Table 3. Estimated effect-site concentration of remifentanil at T1-4 in the propofol (P) and ketamine (K) groups.

Immediately before the administration of high-dose remifentanil (T1); immediately before the administration of the anesthetic induction agent (T2); and 2.5 min (T3), and 5 min (T4) after the administration of the anesthetic induction agent.

Data are expressed as mean ± standard deviation.