Class I - There is evidence and/or general agreement that pacing should be used to prevent tachycardia in the following setting:
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• Sustained pause-dependent ventricular tachycardia (VT), with or without QT prolongation. (Level of Evidence: C)
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Class IIa - The weight of evidence or opinion is in favor of the usefulness of pacing to prevent tachycardia in the following setting:
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• High-risk patients with congenital long QT syndrome. (Level of Evidence: C)
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Class IIb - The weight of evidence or opinion is less well established for the usefulness of pacing to prevent tachycardia in the following setting:
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• Prevention of symptomatic, drug-refractory, recurrent atrial fibrillation in patients with coexisting sinus node dysfunction. (Level of Evidence: B)
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Class III - There is evidence and/or general agreement that pacing to prevent tachycardia is not useful in the following settings:
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• Frequent or complex ventricular ectopic activity without sustained VT in the absence of the long QT syndrome. (Level of Evidence: C)
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• Torsade de pointes VT due to reversible causes. (Level of Evidence: A)
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