• Katsumi Suzuki, Atsushi Numaguchi, Yushi U Adachi, Yukako Obata, Toshiyuki Hatano, Tadashi Ejima, Shigehito Sato, and Naoyuki Matsuda.
• Department of Anesthesia, Koseiren Enshu Hospital, Hamamatsu, 430-0929, Japan.
• J Clin Anesth. 2014 Sep 1;26(6):438-42.

Study ObjectiveTo determine the changes in QT dispersion (QTD) in the standard electrocardiogram (ECG) of postoperative patients and the effect of landiolol on QTD.DesignRandomized, prospective, double-blinded study.Patients40 postsurgical patients.InventionsPatients were allocated to three groups: Control group patients (Group C) were administered saline and patients in the landiolol groups (Group L2 and Group L5) were infused landiolol 2 μg/kg/min and 5 μg/kg/min, respectively. All infusions were started at midnight and discontinued at 6 o'clock in the morning.MeasurementsHeart rate (HR), systolic (SBP) and diastolic (DBP) invasive blood pressure, and ECG were recorded at 0 (immediately before infusion), at 3 o'clock, and 6 o'clock (immediately before termination). The ECG wave was recorded electronically and QTD was analyzed using PC software. Heart rate, blood pressure, QT interval, and QTD were compared as changes from baseline values.Main ResultsIn Groups L2 and L5, HR was significantly decreased, approximately 10 bpm. Both SBP and DBP showed a decreasing trend at 3 o'clock. Absolute QT interval was prolonged in all groups; however, the decrease in QTD occurred in Group L5.ConclusionsContinuous administration of landiolol prevents the increase in QTD found on the morning in postoperative patients. Landiolol demonstrated a possible antiarrhythmic effect by improving the imbalance of repolarization.Copyright © 2014 Elsevier Inc. All rights reserved.

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