gms | German Medical Science

The aim of study was an investigation of changes in autonomic heart rate control before and after successful catheter ablation in patients with atrioventricular nodal reciprocating tachycardia.

Methods: 46 patients atrioventricular nodal reciprocating tachycardia the mean age was 48,9+/-15,4 yrs. All subjects RR intervals were recorded for ten minutes in lying position, during active an orthostatic test, ten minutes in standing position, during clinostatic test and again for ten minutes in lying position. The next day after successful catheter ablation of slow pathway procedure were repeated. Comparised heart rate frequency analysis, their responses to active orthostatic and clinostatic test was performed. General heart rate variability and the heart rate components of power spectrum were evaluated, its three main components measured: very low frequency (VLF), low frequency (LF) and high frequency (HF).

Results: Comparison patients with atrioventricular nodal reciprocating tachycardia before and after successful catheter ablation of slow pathway have show the non significant increase of heart rate frequency and an increase of maximal heart rate reaction to active orthostatic test. An analysis heart rate variability parameters after ablation have showed reduction general heart rate variability, low frequency and high rate frequency in percentage. RR intervals variability index of autonomic balance LF/HF in lying position increased after treatment. Heart rate recovery time after treatment by catheter ablation was better (compare heart rate in lying, in standing and again in lying position).

Conclusion: After successful catheter ablation of slow pathways in patients with atrioventricular nodal reciprocating tachycardia were noted non significant reduction heart rate variability and autonomic control and moderate improvement of functional cardiovascular status in early period.