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Validation of a method for estimating pulmonary dead space in ventilated beagles to correct exhaled propofol concentration in mixed air.
BMC Vet Res
January 2025
Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China.
Background: Mixed exhaled air has been widely used to determine exhaled propofol concentrations with online analyzers, but changes in dead space proportions may lead to inaccurate assessments of critical drug concentration data. This study proposes a method to correct propofol concentration in mixed air by estimating pulmonary dead space through reconstructing volumetric capnography (Vcap) from time-CO and time-volume curves, validated with vacuum ultraviolet time-of-flight mass spectrometry (VUV-TOF MS).
Methods: Existing monitoring parameters, including time-volume and time-CO curves, were used to determine Vcap.
Pharmacodynamic Model of the Hemodynamic Effects of Propofol and Remifentanil and Their Interaction with Noxious Stimulation.
Pharmaceutics
December 2024
Department of Pharmaceutical Sciences, School of Pharmacy and Nutrition, University of Navarra, 31008 Pamplona, Spain.
: Despite the known impact of propofol and remifentanil on hemodynamics and patient outcomes, there is a lack of comprehensive quantitative analysis, particularly in surgical settings, considering the influence of noxious stimuli. The aim of this study was to develop a quantitative semi-mechanistic population model that characterized the time course changes in mean arterial pressure (MAP) and heart rate (HR) due to the effects of propofol, remifentanil, and different types of noxious stimulation related to the clinical routine. : Data from a prospective study were used; the study analyzed the effects of propofol and remifentanil general anesthesia on female patients in physical status of I-II according to the American Society of Anesthesiologists (ASA I-II) undergoing gynecology surgery.
View Article and Find Full Text PDFAnesthetic and sedative drugs are small compounds known to bind to hundreds of proteins. One intriguing binding partner of propofol is the kinesin motor domain, kif5A, a neuronal mitochondrial transport protein. Here, we used zebrafish WT and kif5Aa KO larval behavioral assays to assess anesthetic sensitivity and combined that with zebrafish primary neuronal cell culture to probe for alteration in mitochondrial motility.
View Article and Find Full Text PDFComparison of Remimazolam-Flumazenil and Propofol on Psychomotor Function and Emergence Following General Anesthesia in Surgical Abortion: A Randomized Controlled Trial.
Drug Des Devel Ther
January 2025
Department of Anesthesiology, Ningbo No. 2 hospital, Ningbo, 315010, People's Republic of China.
Objective: This study aims to compare the recovery profiles of remimazolam combined with flumazenil against those of propofol in patients undergoing painless surgical abortion, focusing on psychomotor function and emergence. Rapid recovery and restoration of psychomotor function are critical for enhancing patient safety and satisfaction in outpatient procedures like surgical abortion.
Methods: A total of 110 patients scheduled for surgical abortion were randomly assigned to either the remimazolam group (Group R) or the propofol group (Group P) in a 1:1 ratio.
A propofol binding site in the voltage sensor domain mediates inhibition of HCN1 channel activity.
Sci Adv
January 2025
Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
Article Synopsis
- HCN ion channels play a key role in cellular activity and pain perception, with propofol acting as an analgesic by inhibiting their function.
- Researchers used a propofol analog to pinpoint binding sites on the human HCN1 isoform, revealing a specific pocket formed by certain residues in the channel.
- Mutations in this binding pocket affect propofol's ability to modulate HCN1 currents, highlighting its specific binding mechanism and offering insights for developing targeted HCN channel modulators.
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