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General Anesthesia: Overview

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...

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...

Direct-Acting Cholinergic Agonists: Pharmacokinetics

Direct-Acting Cholinergic Agonists: Pharmacokinetics

Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...

Stages of General Anesthesia

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...

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...

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Related Experiment Video

Updated: Nov 8, 2025

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

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

Published on: October 16, 2013

Cholinergic Modulation of General Anesthesia.

Lai-Wo Stan Leung¹, Tao Luo²

¹Department of Physiology and Pharmacology, the University of Western Ontario, London, Ontario, Canada.

Current Neuropharmacology

|April 22, 2021

Summary

This summary is machine-generated.

Brain acetylcholine is crucial for arousal and cognition. Reduced acetylcholine function during anesthesia enhances its effects, while stimulating it aids recovery and may prevent postoperative cognitive deficits.

Keywords:

Medial septum acetylcholine cortical activation general anesthesia loss of righting reflex mesopontine brainstem.nucleus basalis postoperative cognitive disorder

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

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

Published on: January 13, 2018

Area of Science:

Neuroscience
Anesthesiology
Cognitive Science

Background:

Acetylcholine (ACh) in the brain supports arousal and cognitive functions, including cortical activation and hippocampal theta rhythm.
General anesthesia decreases ACh release, contributing to amnesia, loss of consciousness, and immobility.
Cholinergic deficits are implicated in cognitive decline associated with aging and Alzheimer's disease.

Purpose of the Study:

To explore the role of brain acetylcholine in general anesthesia and postoperative cognitive disorders.
To investigate how cholinergic system modulation affects anesthetic sensitivity and recovery.
To propose a cholinergic hypothesis for postoperative cognitive disorder.

Main Methods:

Review of animal experiments investigating the effects of cholinergic neuron inactivation, lesion, or genetic ablation on anesthetic sensitivity.
Analysis of studies on the impact of cholinergic stimulation on recovery from general anesthesia.
Examination of literature on anticholinesterase and cholinergic agonist effects on anesthesia and postoperative outcomes.

Main Results:

Inactivation or ablation of basal forebrain cholinergic neurons potentiates anesthetic effects and delays recovery in rodents.
Cholinergic stimulation in specific brain regions hastens emergence from general anesthesia.
Anticholinesterase agents show mixed success in accelerating anesthesia emergence.
Cholinergic deficits may underlie postoperative cognitive impairments, particularly in aged individuals.

Conclusions:

The brain's cholinergic system plays a critical role in regulating arousal, cognitive function, and response to anesthesia.
Modulating cholinergic activity offers potential therapeutic strategies for managing anesthetic effects and preventing postoperative cognitive deficits.
A cholinergic hypothesis for postoperative cognitive disorder is proposed, linking it to aging and Alzheimer's disease pathology.