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Context-sensitive half-life or context sensitive half-time is defined as the time taken for blood plasma concentration of a drug to decline by one half after an infusion designed to maintain a steady state (i.e. a constant plasma concentration) has been stopped. The "context" is the duration of infusion.
To induce general anesthesia, propofol is the drug used almost exclusively, having largely replaced sodium thiopental. [13]It is often administered as part of an anesthesia maintenance technique called total intravenous anesthesia, using either manually programmed infusion pumps or computer-controlled infusion pumps in a process called target controlled infusion (TCI).
Remifentanil's short context-sensitive half-life makes it ideal for intense pain of short duration. As such, it has been used for analgesia in labor successfully; however, it is not as effective as epidural analgesia. [10] In combination with propofol, remifentanil is used for anesthesia of patients undergoing electroconvulsive therapy. [11]
0.05 (3–6 min context-sensitive half-life; 7–18 min elimination half-life) Instantaneously (from 5 to 15 sec) 15 minutes; rapid offset of effects necessitates continuous infusion for maintenance of anesthesia Protonitazene: 200 50 μg Ocfentanil: 125–250 40–80 μg Ro4-1539: 240–480 20–40 μg Isotonitazene: 500 20 μg Sufentanil: 500 ...
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Fospropofol is a prodrug of propofol; as an organophosphate it is metabolized by alkaline phosphatases to phosphate and formaldehyde and the active metabolite, propofol. Pharmacodynamics [ edit ]
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