Anatomy of the conduction system -- Cardiac electrophysiology -- Cardiac vectors and the genesis of the electrocardiogram -- Electrocardiography -- Sinus rhythms -- Pathogenesis and classification of arrhythmias -- Bradyarrhythmias and conduction disturbances -- Atrial rhythms -- Atrial fibrillation -- Junctional rhythms -- Ventricular rhythms -- Clinical approach to arrhythmias and intermittent collapse -- Diagnostic approach to narrow QRS complex tachycardia -- Diagnostic approach to wide QRS complex tachycardia -- Ambulatory electrocardiographic recordings -- Heart rate variability -- Antiarrhythmic drugs -- Pacemaker therapy -- Electrophysiology studies -- Canine cardiomyopathies -- Arrhythmias in feline cardiomyopathies -- Inherited ventricular arrhythmias in German shepherd dogs -- Systemic disease and arrhythmias including selected non-cardiogenic causes of collapse -- Cardiac arrhythmias and anaesthesia.