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Inhalational Anesthetics: Overview01:20

Inhalational Anesthetics: Overview

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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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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.
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Sedatives and Hypnotics Drugs: Barbiturates01:20

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Sedatives and hypnotics encompass a drug class that acts on the central nervous system (CNS) to alleviate anxiety, promote relaxation and induce sleep.These drugs function by amplifying the actions of the neurotransmitter γ-aminobutyric acid (GABA), resulting in reduced neuronal activity. Barbiturates, a subset of sedatives and hypnotics first synthesized in the late 1800s, are categorized into ultra-short, short, intermediate, and long-acting groups based on their duration of effect. A...
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Drug Delivery: Enteral Route01:18

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The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
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Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
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Sedatives and Hypnotics Drugs: Benzodiazepines01:19

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Benzodiazepines have both sedative and hypnotic properties. They include compounds such as diazepam (Valium) and alprazolam (Xanax). Structurally, their cores are similar, consisting of the fusion of a benzene ring and a diazepine ring, but they share a common mechanism of action in the central nervous system (CNS).
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Related Experiment Video

Updated: Dec 31, 2025

Application of Dixon's Up-and-Down Design to Estimate the Minimum Alveolar Concentration of Sevoflurane in Rats with Refined Movement Classification
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Enflurane for controlled hypotension.

S Firn

    Postgraduate Medical Journal
    |September 1, 1983
    PubMed
    Summary

    Enflurane effectively replaced halothane for controlled hypotension in major surgeries. This anesthetic technique, combined with beta-blockade and ganglion blockade, produced good surgical conditions without adverse effects in plastic and neurosurgery patients.

    Area of Science:

    • Anesthesiology
    • Surgical Procedures

    Background:

    • Controlled hypotension is a technique used to reduce blood loss during surgery.
    • Halothane has been a traditional anesthetic agent for this procedure.
    • Evaluating alternative anesthetic agents is crucial for optimizing surgical conditions.

    Purpose of the Study:

    • To assess the efficacy and safety of enflurane as a substitute for halothane in controlled hypotension.
    • To evaluate the use of enflurane in combination with beta-blockade and sympathetic ganglion blockade.
    • To compare outcomes in patients undergoing different types of major surgery.

    Main Methods:

    • Enflurane was used instead of halothane in a controlled hypotension protocol.
    • The protocol included beta-blockade and sympathetic ganglion blockade.

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  • Two patient groups were studied: major plastic/maxillo-facial surgery (spontaneous breathing) and major neurosurgery (intermittent positive pressure ventilation).
  • Patients were monitored during anesthesia and for 24 hours postoperatively.
  • Main Results:

    • Enflurane facilitated controlled hypotension effectively in both patient groups.
    • Good operating conditions were achieved during the surgical procedures.
    • No adverse effects attributable to controlled hypotension were observed in any patient.

    Conclusions:

    • Enflurane is a safe and effective alternative to halothane for controlled hypotension in major plastic, maxillo-facial, and neurosurgery.
    • The technique, utilizing beta-blockade and ganglion blockade, is well-tolerated.
    • This anesthetic approach provides optimal surgical field conditions without compromising patient safety.