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Related Concept Videos

Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

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While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
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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: Mechanism of Action01:23

Local Anesthetics: Mechanism of Action

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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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Local Anesthetics: Pharmacokinetics01:13

Local Anesthetics: Pharmacokinetics

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The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Excitatory and Inhibitory Effects of Neurotransmitters01:29

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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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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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Optogenetic Activation of Afferent Pathways in Brain Slices and Modulation of Responses by Volatile Anesthetics
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Anesthetic agent-specific effects on synaptic inhibition.

M Bruce MacIver1

  • 1From the Department of Anesthesia, Stanford School of Medicine, Palo Alto, California.

Anesthesia and Analgesia
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Summary
This summary is machine-generated.

Different anesthetics affect various types of γ-aminobutyric acid (GABA) synapses differently. This selectivity influences anesthetic action and suggests targets for developing new anesthetic agents.

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Area of Science:

  • Neuroscience
  • Anesthesiology
  • Pharmacology

Background:

  • Anesthetics modulate central nervous system inhibition via γ-aminobutyric acid (GABA).
  • Differential effects of anesthetics on tonic versus synaptic GABA receptors are known.
  • Selective engagement of distinct synaptic GABAergic pathways by anesthetics remains unclear.

Purpose of the Study:

  • To test the hypothesis that different GABA-mediated synapses exhibit varying anesthetic sensitivities.
  • To compare the effects of isoflurane, halothane, pentobarbital, thiopental, and propofol on synaptic inhibition.
  • To investigate anesthetic effects on glutamate-mediated facilitation.

Main Methods:

  • Experiments conducted on rat hippocampal brain slices.
  • Paired-pulse stimulation used to assess anesthetic effects on excitatory (glutamate) and inhibitory (GABA) inputs.
  • Agents applied at equieffective concentrations for population spike depression.

Main Results:

  • Anesthetics showed differential effects on paired-pulse facilitation at excitatory synapses.
  • Pentobarbital exhibited a novel presynaptic action on GABA inhibition.
  • All anesthetics depressed excitation, but GABA inhibition enhancement varied: propofol, thiopental, and pentobarbital strongly enhanced single-pulse inhibition, while isoflurane and halothane showed marginal effects.
  • Isoflurane and thiopental strongly enhanced paired-pulse inhibition, whereas propofol, pentobarbital, and halothane were less effective.

Conclusions:

  • Findings support the existence of distinct GABA receptor subtypes with varying anesthetic sensitivities.
  • Anesthetic selectivity for different GABA synapses explains unique clinical profiles.
  • Identified selective targets for the development of novel anesthetic agents.