Abstract | BACKGROUND: OBJECTIVE: METHODS: Electrocardiography (ECG) and corresponding trend data were extracted from automated electronic data capture of physiological monitoring. Ten-second epochs of ECG data were extracted in 1-min intervals for 12 min, starting 1 min before dexmedetomidine bolus administration, and ending 10 min after. QT intervals were extracted using an automated routine in MATLAB, and corrected for heart rate (HR) using Bazett's (QTcB) and Fridericia's formulas (QTcF). QTcB and QTcF were compared using Wilcoxon signed-rank test between baseline measurements and the subsequent four interval values. RESULTS: Data from 21 subjects (17 male) with median (range) age 7.1 (5.4-9.5) yr, weight 23.6 (16.2-36.7) kg, and height 121 (103-140) cm were analyzed. Bolus administration of dexmedetomidine reduced HR in all subjects (median 22%), and caused transient reduction of QT interval, with its peak at 1-min postbolus administration: QTcB (median reduction 30.7 ms, P < 0.001) or QTcF (median reduction 15.4 ms, P = 0.001); QT shortening became statistically insignificant 4 min following dexmedetomidine bolus administration for QTcB and 2 min for QTcF. CONCLUSION: In this study, a rapid bolus of dexmedetomidine transiently shortened corrected QT intervals. However, these effects are confounded by dexmedetomidine-induced bradycardia. These findings should be confirmed in pediatric studies without concomitant TIVA administration and with optimized correction of baseline HR.
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Authors | Matthias Görges, Simon D Whyte, Shubhayan Sanatani, Joy Dawes, Carolyne J Montgomery, J Mark Ansermino |
Journal | Paediatric anaesthesia
(Paediatr Anaesth)
Vol. 25
Issue 12
Pg. 1287-93
(Dec 2015)
ISSN: 1460-9592 [Electronic] France |
PMID | 26507917
(Publication Type: Journal Article)
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Copyright | © 2015 John Wiley & Sons Ltd. |
Chemical References |
- Anesthetics, Intravenous
- Piperidines
- Dexmedetomidine
- Remifentanil
- Propofol
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Topics |
- Administration, Intravenous
- Anesthesia, Intravenous
- Anesthetics, Intravenous
- Child
- Child, Preschool
- Dexmedetomidine
(administration & dosage, adverse effects)
- Electrocardiography
(drug effects)
- Female
- Heart Rate
(drug effects)
- Humans
- Long QT Syndrome
(chemically induced, epidemiology)
- Male
- Monitoring, Intraoperative
- Piperidines
- Propofol
- Remifentanil
- Retrospective Studies
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