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Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
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The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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Related Experiment Video

Updated: Dec 5, 2025

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
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Explaining anaesthetic hysteresis with effect-site equilibration.

Alex Proekt1, Max B Kelz1

  • 1Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

British Journal of Anaesthesia
|October 21, 2020
PubMed
Summary
This summary is machine-generated.

Anaesthetic hysteresis, observed in animal studies, is debated in humans. This study shows that drug equilibration models can mask hysteresis, but neuronal dynamics may also cause it.

Keywords:
effect-site concentrationhysteresismechanisms of anaesthesiamodellingpharmacokinetics

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Mathematical Modeling

Background:

  • Animal studies suggest higher anesthetic concentrations are needed for induction than emergence, a phenomenon known as anesthetic hysteresis.
  • Evidence for anesthetic hysteresis in humans is conflicting, potentially due to differing modeling approaches for drug equilibration.
  • The 'effect-site' is a theoretical compartment, making direct measurement of drug concentration impossible and complicating hysteresis analysis.

Purpose of the Study:

  • To investigate whether drug equilibration models can adequately explain anesthetic hysteresis.
  • To explore the role of neuronal dynamics in contributing to anesthetic hysteresis.
  • To determine if anesthetic hysteresis is solely a function of drug equilibration kinetics.

Main Methods:

  • Construction of computational models to simulate anesthetic drug dynamics.
  • Development of a model lacking hysteresis beyond effect-site equilibration.
  • Development of a model where neuronal dynamics contribute to hysteresis.
  • Attempting to differentiate between models using drug equilibration principles.

Main Results:

  • Modeling demonstrated that effect-site equilibration models can be constructed to eliminate observed hysteresis.
  • Experimental indistinguishability between correct and hysteresis-collapsing models when effect-site concentrations are unmeasurable.
  • Hysteresis can emerge intrinsically within simple neuronal networks, independent of drug equilibration.

Conclusions:

  • Effect-site equilibration models can inadvertently obscure anesthetic hysteresis.
  • The presence of hysteresis does not exclusively indicate drug equilibration kinetics as the sole cause.
  • Neuronal network dynamics represent a potential alternative or contributing mechanism for anesthetic hysteresis.