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Related Concept Videos

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: Mechanism of Action01:23

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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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Depolarizing Blockers: Pharmocokinetics01:19

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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Depolarizing Blockers: Mechanism of Action01:28

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

Local Anesthetics: Chemistry and Structure-Activity Relationship

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

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Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
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Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
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How ketamine works: An actionable hypothesis.

Roberto Malinow1

  • 1Department of Neurosciences and Section of Neurobiology, University of California at San Diego, La Jolla, CA 92093.

Proceedings of the National Academy of Sciences of the United States of America
|April 30, 2026
PubMed
Summary
This summary is machine-generated.

Ketamine effectively treats depression and suicidality in treatment-resistant patients. This new hypothesis suggests ketamine works by enhancing synaptic and circuit plasticity, potentially improving treatment efficacy.

Keywords:
NMDAdepressionketamine

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Pharmacology

Background:

  • Ketamine demonstrates efficacy in treating depression and suicidality, particularly in treatment-resistant cases.
  • The precise neurobiological mechanisms underlying ketamine's therapeutic effects remain largely unknown.

Purpose of the Study:

  • To propose a novel hypothesis for ketamine's mechanism of action.
  • To explore the potential role of synaptic and circuit plasticity in ketamine's antidepressant effects.

Main Methods:

  • This study is primarily theoretical, proposing a new hypothesis based on existing literature.
  • The hypothesis integrates concepts of synaptic plasticity and neural circuit function.

Main Results:

  • The proposed hypothesis posits that ketamine enhances synaptic plasticity.
  • It suggests that ketamine modulates neural circuits involved in mood regulation.
  • This mechanism may underlie its rapid antidepressant and anti-suicidal effects.

Conclusions:

  • Ketamine's efficacy may be attributed to its ability to promote synaptic and circuit plasticity.
  • This hypothesis offers a framework for further research into ketamine's therapeutic potential.
  • Understanding these mechanisms could lead to improved treatments for depression and other conditions.