All 2,617 children who received midazolam and meperidine for a variety
of endoscopic procedures were monitored for the development of advers
e behavioral problems. Thirty-six (1.4%) of the children (ages 1-17 ye
ars) experienced a paradoxical behavioral reaction, which consisted of
inconsolable crying, combativeness, disorientation, dysphoria, tachyc
ardia, agitation, and restlessness, The reaction occurred at a mean of
17 minutes after the administration of midazolam. Following treatment
with flumazenil, the reaction dissipated within a mean of 14 minutes.
Three of the 36 patients underwent additional endoscopic procedures u
tilizing-only meperidine. No similar reaction was observed in these pa
tients. Awareness of the reaction and prompt administration of flumaze
nil decreased the duration of the reaction.