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Related Concept Videos

Local Anesthetics: Mechanism of Action01:23

Local Anesthetics: Mechanism of Action

2.3K
Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
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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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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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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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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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Uncoupling immobility and unconsciousness.

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Related Experiment Video

Updated: Jul 19, 2025

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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Modulating anesthetic emergence with pathway-selective dopamine signaling.

Kathleen F Vincent1,2, Ken Solt1,2

  • 1Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital.

Current Opinion in Anaesthesiology
|August 8, 2023
PubMed
Summary

Dopamine pathways in the brain, specifically the mesolimbic and mesocortical pathways, are key to reversing anesthesia-induced unconsciousness. Targeting these dopamine circuits may accelerate emergence from general anesthesia.

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Area of Science:

  • Neuroscience
  • Anesthesiology

Background:

  • General anesthesia induces unconsciousness by altering brain activity.
  • Understanding the neurobiological mechanisms of anesthetic emergence is crucial for clinical practice.

Approach:

  • This review summarizes preclinical findings on dopaminergic circuits and their role in anesthetic emergence.
  • Studies involve manipulating cell type- and circuit-specific signaling pathways in rodent models.

Key Points:

  • Dopamine release from the ventral tegmental area to the nucleus accumbens promotes emergence from general anesthesia.
  • Mesocortical dopaminergic projections also hasten emergence, while the nigrostriatal pathway is not involved.
  • Dopamine D1 receptor-expressing neurons in the nucleus accumbens target the lateral hypothalamus and ventral pallidum.

Conclusions:

  • Dopamine is a potent modulator of general anesthesia.
  • Targeting specific arousal-promoting dopaminergic pathways, like the mesolimbic and mesocortical pathways, offers potential for accelerating anesthetic emergence.