Articles: anesthetics.
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Clinical Trial Controlled Clinical Trial
Effect of extradural analgesia using bupivacaine and 2-chloroprocaine on intervillous blood flow during normal labour.
The effect of lumbar extradural analgesia on intervillous blood flow (IBF) during labour was studied in 26 healthy parturients using an i.v. bolus injection of xenon-133. There was a 19% decrease (n.s.) in mean IBF in six parturients (non-extradural control group). ⋯ This increase is statistically significant (P less than 0.05). The improvement in IBF after extradural block was considered to be a result of the decreased uterine vascular resistance, as no significant changes were observed in arterial pressure, uterine activity or uterine tone.
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Anesthesia and analgesia · Jul 1982
Pharmacokinetics of inhalation anesthetics: a three-compartment linear model.
The evolution of mathematical models of the uptake of the inhaled anesthetic agents has produced increasingly complex models in which researchers have attempted to incorporate more and more data on the effects of anesthetics on the processes of respiration, circulation, and metabolism. One result of this evolution has been to limit the application of these models due to the large amount of data required by the model and the need for a large digital computer to generate a solution. ⋯ Only a programmable hand calculator is needed for the solution. Due to the simplicity of this model, compared with previously described models, it should prove useful in understanding the kinetics of gas uptake by the body.