Which organ is NOT considered a member of the vessel-rich group?

Which organ is NOT considered a member of the vessel-rich group?

• A. Lungs
• B. Brain
• C. Heart
• D. Liver

Answer: (A)

The main idea tested is how IV anesthetics distribute in the body right after administration. Tissues that are in the vessel-rich group receive the most blood flow and thus take up drug very quickly, shaping the rapid onset of effects. The organs that fall into this group are the brain, heart, liver, and kidneys because they get the highest perfusion and have a high capacity to extract or retain drug early in the distribution phase. The lungs, despite receiving all the cardiac output, aren’t considered part of this group because they don’t act as a major reservoir for most IV agents; their role is primarily gas exchange and they don’t accumulate the drug to the same extent as the brain, heart, liver, or kidneys. So, the organ not in the vessel-rich group is the lungs.

The main idea tested is how IV anesthetics distribute in the body right after administration. Tissues that are in the vessel-rich group receive the most blood flow and thus take up drug very quickly, shaping the rapid onset of effects. The organs that fall into this group are the brain, heart, liver, and kidneys because they get the highest perfusion and have a high capacity to extract or retain drug early in the distribution phase. The lungs, despite receiving all the cardiac output, aren’t considered part of this group because they don’t act as a major reservoir for most IV agents; their role is primarily gas exchange and they don’t accumulate the drug to the same extent as the brain, heart, liver, or kidneys. So, the organ not in the vessel-rich group is the lungs.