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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...
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.
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...
Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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...

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Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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Defining depth of anesthesia.

S L Shafer1, D R Stanski

  • 1Department of Anesthesiology, Stanford University School of Medicine, 300 Pasteur Dr., Stanford, CA 94305A, USA. steven.shafer@stanford.edu

Handbook of Experimental Pharmacology
|January 5, 2008
PubMed
Summary
This summary is machine-generated.

Anesthetic depth is defined as the probability of non-response to stimuli. Achieving this requires a combination of hypnosis and analgesia for effective and safe anesthesia.

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Area of Science:

  • Anesthesiology
  • Pharmacology

Background:

  • Defining anesthetic depth is complex, involving multiple stimuli and responses.
  • Current methods lack a single, universally meaningful measure for anesthetic depth.

Purpose of the Study:

  • To define anesthetic depth based on the probability of non-response to calibrated stimuli.
  • To highlight the necessity of combining hypnotic and analgesic drug effects for optimal anesthesia.

Main Methods:

  • Defining anesthetic depth as a probability of non-response.
  • Calibrating responses against stimulus strength and drug concentrations.
  • Evaluating the independent and combined effects of hypnosis and analgesia.

Main Results:

  • No single stimulus-response measurement adequately captures anesthetic depth.
  • Hypnosis alone does not prevent responses to noxious stimuli.
  • A combination of hypnosis and analgesia ensures unconsciousness and suppresses hemodynamic responses.

Conclusions:

  • Anesthetic depth is best understood as a probability of non-response.
  • Both hypnosis and analgesia are essential components for achieving safe and effective anesthesia.
  • The synergistic effect of hypnosis and analgesia is critical for suppressing noxious stimuli responses and ensuring unconsciousness.