Key result
First catheter ablation for regular supraventricular tachycardia achieved a higher 6-week success rate compared to redo procedures (86.7% vs 71.2%, P=0.003), averaging 83.9% overall.
Why the study?
Does catheter ablation for regular SVT achieve the 90-98% success rates quoted in published literature in a real-world single-center setting?
Observational (n=389)
No
Does catheter ablation for regular SVT achieve the 90-98% success rates quoted in published literature in a real-world single-center setting?
Real-world 6-week success rates for SVT ablation in a large single center are lower than commonly quoted published rates, suggesting patients may be given unrealistic expectations during consent.
Real-world SVT ablation success below quoted rates may warrant adjusted consent counseling; leaves open need for multicenter confirmation.
AIMS: Catheter ablation (CA) has become the treatment of choice for regular supraventricular tachycardia (SVT). The purpose of this study was to investigate whether the current clinical results in a large single centre are as good as success rates quoted to patients from published trials and national cardiology society websites. METHODS AND RESULTS: We recorded and analysed prospectively the acute and follow-up (FU) results of all CA procedures performed for SVT at our institution over a 2-year period. We compared our results with the success rates of 90-98% for CA quoted in the literature. We performed a total of 547 CA at our institution over 2 years, of which 389 (71%) were for regular SVT. Of these, 71 procedures (18%) were redo procedures. The overall acute procedural success rate was 96.1% (374/389). Follow-up data were available for 367 of 389 (94.3%) procedures. The overall 6-week success rate varied between 74.7 and 91.3% depending on the SVT type (average 83.9%). The FU success rates were lower for redo procedures (47/66, 71.2%) when compared with first ablation (de novo) procedures (261/301, 86.7%), P = 0.003. CONCLUSION: Published success rates are much better than current success rates in a large single centre. It is possible that the information regarding outcome given to patients during the consent process is not accurate.
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Showkathali et al. (2007) conducted an observational in Regular supraventricular tachycardia (SVT) (n=389). First catheter ablation (de novo) vs. Redo catheter ablation was evaluated on 6-week follow-up success rate (p=0.003). First catheter ablation for regular supraventricular tachycardia achieved a higher 6-week success rate compared to redo procedures (86.7% vs 71.2%, P=0.003), averaging 83.9% overall.
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