Propofol in Anesthesia. Mechanism of Action, Structure-Activity Relationships, and Drug Delivery
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Propofol (2,6-diisopropylphenol) is becoming the intravenous anesthetic of choice for ambulatory surgery in outpatients. It is extensively metabolized, with most of the administered dose appearing in the urine as glucuronide conjugates. Favorable operating conditions and rapid recovery are claimed as the main advantages in using propofol, whereas disadvantages include a relatively high incidence of apnea, and blood pressure reductions. Besides a literature summary of the pharmacodynamics, pharmacokinetics, toxicology, and clinical use, this review provides a deeper discussion on the current understanding of mechanism of action and structure-activity relationships, and recent findings on drug delivery technologies as applied to the improvement of propofol formulations. The action of propofol involves a positive modulation of the inhibitory function of the neurotransmitter g-aminobutyric acid (GABA) through GABA A receptors. Recent results from recombinant human GABA A receptor experiments and findings from the work exploring the effects at other receptors (e.g., glycine, nicotinic, and M1 muscarinic receptors) are reviewed. Studies showing its antiepileptic and anxiolytic properties are also discussed. The structure-activity relationships (SAR) of series of alkylphenols and p-X-substituted congeners have been reinvestigated. Interestingly, unlike the other congeners tested sofar, p-iodo-2,6- diisopropylphenol displayed anticonvulsant and anticonflict effects, but not sedative-hypnotic and anesthetic properties. Due to its high lipid-solubility, propofol was initially formulated as a solution with the surfactant Cremophor EL, but the occurrence of pain on injection and anaphylactoid reactions prompted to search for alternative formulations. Results from using cyclodextrins, water-soluble prodrugs, and adopting Bodor ’ s approach to the site-specific chemical delivery system (CDS), as well as the advantages provided by computer-controlled infusion systems, are examined in some detail. Keywords: propofol, 2 diisoprovpylphenol, drug delivery, aminobutyric acid GABA, GABAa receptor, site specific chemical delivery system CDS, cloned GABA A Receptor, anticonvulsant, anxiolytic effects, alkylphenols, hypnotic activity, STERIMOL Descriptors, pharmacokinetic, drug monitoring, metabolism, toxicology, salmonella mutation, lipid formulations, saccharomices cerevisiae, prodrugs, chemical delivery systems CDS, target controlled infusion TCI, CLINICAL USE, Anesthesia, tomidate
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it