TY  - JOUR
AB  - Previous studies suggest an impact of dexmedetomidine on cardiac electrophysiology. However, experimental data is sparse. Therefore, purpose of this study was to investigate the influence of dexmedetomidine on different experimental models of proarrhythmia. 50 rabbit hearts were explanted and retrogradely perfused. The first group (n = 12) was treated with dexmedetomidine in ascending concentrations (3, 5 and 10 µM). Dexmedetomidine did not substantially alter action potential duration (APD) but reduced spatial dispersion of repolarization (SDR) and rendered the action potentials rectangular, resulting in no proarrhythmia. In further 12 hearts, erythromycin (300 µM) was administered to simulate long-QT-syndrome-2 (LQT2). Additional treatment with dexmedetomidine reduced SDR, thereby suppressing torsade de pointes. In the third group (n = 14), 0.5 µM veratridine was added to reduce the repolarization reserve. Further administration of dexmedetomidine did not influence APD, SDR or the occurrence of arrhythmias. In the last group (n = 12), a combination of acetylcholine (1 µM) and isoproterenol (1 µM) was used to facilitate atrial fibrillation. Additional treatment with dexmedetomidine prolonged the atrial APD but did not reduce AF episodes. In this study, dexmedetomidine did not significantly alter cardiac repolarization duration and was not proarrhythmic in different models of ventricular and atrial arrhythmias. Of note, dexmedetomidine might be antiarrhythmic in acquired LQT2 by reducing SDR.
AU  - Ellermann, Christian
AU  - Brandt, Jonas
AU  - Wolfes, Julian
AU  - Willy, Kevin Kurt
AU  - Wegner, Felix K.
AU  - Leitz, Patrick R.
AU  - Lange, Philipp Sebastian
AU  - Reinke, Florian Johann
AU  - Eckardt, Lars
AU  - Frommeyer, Gerrit
DA  - 2021-12-14
DO  - 10.17879/52039515767
KW  - Cardiology
KW  - Preclinical research
LA  - eng
N1  - Scientific Reports 11 (2021) 23940, 1-11
N1  - Finanziert über die DEAL-Vereinbarung mit Wiley 2019-2022.
PY  - 2021-12-14
TI  - Safe electrophysiologic profile of dexmedetomidine in different experimental arrhythmia models
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:6-52029443426
Y2  - 2024-12-26T20:51:20
ER  -