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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 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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Area of Science:

  • Critical Care Medicine
  • Anesthesiology
  • Neuroscience

Background:

  • Sedation is essential in intensive care units (ICUs) but optimal strategies remain unclear.
  • The impact of early sedation strategies on patient outcomes, especially delirium, requires further investigation.
  • Volatile anesthetic agents show promise for improved outcomes, but their role in delirium prevention is unknown.

Purpose of the Study:

  • To compare the efficacy of inhaled versus intravenous sedation strategies in mechanically ventilated ICU patients.
  • To assess the primary outcome of delirium occurrence using the Confusion Assessment Method for the ICU (CAM-ICU).
  • To evaluate secondary outcomes including cognitive and functional status at 3 and 12 months post-ICU discharge.

Main Methods:

  • Prospective, multicenter, randomized controlled trial involving 250 mechanically ventilated ICU patients.
  • Patients randomly assigned 1:1 to either an inhaled or intravenous sedation group.
  • Delirium assessed twice daily using CAM-ICU; cognitive and functional outcomes assessed at 3 and 12 months.

Main Results:

  • Primary outcome: Occurrence of delirium (CAM-ICU).
  • Secondary outcomes: Cognitive and functional outcomes at 3 and 12 months.
  • Study registered under NCT04341350.

Conclusions:

  • The study will provide critical data on the impact of different sedation strategies on patient outcomes in the ICU.
  • Findings may inform clinical practice guidelines regarding sedation in mechanically ventilated patients.
  • This research addresses a significant knowledge gap concerning volatile anesthetic agents and delirium prevention.