Articles: acetaminophen.
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Clinical Trial
Median effective dose (ED50) of paracetamol and morphine for postoperative pain: a study of interaction.
Paracetamol is widely used to treat postoperative pain and is well known for its morphine-sparing effect. Therefore, the effect of morphine-paracetamol combination can be synergistic, additive, or infra-additive. The primary aim of our study is to define the median effective analgesic doses (ED₅₀s) of paracetamol, morphine, and the combination of both. Also, the nature of the interaction for postoperative pain after moderately painful surgery using an up-and-down method and isobolographic analysis was determined. ⋯ Our study showed that the combination of the paracetamol and morphine produces an additive analgesic effect. Clinical trial registration NCT01366313.
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Pharmacokinetic estimates for intravenous paracetamol in individual adult cohorts are different to a certain extent, and understanding the covariates of these differences may guide dose individualization. In order to assess covariate effects of intravenous paracetamol disposition in adults, pharmacokinetic data on discrete studies were pooled. ⋯ Size and age are important covariates for paracetamol pharmacokinetics explaining approximately 40% of clearance and V2 variability. Dose individualization in adult subpopulations would achieve little benefit in the scenarios explored.
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Randomized Controlled Trial Comparative Study
Paracetamol vs dexketoprofen for perineal pain relief after episiotomy or perineal tear.
A randomised controlled trial was conducted to investigate efficacy of paracetamol and dexketoprofen trometamol for perineal pain relief after perineal repair. Subjects were randomly assigned to receive two doses of either 50 mg of intravenous dexketoprofen trometamol via slow i.v. infusion (Group I, n = 49) or 1,000 mg of paracetamol via intravenous infusion (Group II, n = 46). The main outcome measure was a VAS (visual analogue scale) for pain recorded at 1 h (VAS 1). ⋯ There was no difference among groups in terms of pain scores at the beginning (VAS 0). The pain was decreased in 70% of the patients in Group I and in 62% of the patients in Group II (p = 0.502). Both paracetamol and dexketoprofen are effective in perineal pain relief after episiotomy or perineal tear repair.
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This was judged to be the first place winning submission for the American Dental Society of Anesthesiology Student Essay Award. Acetaminophen is an old drug that is now available in an intravenous formulation. Its advantages and disadvantages are reviewed, including its potential role in multimodal postoperative pain therapy.
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Clin J Am Soc Nephrol · Jan 2014
ReviewAcetaminophen toxicity and 5-oxoproline (pyroglutamic acid): a tale of two cycles, one an ATP-depleting futile cycle and the other a useful cycle.
The acquired form of 5-oxoproline (pyroglutamic acid) metabolic acidosis was first described in 1989 and its relationship to chronic acetaminophen ingestion was proposed the next year. Since then, this cause of chronic anion gap metabolic acidosis has been increasingly recognized. Many cases go unrecognized because an assay for 5-oxoproline is not widely available. ⋯ This cycle is activated by the depletion of both glutathione and cysteine. This explanation contributes to our understanding of acetaminophen-induced 5-oxoproline metabolic acidosis and the beneficial role of N-acetyl cysteine therapy. The ATP-depleting futile 5-oxoproline cycle may also play a role in the energy depletions that occur in other acetaminophen-related toxic syndromes.