[Double ventricular excitation in dual atrioventricular node conduction physiology: catheter ablation of the slow conduction pathway of the dual atrioventricular node].
A variety of electrocardiographic manifestations of dual AV nodal physiology have been reported. The specific subtype dual ventricular response is considered as a very rare phenomenon. We present the case of a 53 year old lady who suffered from paroxysmal regular tachycardias for more than seven years. In the last 6 months the symptomatology of the cardiac arrhythmia changed to more persistent und irregular rhythm disturbances. Treatment with class Ia antiarrhythmic drugs and beta-blocking agents failed. The latter even seemed to worsen her very disturbing palpitations. After examination of the ECG recordings, the diagnosis of dual AV nodal physiology with double ventricular response was made--the lady was referred to our institution for electrophysiological testing and radiofrequency catheter ablation of the slow pathway. An invasive electrophysiological study reconfirmed the diagnosis of a dual AV nodal conduction pattern with irregular double ventricular response. The radiofrequency catheter ablation of the the slow pathway achieved a complete cessation of the double ventricular response. This satisfactory outcome was confirmed by analysis of a postinterventional 24 hour holter recording and an exercise stress test. During a follow-up period of three months, the patient remained free of symptoms and there was no recurrence of dual AV nodal conduction physiology in the surface ECG.