• Yoshiaki Terao, Ushio Higashijima, Tomomi Toyoda, Taiga Ichinomiya, Makoto Fukusaki, and Tetsuya Hara.
• Department of Anesthesia, Nagasaki Rosai Hospital, 2-12-5 Setogoe, Sasebo, 857-0134, Japan. yoterao@na-robyo.jp.
• J Anesth. 2016 Dec 1; 30 (6): 929-934.

PurposeSevoflurane is known to prolong the QT interval. This study aimed to determine the effect of the interaction between intravenous anesthetics and sevoflurane on the QT interval.MethodsThe study included 48 patients who underwent lumbar spine surgery. Patients received 3 μg/kg fentanyl and were then randomly allocated to either Group T, in which they received 5 mg/kg thiamylal, or Group P, in which they received 1.5 mg/kg propofol, at 2 min after administration of fentanyl injection for anesthetic induction. Vecuronium (1.5 mg/kg) and sevoflurane (3 % inhaled concentration) were administered immediately after loss of consciousness and tracheal intubation was performed 3 min after vecuronium injection. Heart rate (HR), mean arterial pressure (MAP), bispectral index score (BIS), and the heart rate-corrected QT (QTc) interval on a 12-lead electrocardiogram were recorded immediately before fentanyl administration (T1), 2 min after fentanyl injection (T2), immediately before intubation (T3), and 2 min after intubation (T4).ResultsThere were no significant differences between the two groups in baseline patient characteristics. BIS and MAP significantly decreased after anesthesia induction in both groups. At T3, MAP in Group T was higher than in Group P, while HR had reduced in both groups. The QTc interval was prolonged after anesthesia induction in Group T, but did not change at any time point in Group P. The QTc interval after anesthesia induction in Group T was longer than in Group P.ConclusionWe concluded that an injection of propofol could counteract QTc interval prolongation associated with sevoflurane anesthesia induction.

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