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Related Concept Videos

General Anesthesia: Overview01:24

General Anesthesia: Overview

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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.
General anesthesia induces unconsciousness in the whole body, while the others target specific areas or sensations. It is administered to minimize adverse effects, maintain...
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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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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

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Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
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Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
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Blind Procedures02:07

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Procedures for Evaluating the Adequacy of Anesthesia.

Mark van Gils1, Ilkka Korhonen1, Arvi Yli-Hankala2

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Summary

Monitoring anesthesia requires assessing hypnosis, analgesia, and neuromuscular transmission. While hypnosis and neuromuscular monitoring have advanced, reliably assessing pain relief (analgesia) remains challenging.

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Area of Science:

  • Anesthesiology and Neuroscience
  • Clinical Monitoring
  • Signal Processing in Medicine

Background:

  • Adequate anesthesia relies on evaluating hypnosis, analgesia, and neuromuscular transmission.
  • Various methods process different signals to assess these components.
  • Hypnosis involves central nervous system (CNS) cortical measures, analgesia targets subcortical/spinal CNS levels, and neuromuscular transmission is peripheral.

Purpose of the Study:

  • To provide an overview of current methods for measuring the components of anesthesia.
  • To highlight advancements and challenges in anesthesia monitoring techniques.

Main Methods:

  • Review of existing methods for assessing hypnosis, analgesia, and neuromuscular transmission.
  • Analysis of signal processing techniques for different physiological modalities.
  • Focus on electroencephalography (EEG), auditory evoked potentials, and motor nerve stimulation.

Main Results:

  • Significant progress in assessing hypnosis using EEG and auditory evoked potentials.
  • Objective monitoring of neuromuscular transmission is feasible with motor nerve stimulation.
  • Assessment of analgesia presents persistent challenges and requires further development.

Conclusions:

  • Hypnosis and neuromuscular transmission monitoring are well-established.
  • Reliable and objective assessment of analgesia remains a critical unmet need in anesthesia.
  • Further research is needed to develop effective methods for intraoperative pain assessment.