This chapter contains sections titled:

• Introduction

• Mechanisms of tachycardia

• Reentrant excitation

• Dispersion of repolarization and conduction

• Acquired ventricular arrhythmias

• Ventricular tachycardia in chronic cardiac disease

• Myocardial infarction

• Dilated and hypertrophic cardiomyopathy

• Arrhythmogenic right ventricular cardiomyopathy

• Summary

• References