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Propofol [7] is the active component of an intravenous anesthetic formulation used for induction and maintenance of general anesthesia. It is chemically termed 2,6-diisopropylphenol. It is chemically termed 2,6-diisopropylphenol.
Propofol – It is a highly lipid-soluble, GABA agonist. [15] The dosage is 1.5 mg/kg (usually 100 to 200 mg). It has quick onset of action, can cross the blood-brain barrier, wide tissue distribution, and can be hepatically cleared by the body quickly. [15] In the elderly, the rate of Propofol clearance is low.
Most propofol is conjugated in the liver with pharmacologically inactive metabolites. [33] Although it has a long terminal elimination half-life of 4 to 30 hours, plasma concentrations remain low after the typical induction dose. [33]
Commonly used intravenous induction agents include propofol, sodium thiopental, etomidate, methohexital, and ketamine. Inhalational anaesthesia may be chosen when intravenous access is difficult to obtain (e.g., children), when difficulty maintaining the airway is anticipated, or when the patient prefers it.
Injectable anaesthetics are used for the induction and maintenance of a state of unconsciousness. Anaesthetists prefer to use intravenous injections, as they are faster, generally less painful and more reliable than intramuscular or subcutaneous injections. Among the most widely used drugs are: Propofol; Etomidate
Propofol [6] is a non-barbiturate derivative that is thought to act by stimulating inhibitory GABA receptors and blocking excitatory NMDA receptors. It takes 40 seconds for the effects of propofol to kick in, and effects last six minutes. [3] Propofol has both sedative and amnestic effects, but provides no analgesia.
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Sodium thiopental is an ultra-short-acting barbiturate and has been used commonly in the induction phase of general anesthesia.Its use has been largely replaced with that of propofol, but may retain some popularity as an induction agent for rapid-sequence induction and intubation, such as in obstetrics. [12]