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Parenteral Anesthetics: Overview01:24

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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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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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Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...
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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
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Anesthesia is a medical procedure that uses drugs for CNS suppression to enable painless surgeries and procedures. The selection of anesthetics is influenced by their pharmacokinetic properties, side effects, and patient characteristics. Various types of anesthesia include general, local, regional, spinal, and inhalational.
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Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
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Optimal BIS reference functions for closed-loop induction of anesthesia with propofol.

Ryan T Jarrett1, James L Blair2, Matthew S Shotwell1

  • 1Vanderbilt University Department of Biostatistics, 2525 West End Ave Ste 1100, Nashville, TN, 37203, USA.

Computers in Biology and Medicine
|March 5, 2022
PubMed
Summary

This study introduces a new framework for anesthesia induction, using a time-varying reference function instead of a fixed target. This method optimizes clinical outcomes and can personalize propofol dosing for better patient results.

Keywords:
AnesthesiologyClosed-loop controlOptimal design of experimentsPropofolTarget-controlled infusion

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Biomedical Engineering

Background:

  • Closed-loop anesthesia systems typically use fixed targets for rapid propofol induction.
  • Rapid inductions may not always be optimal, with slower approaches potentially improving patient outcomes in certain contexts.

Purpose of the Study:

  • To introduce a framework for optimizing clinical outcomes during closed-loop anesthesia induction.
  • To replace fixed reference points with parametric, time-varying reference functions for personalized anesthesia delivery.

Main Methods:

  • Developed a framework to define and optimize clinical outcomes (e.g., overshoot, time to target, propofol dosage).
  • Utilized parametric, time-varying reference functions optimized by objective functions encapsulating clinical goals.
  • Simulated closed-loop propofol inductions on synthetic patient populations, comparing reference functions to standard fixed-point targeting.

Main Results:

  • Optimized reference functions minimized the chosen outcome of interest in simulations.
  • The use of reference functions resulted in less variability between patients compared to standard methods.
  • Simulations demonstrated that reference functions can achieve clinical goals effectively, especially when induction speed is not the sole priority.

Conclusions:

  • A framework using time-varying reference functions offers a flexible approach to optimize closed-loop anesthesia induction.
  • This method allows for tailoring propofol administration to specific clinical goals and population variability.
  • Reference functions represent a promising strategy for improving patient outcomes in anesthesia induction beyond just speed.