“…Different combinations of these agents were studied in pediatric anesthesia literature (2,8,10,11). Fentanyl is a frequently used opioid agent proven to be efficient and safe for pediatric procedures, but its potency is intermediate and blood clearance is slow, which usually leads to much longer anesthesia duration than that of endoscopic procedures (2,8,10,11). Remifentanil, which is a more potent agent with shorter duration of action, is frequently used in pediatric outpatient anesthesia in bone marrow aspiration, bronchoscopy, and cardiac catheterization, as well as in laser photocoagulation in premature infants (12)(13)(14)(15).…”