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Classical example of polymorphic ventricular tachycardia is torsade de pointes associated with congenital or acquired QT interval prolongation. Monomorphic ventricular tachycardia in the setting of acute myocardial ischemia can also be treated by intravenous lignocaine bolus followed by infusion.
Pediatric exercise testing may be used for evaluation of various disorders of cardiac rhythm rather than for inducible ischemia as in adults. Evaluation of escape rates and ventricular ectopy with exercise in complete heart block is an important aspect in the evaluation of congenital complete heart block.
It is typically seen in digoxing toxicity, catecholaminergic polymorphic ventricular tachycardia and in Andersen syndrome or congenital long QT syndrome 7. Automatic ventricular tachycardia can occur in acute ischemia, electrolyte imbalance and with increased sympathetic tone.
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