Pediatric Cardiology Fellowship Practice Test

Vecuronium is an intermediate-acting nondepolarizing muscle relaxant. Its time to reach maximum effect after a single IV dose is a few minutes, typically about 3 to 4 minutes, and the overall duration of action is tens of minutes, commonly around 20 to 40 minutes (often cited as 25–40 minutes, with variability based on dose and patient factors). This profile fits the statement of an onset to peak of roughly 3–4 minutes and a duration of about 20–45 minutes.

The other patterns don’t match vecuronium well: a onset to peak of 0–1 minute would be unusually fast for a nondepolarizing agent and would resemble rapid-onset agents like some rocuronium at high doses or depolarizing agents; a 5–7 minute onset is slower than typical for vecuronium; a duration of 60–90 minutes is more characteristic of long-acting blockers like pancuronium; and 10–20 minutes would be shorter than expected for vecuronium’s usual duration.