Anesthesia during a multi-hour procedure
How the scalp is kept numb
Short-acting local anesthetic
Lidocaine, usually combined with epinephrine to reduce bleeding, takes effect within a few minutes and is used for the initial numbing of the donor and recipient areas. It wears off sooner than longer-acting agents, so it may be topped up during a long session.
Success Impact: Fast onset means the scalp is numb soon after the first injections, so surgery can begin promptly.
Long-acting local anesthetic
A longer-acting anesthetic such as bupivacaine is often added. It takes longer to set in, but it can keep the scalp numb for several hours, which reduces the need for top-up injections.
Success Impact: Numbness often continues for some hours after surgery, which helps keep you comfortable on the way home.