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Related Concept Videos

General Anesthesia: Overview01:24

General Anesthesia: Overview

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...
Stages of General Anesthesia01:22

Stages of General Anesthesia

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...
Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

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.
Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Inhalational Anesthetics: Overview01:20

Inhalational Anesthetics: Overview

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...
Sedatives and Hypnotics: Overview01:23

Sedatives and Hypnotics: Overview

Sedatives are drugs that alleviate anxiety, while hypnotics induce sleep. Both classes of medication suppress neuronal activity, leading to a calming effect for sedatives and facilitating sleep for hypnotics.
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...

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Updated: Jun 5, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Published on: October 16, 2013

Sleep and general anesthesia.

Nicholas P Franks1, Anna Y Zecharia

  • 1Biophysics Section, Blackett Laboratory, Division of Cell and Molecular Biology, Imperial College, South Kensington, London, SW7 2AZ, UK. n.franks@imperial.ac.uk

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

General anesthetics may cause loss of consciousness by acting on brain pathways that regulate natural sleep. This review explores the convergence of sleep and anesthesia mechanisms, focusing on GABAergic neurons and arousal systems.

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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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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
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Last Updated: Jun 5, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

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Published on: October 16, 2013

Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
14:52

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

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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
07:54

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

Published on: December 6, 2016

Area of Science:

  • Neuroscience
  • Anesthesiology
  • Sleep Medicine

Background:

  • General anesthetics induce reversible loss of consciousness through poorly understood mechanisms.
  • Understanding these mechanisms is crucial for improving anesthetic safety and efficacy.

Purpose of the Study:

  • To review evidence suggesting anesthetic-induced loss of consciousness may involve neuronal pathways responsible for natural sleep.
  • To explore the potential convergence of sleep and anesthesia mechanisms at the level of brain arousal systems.

Main Methods:

  • Review of existing literature on general anesthetics, electroencephalogram (EEG) findings during anesthesia and sleep.
  • Analysis of the role of gamma-aminobutyric acid (GABA)ergic neurons and GABA(A) receptors in sleep and anesthesia.
  • Examination of evidence for anesthetic effects on wake-active neurotransmitter systems (e.g., acetylcholine, histamine).

Main Results:

  • Anesthetics produce EEG effects similar to non-rapid eye movement (NREM) sleep.
  • GABAergic neurons, critical for NREM sleep, are a potential molecular target for anesthetics via GABA(A) receptors.
  • Modulation of wake-active neurotransmitter release impacts anesthesia, suggesting convergence at brain arousal systems.

Conclusions:

  • Anesthetics affect multiple points in sleep-wake circuitry, but true causal targets require further investigation.
  • Distinguishing non-specific arousal effects from causal anesthetic mechanisms presents a challenge.
  • Advanced experimental approaches are needed to elucidate fundamental mechanisms of sleep and anesthesia.