How much local anesthetic should be administered per spinal segment to patients aged 20 to 40 receiving a lumbar epidural anesthetic?

How much local anesthetic should be administered per spinal segment to patients aged 20 to 40 receiving a lumbar epidural anesthetic?

• A. 0.25 to 0.5 mL
• B. 0.5 to 1.0 mL
• C. 1 to 2 mL
• D. 2 to 3 mL

Answer: (C)

In epidural anesthesia, how far the block spreads is linked to the volume injected for each spinal segment. In a typical young to middle-aged adult, about 1 to 2 mL of dilute local anesthetic will block one dermatome (one spinal segment). So the per-segment dosing is roughly 1–2 mL, and the total dose is planned by multiplying the number of segments you want to cover by that amount. Using about 1–2 mL per segment helps achieve a predictable, segmental block; giving less may yield an inadequate block, while giving more can raise the level of anesthesia higher than intended and increase the risk of hemodynamic effects.

In epidural anesthesia, how far the block spreads is linked to the volume injected for each spinal segment. In a typical young to middle-aged adult, about 1 to 2 mL of dilute local anesthetic will block one dermatome (one spinal segment). So the per-segment dosing is roughly 1–2 mL, and the total dose is planned by multiplying the number of segments you want to cover by that amount. Using about 1–2 mL per segment helps achieve a predictable, segmental block; giving less may yield an inadequate block, while giving more can raise the level of anesthesia higher than intended and increase the risk of hemodynamic effects.