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Related Concept Videos

Inhalational Anesthetics: Overview01:20

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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...
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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...
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Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
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General Anesthesia: Overview01:24

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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.
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Oxygen therapy is critical to patient care, especially for those struggling with respiratory issues. This intervention increases the oxygen concentration in the lungs, enhancing the amount of oxygen transported to the body's tissues. One standard method of delivering supplemental oxygen is through a nasal cannula, a non-invasive device that provides low to medium oxygen concentrations.
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Related Experiment Video

Updated: Feb 23, 2026

Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
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Changes in Gas Composition during Low Flow Anaesthesia without Nitrous Oxide.

Ranjana Venkatachalapathy1, Anusha Cherian2, Sakthirajan Panneerselvam2

  • 1Junior Resident, Department of Anaesthesiology and Critical Care, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.

Journal of Clinical and Diagnostic Research : JCDR
|September 13, 2017
PubMed
Summary
This summary is machine-generated.

Using medical air and oxygen in low flow anesthesia is safe but increases analgesic needs and costs. This study compared oxygen-air versus nitrous oxide-oxygen mixtures for anesthesia safety and efficacy.

Keywords:
Anaesthetic agentEnvironmentFresh gas flow

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Area of Science:

  • Anesthesiology
  • Respiratory Medicine

Background:

  • Low flow anesthesia using Oxygen (O2) and Nitrous Oxide (N2O) mixtures poses a hypoxia risk.
  • Avoiding N2O increases analgesic and volatile anesthetic agent requirements.

Purpose of the Study:

  • To determine the lowest Fraction of inspired Oxygen (FiO2) with a 300 mL/min O2 and medical air mixture over two hours.
  • To compare analgesic requirements and costs between O2-medical air and N2O-O2 low flow anesthesia.

Main Methods:

  • Prospective observational study of 80 ASA Grade 1 and 2 patients undergoing general anesthesia.
  • Two groups received initial high Fresh Gas Flows (FGF) of 3 L/min, then reduced to 300 mL/min (Group O: O2-medical air; Group N: N2O-O2).
  • FiO2 < 0.3 was considered unsafe.

Main Results:

  • Lowest FiO2 recorded was 0.33 in Group O and 0.3 in Group N at two hours.
  • Mean analgesic requirement was significantly higher in Group O (151.85 μg) vs. Group N (124.85 μg) (p=0.004).
  • The O2-medical air combination resulted in a 62% cost increase.

Conclusions:

  • Low flow anesthesia with O2 and medical air (300 mL/min) following high FGF is a safe technique.
  • This combination increases anesthesia costs and the need for intra-operative analgesia.
  • N2O-O2 mixture remains more cost-effective and requires less analgesia.