provided better analgesia than morphine alone in normal rats. These results suggest that intrathecal administration of magnesium sulfate may be a useful adjunct to spinal morphine analgesia.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/00000539-199804000-00028 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of intraoperative magnesium sulphate on acute kidney injury following robot-assisted radical prostatectomy: a retrospective propensity score-matched analysis.
Magnes Res
January 2025
Department of Anaesthesiology & Pain Medicine, Seoul National University Bundang Hospital, Seongnam 13620, Korea, Department of Anaesthesiology & Pain Medicine, Seoul National University College of Medicine, Seoul 03080, Korea.
Although intraoperative magnesium sulphate administration has various advantages, its influence on the occurrence of postoperative acute kidney injury (AKI) remains unclear, particularly in patients undergoing robot-assisted radical prostatectomy (RARP). The steep Trendelenburg position and a high intra-abdominal pressure can render patients susceptible to AKI after surgery. This study aimed to evaluate the effects of intraoperative magnesium sulphate administration on postoperative AKI in patients who underwent RARP.
View Article and Find Full Text PDFPersistent Thrombocytopenia of an Unexplained Cause in a Patient With Metastatic Renal Cell Carcinoma: A Case Report.
Cureus
December 2024
Surgical Oncology, Mahamana Pandit Madan Mohan Malaviya Cancer Centre, Homi Bhabha Cancer Hospital, Tata Memorial Centre, Varanasi, IND.
Thrombocytopenia is a common complication in patients with solid tumors, particularly renal cell carcinoma (RCC), arising from mechanisms such as chemotherapy, direct tumor invasion, and paraneoplastic syndromes. Managing thrombocytopenia in advanced cancer presents significant challenges, often limiting therapeutic options and impacting patient outcomes. This case report describes a 62-year-old man with metastatic RCC complicated by persistent thrombocytopenia, unresponsive to both conventional treatments and novel therapies.
View Article and Find Full Text PDFComparative analysis of correlation and causality inference in water quality problems with emphasis on TDS Karkheh River in Iran.
Sci Rep
January 2025
School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran.
Water quality management is a critical aspect of environmental sustainability, particularly in arid and semi-arid regions such as Iran where water scarcity is compounded by quality degradation. This study delves into the causal relationships influencing water quality, focusing on Total Dissolved Solids (TDS) as a primary indicator in the Karkheh River, southwest Iran. Utilizing a comprehensive dataset spanning 50 years (1968-2018), this research integrates Machine Learning (ML) techniques to examine correlations and infer causality among multiple parameters, including flow rate (Q), Sodium (Na), Magnesium (Mg), Calcium (Ca), Chloride (Cl), Sulfate (SO), Bicarbonates (HCO), and pH.
View Article and Find Full Text PDFSevere phlebitis and cutaneous necrosis following peripheral administration of high-concentration potassium chloride: A case report and vascular access management implications.
Sci Prog
January 2025
Department of Hepatobiliary Surgery, Liaoning Cancer Hospital & Institute, Cancer Hospital of China Medical University, Shenyang, China.
Electrolyte imbalance management is crucial in diverse clinical scenarios, with intravenous potassium repletion often required. High-concentration infusions can pose severe complications if extravasation occurs, leading to phlebitis, local tissue damage, or in severe cases, cutaneous necrosis. This risk is elevated in geriatric patients due to factors like reduced tissue elasticity and sensitivity.
View Article and Find Full Text PDFComparative study of inactivation efficacy of far-UVC (222 nm) and germicidal UVC (254 nm) radiation against virus-laden aerosols of artificial human saliva.
Photochem Photobiol
January 2025
Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India.
Virus-laden aerosols play a substantial role in the spread of numerous infectious diseases, particularly in enclosed indoor settings. Ultraviolet-C (UVC) disinfection is known to be a highly efficient method for disinfecting pathogenic airborne viruses. Recent recommendations suggest using far-UVC radiation (222 nm) emitted by KrCl* (krypton-chloride) excimer lamps to disinfect high-risk public spaces due to lower exposure risks than low-pressure (LP) mercury lamps (254 nm).
View Article and Find Full Text PDFWant 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!