Radiofrequency catheter ablation for paroxysmal supraventricular tachycardia: a report of 135 procedures

Radiofrequency ablation of idiopathic ventricular tachycardia

BACKGROUND

Radiofrequency ablation (RFA) has been shown to be very effective in the treatment of supraventricular tachycardias and has replaced surgical ablation. Only a few reports of RFA for idiopathic ventricular tachycardia (VT) have appeared in the literature during the last two years.

AIM

This paper presents our experience with RFA for idiopathic VT in 19 patients.

MATERIAL

The age range of patients was 22-60, with a mean of 37.9 years. Twelve out of 19 were females, two patients had cardiac failure due to almost incessant VT while the rest had normal left ventricular function. Twelve patients had VT arising from the right ventricle (RV); of these, nine were from the outflow tract, two from the RV apex, and one from the mid-anterior RV. Seven patients had VT arising from the left ventricle (LV); of these, five were from the inferobasal portion of the septum and two were from the anterolateral area.

METHODS

In all patients the diagnostic study and therapeutic RFA were combined in a single procedure. Pacemapping was used to guide the site of RFA in patients with VT arising from the RV. Local activation time (LAT), Purkinje potentials (PP) and pacemapping were used to guide RFA in those patients with LV septal tachycardias.

RESULTS

A total of 21 RF procedures were performed in 19 patients and 15 out of 19 patients had successful VT ablation. Ten of the 12 patients with RV tachycardias and all five patients with LV septal (left axis, right bundle branch block) tachycardias were successfully ablated. One patient with mid anterior RV VT required two attempts for successful ablation. One patient with RV outflow tract (RVOT) VT could not be ablated despite two attempts. Two patients with LV tachycardias arising from the antero-lateral LV could also not be ablated. During a follow up period of two to 16 months none of the successful patients had recurrence of VT. The number of RF applications was one to 27, mean 10; fluoroscopy times were four to 75, mean 26.9 minutes.

CONCLUSION

Idiopathic VT frequently arises from the RVOT and inferobasal portion of the LV septum. These tachycardias can be diagnosed on clinical and ECG grounds. RFA for idiopathic VT arising from these areas has a high success rate and this mode of treatment should be considered as a nonpharmacological curative treatment for symptomatic patients.

Cost effectiveness of day stay versus inpatient radiofrequency (RF) ablation for the treatment of supraventricular tachyarrhythmias

BACKGROUND

It is well established that radiofrequency (RF) ablation is the most cost effective treatment strategy for patients with supraventricular tachycardia. Previous cost estimates assumed at least an overnight stay following RF ablation. Day stay RF ablation however appears to be a safe alternative.

AIMS

The aim of this study was to compare day stay and inpatient catheter ablation in terms of cost, efficacy and safety.

METHODS

This was a retrospective cost effectiveness analysis. The study population consisted of 25 consecutive patients who underwent day stay RF ablation and 25 consecutive patients who underwent inpatient RF ablation (historical controls). Economic analysis was based upon a detailed clinical costing.

RESULTS

The mean overall cost per patient of inpatient RF ablation in 1994 Australian dollar values is $2354 (SD, $642) compared with $1876 (SD, $595) for day stay RF ablation (p < 0.01). Day stay RF ablation is a cost effective alternative to inpatient RF ablation.

Radiofrequency ablation: a review of its application and nursing considerations

Radiofrequency ablation (RFA), a therapeutic electrophysiological procedure, has become the treatment of choice for a number of cardiac arrhythmias. These arrhythmias include those of anomalous pathways, as seen in AV nodal re-entry tachycardia and Wolff-Parkinson-White syndrome, and re-entry tachycardias of atrial and ventricular origins. This paper discusses the mechanism of RFA and the physiology of re-entry circuits, and outlines the cardiac arrhythmias treated by RFA. The nursing responsibilities associated with the RFA procedure--including patient education, observation for potential complications, and other peri- and post-procedure considerations--are then addressed.

Day stay transcatheter radiofrequency ablation for supraventricular tachyarrhythmias

OBJECTIVE

To describe our initial experience with transcatheter radiofrequency ablation as a day stay procedure for patients with supraventricular tachyarrhythmias resulting from aberrant atrioventricular pathways.

DESIGN

Prospective study of the first 50 patients at the Royal Perth Hospital whom we intended to treat and discharge on the same day. Patients underwent a combined electrophysiological study and radiofrequency ablation.

RESULTS

Accessory pathways were identified in 32 patients (successfully ablated in 30) and dual atrioventricular nodal pathways in 18 patients (with successful ablation of the slow pathway in 17). Thirty-eight patients were discharged on the same day (24 treated for accessory pathways, and 14 treated for dual atrioventricular nodal pathways). There were no late complications or readmissions in patients discharged on the same day.

CONCLUSIONS

In patients with supraventricular tachyarrhythmia, day stay transcatheter ablation can be planned without a definitive prior diagnosis of the physiological cause. Complications or other reasons for overnight admission are apparent at completion of the procedure.