Limitations
The non-randomized, single-center nature of the present study may limit the generalizability of our findings. The consecutive nature of the patients analyzed helps limit bias in the absence of randomization. All cases were performed by one of 5 high-volume operators, and by the end of the study period, all operators were routinely utilizing ICFS catheters for all AVNRT ablation procedures. At our medical center, increased utilization of a steerable sheath has paralleled increased adoption of ICFS, thus some of the differences observed with ICFS may be attributable the use of the steerable sheath. As AVNRT ablation procedures tend to carry low complication rates, the study may not have been sufficiently powered to evaluate risk of AV block.