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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...
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...
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.
Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

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Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
Sigmoidoscopy
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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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Updated: May 13, 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

Potential anesthesia protocols for space exploration missions.

Matthieu Komorowski1, Sharmila D Watkins, Gilles Lebuffe

  • 1Department of Anaesthesiology and Intensive Care Medicine, University Hospital of Lille, Lille, France. matthieu.komorowski@gmail.com

Aviation, Space, and Environmental Medicine
|March 22, 2013
PubMed
Summary
This summary is machine-generated.

Safe anesthesia for space exploration is critical. This study details ketamine-based protocols, addressing challenges of microgravity and limited resources for surgical care during long-duration spaceflights.

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Area of Science:

  • Aerospace Medicine
  • Anesthesiology
  • Surgical Care

Background:

  • Surgical conditions pose risks to crew health and mission success in spaceflight beyond low Earth orbit.
  • Anesthesia research for exploration missions is limited, presenting a significant challenge for astronaut care.
  • Current research focuses on surgical techniques, but anesthesia protocols require dedicated investigation.

Purpose of the Study:

  • To describe specific anesthesia procedures for treating pre-identified surgical conditions during exploration missions.
  • To identify the most appropriate anesthesia techniques considering NASA's Exploration Medical Capability requirements.
  • To propose safe and effective anesthesia protocols adaptable to the constraints of spaceflight.

Main Methods:

  • Identification of surgical conditions relevant to NASA's Human Research Program.
  • Discussion of appropriate anesthesia procedures for each identified condition.
  • Development of ketamine-based anesthesia protocols considering microgravity physiology and mission constraints.

Main Results:

  • Ketamine offers advantages like cardiovascular stability, airway protection, and spontaneous ventilation, with recent developments mitigating side effects.
  • Ketamine's safety is confirmed by extensive use in remote and austere terrestrial environments.
  • Two ketamine-based anesthesia protocols are presented with specific indications for space exploration.

Conclusions:

  • Ketamine-based anesthesia protocols can provide safe and effective surgical care during long-duration spaceflights.
  • These protocols address the unique physiological changes and logistical constraints of microgravity environments.
  • The findings have potential terrestrial applications for anesthesia in isolated or austere settings.