General Anaesthetic General Relativity General Motors

Most commonly these two forms are combined, although it is possible to deliver anaesthesia soley by inhalation or injection.

Inhalational anaesthetic substances are either volatile liquids or gasses and are usually delivered using an anaesthesia machine. An anaesthesia machine allows composing a mixture of oxygen, anaesthetics and ambient air, delivering it to the patient and monitoring patient and machine parameters. Liquid anaesthetics are vaporized in the machine.

Many compounds have been used for inhalation anaesthesia, but only a few are still in widespread use. Desflurane and sevoflurane are the most widely used volatile anaesthetics today. They are often combined with nitrous oxide. Older, less popular, volatile anesthetics, include isofluraneIsoflurane (1-chloro-2,2,2-trifluoroethyl difluoromethyl ether) is a halogenated ether used for inhalation anesthesia. Together with enflurane and halothane it replaced the flammable ethers used in the pioneer days of surgery. Its use is now starting to d, halothaneHalothane vapour is an inhalational general anaesthetic. Its systematic name is 2-Bromo-2-chloro-1,1,1-trifluoroethane. Once widely used as general anaesthetic, it has largely been replaced by sevoflurane and isoflurane for human use. Halothane is still w, enflurane , and methoxyflurane . Researchers are also actively exploring the use of xenonXenon is a chemical element in the periodic table that has the symbol Xe and atomic number 54. A colorless, very heavy, odorless noble gas, xenon occurs in the earth's atmosphere in trace amounts and was part of the first noble gas compound synthesized. as an anaesthetic.

Injection anaesthetics are used for induction and maintenance of a state of unconsciousness. Anaesthetists prefer to use intravenous injection s as they are faster, less painful and more reliable than intramuscularIntramuscular injection is a route of administration for particular forms of medication which are administrated in small amounts. Depending on the chemical properties of the drug, the medication will be absorbed fairly quickly or gradually. Some medicatio or subcutaneous injections. Among the most widely used drugs are

1 Mechanism of action

Researchers agree that ion channels are the ultimate site of action of general anaesthetics, and are now determining the exact molecular mechanisms. However, the sites of action of general anaesthetics proved difficult to identify until the last decade. The wide variation in structure, ranging from complex steroids to the inert monatomic gas xenon, led to several now outdated theories of anaesthetic action.

It is now known that general anaesthetics act on the central nervous system by modifying the electrical activity of neurons at a molecular level by modifying the function of ion channels. This may occur by anaesthetic molecules binding directly to ion channels or by their disrupting the function of molecules that maintain ion channels.

Scientists have cloned forms of receptors in the past decade, adding greatly to knowledge of the proteins involved in neuronal excitability. These include:

voltage-gated ion channel s, such as sodium, potassium, and calcium channels
the ligand-gated ion channel superfamily and
the G protein-coupled receptor superfamily.

2 Related topics

Pharmacology Anesthesia

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1 Mechanism of action

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