Torsades de pointes ventricular tachycardia induced by intravenous amiodarone

The authors report on the case history of a 61 year old woman with hyperthyroidism induced atrial fibrillation, tachycardiomyopathy and congestive heart failure, in whom life threatening ventricular proarrhythmia (torsades de pointes) developed in response to intravenous amiodarone. The patient in a septic state was resuscitated because of ventricular fibrillation. The atrial fibrillation complicated by a high ventricular frequency was slowed down with intravenous amiodarone; additionally, the iodine-containing antiarrhythmic drug was expected to counter thyrotoxicosis. In response to amiodarone (2 x 300 mg), the sinus rhythm was restored, but the excessive post-cardioversion bradycardia led to the development of extreme QT interval prolongation and torsades de pointes ventricular tachycardias that often degenerated into ventricular fibrillation. In connection with this case, the authors survey those electropharmacological and pathophysiological factors which may have played a role in the emergence of ventricular proarrhythmia based on a lengthening of repolarization through the exhaustion of the repolarization reserve.     

恶性快速性室性心律失常致心源性晕厥的临床观察

目的探讨恶性快速性室性心律失常致心源性晕厥的病因与高危心电图表现。方法分析48例在入院时或入院后至少发生1次心源性晕厥患者的病因及其发作时与发作前后的常规12导联心电图或持续心电监护心电图形。结果48例恶性快速性心律失常致心源性晕厥最常见的基本病因为急性冠心病或陈旧性心肌梗死,其次为扩张型和肥厚型心肌病及其他病因;低钾血症是最常见的诱因;最常见的恶性快速性室性心律失常类型是尖端扭转型室性心动过速。其高危心电图表现:继发性长QT间期综合征;Brugada综合征;异常J波;复杂性室性早搏;急性心肌梗死伴ST-T电交替,或广泛前壁心肌梗死伴墓碑样ST段抬高;扩张型心肌病伴进展性QRS波群低电压。上述各种病因心源性晕厥者有各自不同的临床及心电学特征。结论恶性快速性室性心律失常所致心源性晕厥存在多种病因及高危心电图表现。     

恶性快速性室性心律失常致心源性晕厥的临床观察

目的探讨恶性快速性室性心律失常致心源性晕厥的病因与高危心电图表现。方法分析48例在入院时或入院后至少发生1次心源性晕厥患者的病因及其发作时与发作前后的常规12导联心电图或持续心电监护心电图形。结果48例恶性快速性心律失常致心源性晕厥最常见的基本病因为急性冠心病或陈旧性心肌梗死，其次为扩张型和肥厚型心肌病及其他病因；低钾血症是最常见的诱因；最常见的恶性快速性室性心律失常类型是尖端扭转型室性心动过速。其高危心电图表现：继发性长QT间期综合征；Brugada综合征；异常J波；复杂性室性早搏；急性心肌梗死伴ST—T电交替，或广泛前壁心肌梗死伴墓碑样ST段抬高；扩张型心肌病伴进展性QRS波群低电压。上述各种病因心源性晕厥者有各自不同的临床及心电学特征。结论恶性快速性室性心律失常所致心源性晕厥存在多种病因及高危心电图表现。