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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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Stages of General Anesthesia01:22

Stages of General Anesthesia

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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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Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

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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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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

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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

Local Anesthetics: Clinical Application as Epidural Anesthesia

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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.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
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Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

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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.
One of the advantages of...
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Related Experiment Video

Updated: May 6, 2026

Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
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Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers

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Global field synchrony during general anaesthesia.

N Nicolaou1, J Georgiou

  • 1KIOS Research Centre, and Holistic Electronics Research Lab, Department of Electrical and Computer Engineering, University of Cyprus, Kallipoleos 75, CY-1678 Nicosia, Cyprus.

British Journal of Anaesthesia
|October 31, 2013
PubMed
Summary

Anesthesia alters brain activity synchronization, with global field synchrony (GFS) showing significant changes across various frequencies and locations. Gamma range activity exhibited the most consistent GFS decreases, indicating potential insights into anesthetic-induced unconsciousness.

Keywords:
anaesthesia, depth, measurement techniquesglobal field synchrony, monitoring, depth of anaesthesiamonitoring, electroencephalography

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Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
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Optogenetic Activation of Afferent Pathways in Brain Slices and Modulation of Responses by Volatile Anesthetics
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Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
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Optogenetic Activation of Afferent Pathways in Brain Slices and Modulation of Responses by Volatile Anesthetics
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Optogenetic Activation of Afferent Pathways in Brain Slices and Modulation of Responses by Volatile Anesthetics

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Area of Science:

  • Neuroscience
  • Anesthesiology
  • Signal Processing

Background:

  • Anesthetic agents are known to disrupt consciousness by interfering with long-range brain activity synchronization.
  • Investigating widespread and localized brain synchrony patterns during anesthesia is crucial for understanding its effects on consciousness.

Purpose of the Study:

  • To investigate the patterns of widespread and spatially localized brain synchrony during anesthesia using global field synchrony (GFS).
  • To identify specific frequency bands and brain regions where GFS changes are most pronounced under anesthesia.

Main Methods:

  • Electroencephalography (EEG) data from 29 patients undergoing routine surgery were analyzed using GFS.
  • GFS was calculated across multiple frequency bands (δ, θ, α1, α2, β1, β2, β3, γ1, γ2) and localized brain areas.
  • Statistical analysis (Wilcoxon rank-sum tests) compared GFS values between wakefulness and anesthesia states.

Main Results:

  • Anesthetic administration significantly altered GFS in all studied frequency ranges and electrode combinations.
  • Widespread synchrony increased in α2 and β1 bands, while decreasing in most other bands.
  • Localized synchrony decreased across all areas in the δ and γ2 bands, with notable changes in the central-right temporal region.

Conclusions:

  • Anesthesia induces significant frequency- and location-dependent changes in GFS, particularly evident in the gamma frequency range.
  • GFS analysis provides a valuable tool for detailed investigation into how specific frequency and spatial brain activity patterns relate to anesthetic-induced unconsciousness.