Awakening after sodium thiopental is mainly determined by which factor?

Awakening after sodium thiopental is mainly determined by which factor?

• A. Metabolism rate only
• B. Redistribution
• C. Kidney elimination
• D. Time of day

Answer: (B)

Awakening after a thiopental bolus is governed by redistribution from the brain to other tissues. Thiopental is highly lipid-soluble and rapidly crosses into the brain to produce unconsciousness. However, it then leaves the brain quickly and distributes into muscle and fat. This rapid movement lowers the drug’s concentration in the brain below the level needed to keep you asleep, so consciousness returns even though the drug is still present elsewhere in the body. Metabolism and elimination do contribute to overall clearance, but they are slower processes and don’t drive the quick wake-up after a single dose. Time of day has no effect on the awakening.

Awakening after a thiopental bolus is governed by redistribution from the brain to other tissues. Thiopental is highly lipid-soluble and rapidly crosses into the brain to produce unconsciousness. However, it then leaves the brain quickly and distributes into muscle and fat. This rapid movement lowers the drug’s concentration in the brain below the level needed to keep you asleep, so consciousness returns even though the drug is still present elsewhere in the body. Metabolism and elimination do contribute to overall clearance, but they are slower processes and don’t drive the quick wake-up after a single dose. Time of day has no effect on the awakening.