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Heitmiller, Eugenie. "How Anesthesia Works." 01 April 2000. HowStuffWorks.com. <http://health.howstuffworks.com/anesthesia.htm> 09 May 2008.
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Injected Anesthetics
A liquid anesthetic drug is delivered to the brain by injecting it directly into the bloodstream, usually through an intravenous catheter. Examples of injected drugs are barbiturates, propofol, ketamine, and etomidate, as well as larger doses of narcotics (such as morphine) and benzodiazepines (Valium-like drugs). These drugs quickly reach the brain and their effect is dependent on several factors including the volume in which the drug is distributed in the body, the fat-solubility of the drug, and how quickly the body eliminates the drug.A commonly used injected barbiturate anesthetic is sodium thiopental, also known as Pentothal. This drug is fat-soluble and acts very quickly. If you receive sodium thiopental and then you are asked to count backward from 100 after the drug is injected, you probably won't remember counting past 95. Some injected anesthetics are used in low doses for sedation. A small dose of a narcotic or a benzodiazepine like Valium or Versed can significantly decrease anxiety. These drugs are used in these doses either as a premedication prior to general anesthesia or as "twilight sleep" or sedation when used in conjunction with local or regional anesthesia.
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Please copy/paste the following text to properly cite this How Stuff Works article:
Heitmiller, Eugenie. "How Anesthesia Works." 01 April 2000. HowStuffWorks.com. <http://health.howstuffworks.com/anesthesia.htm> 09 May 2008.
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