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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...

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...

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...

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: 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...

Local Anesthetics: Clinical Application as Epidural Anesthesia

Local Anesthetics: Clinical Application as Epidural Anesthesia

Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...

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Related Experiment Video

Updated: May 30, 2026

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

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

Published on: January 13, 2018

Is anesthesia dangerous?

André Gottschalk¹, Hugo Van Aken, Michael Zenz

¹Universitätsklinikum der Ruhr-Universität Bochum.

Deutsches Arzteblatt International

|August 5, 2011

Summary

Anesthesia-related mortality has significantly decreased due to improved safety standards and training. Despite an apparent rise in mortality due to complex patient demographics and procedures, anesthetic management continues to enhance surgical outcomes.

Area of Science:

Anesthesiology
Perioperative Medicine
Patient Safety

Background:

Anesthesia-related mortality has seen an apparent increase in recent years.
This rise is attributed to an aging surgical population and more complex procedures.
Despite these challenges, anesthesiology quality remains high.

Purpose of the Study:

To review trends in anesthesia-related mortality.
To evaluate the impact of anesthetic management on surgical outcomes.
To assess the current state of anesthesiology care.

Main Methods:

A selective review of existing literature on anesthesia-related mortality.
Analysis of historical and current mortality data.
Evaluation of anesthetic management strategies.

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Non-Intubated Video-Assisted Thoracoscopic Surgery

Non-Intubated Video-Assisted Thoracoscopic Surgery

Published on: May 26, 2023

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Last Updated: May 30, 2026

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

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

Published on: January 13, 2018

Non-Intubated Video-Assisted Thoracoscopic Surgery

Non-Intubated Video-Assisted Thoracoscopic Surgery

Published on: May 26, 2023

Main Results:

Anesthesia-related mortality has dramatically decreased from 6.4/10,000 in the 1940s to 0.4/100,000 currently.
Improved safety standards and training are key drivers of this reduction.
Regional anesthesia can improve outcomes in major surgeries, and anesthetic management can reduce mortality even in high-risk patients.

Conclusions:

The apparent increase in anesthesia-associated mortality is due to demographic and procedural shifts, not a decline in care quality.
Anesthetic management plays a crucial role in improving surgical outcomes.
High-quality anesthesiology care is essential for managing complex surgical cases and improving patient safety.