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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...

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...

Parenteral Anesthetics: Overview

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.

Local Anesthetics: Adverse Effects

Local Anesthetics: Adverse Effects

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...

Inhalational Anesthetics: Overview

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...

Local Anesthetics: Clinical Application as Spinal Anesthesia

Local Anesthetics: Clinical Application as Spinal Anesthesia

Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...

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Related Experiment Video

Updated: May 11, 2026

Adaptation of Microelectrode Array Technology for the Study of Anesthesia-induced Neurotoxicity in the Intact Piglet Brain

Adaptation of Microelectrode Array Technology for the Study of Anesthesia-induced Neurotoxicity in the Intact Piglet Brain

Published on: May 12, 2018

[Does anesthesia harm children's brain?].

Karin Becke¹, Christian Siebert, Michael Dinkel

¹Abteilung für Anästhesie und Intensivmedizin der Cnopf'schen Kinderklinik / Klinik Hallerwiese in Nürnberg. Karin.Becke@diakonieneuendettelsau.de

Anasthesiologie, Intensivmedizin, Notfallmedizin, Schmerztherapie : AINS

|May 2, 2013

Summary

This summary is machine-generated.

Concerns exist regarding anesthetic exposure and developing brain damage, but current evidence does not support changes in routine practice. Further research is needed to understand potential effects in humans.

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Adaptation of Microelectrode Array Technology for the Study of Anesthesia-induced Neurotoxicity in the Intact Piglet Brain

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Published on: May 12, 2018

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Published on: January 20, 2023

Area of Science:

Anesthesiology
Neuroscience
Developmental Biology

Context:

Animal studies suggest potential links between anesthetic exposure and long-term damage to the developing brain.
This has generated significant concern among anesthesiologists, patients, parents, and the media.
Existing literature lacks conclusive evidence to alter current anesthetic protocols.

Purpose:

To evaluate the current scientific literature regarding the effects of anesthetic exposure on the developing brain.
To determine if existing evidence warrants changes in routine anesthetic practices.
To highlight the need for further basic and clinical research.

Summary:

Current animal data raises concerns about anesthetic exposure and developing brain damage.
However, a comprehensive evaluation of the available literature does not provide evidence to change routine anesthetic practices.
The findings underscore the necessity for more research into the mechanisms and human effects.

Impact:

Highlights a critical area of ongoing scientific and public concern.
Informs the anesthesiology community about the current evidence base.
Emphasizes the need for future research to establish definitive human data on anesthetic neurotoxicity.