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Related Concept Videos

Stages of General Anesthesia01:22

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...
Parenteral Anesthetics: Overview01:24

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.
General Anesthesia: Overview01:24

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...
Inhalational Anesthetics: Overview01:20

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 Epidural Anesthesia01:29

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...
Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

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 20, 2026

Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
14:52

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 deep anesthesia dangerous?].

B Drexler1, C Grasshoff

  • 1Sektion Experimentelle Anaesthesiologie, Klinik für Anästhesie und Intensivmedizin, Eberhard-Karls-Universität, Tübingen, Deutschland.

Der Anaesthesist
|July 14, 2012
PubMed
Summary
This summary is machine-generated.

Deep anesthesia, defined as bispectral index (BIS) < 45, may correlate with increased postoperative mortality. However, current evidence lacks randomized trials, so practice should not change.

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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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Area of Science:

  • Anesthesiology
  • Neuroscience
  • Critical Care Medicine

Context:

  • Anesthesiologists aim to prevent intraoperative awareness and explicit memory.
  • Recent research explores the link between deep anesthesia (BIS < 45) and postoperative mortality.
  • Four of five studies suggest a correlation, but study designs are suboptimal.

Purpose:

  • To evaluate the association between deep anesthesia and postoperative mortality.
  • To critically assess the existing evidence regarding deep anesthesia and patient outcomes.
  • To determine if current anesthetic practices require modification based on emerging data.

Summary:

  • Deep anesthesia, quantified by bispectral index (BIS) < 45, has been associated with increased postoperative mortality in recent observational studies.
  • The correlation is limited by non-randomized study designs and the ambiguity of causality versus epiphenomenon.
  • Patients with conditions like cancer may exhibit deeper cortical depression under general anesthesia, confounding results.

Impact:

  • Current evidence does not support altering anesthetic depth management protocols.
  • Further high-quality, randomized controlled trials are necessary to establish causality.
  • Understanding the relationship between anesthetic depth and mortality is crucial for patient safety and optimizing surgical outcomes.