Utility of Multi-spline Multi-electrode 3D Mapping Catheters in
Idiopathic Outflow Tract Ventricular Tachycardia.
AbstractWe describe two cases of idiopathic VT arising from the postero-septal
RVOT in both cases. Each case demonstrates an important learning point
and advantage of multi-spline multi-electrode mapping catheters in
idiopathic outflow VT. In the first case two dominant PVC morphologies
can be clearly seen which we believe originate from a single site of
origin with multiple exit sites caused by focal fibrosis. In the second
case, focal fibrosis in this region leads to anisotropic conduction of
the RVOT in areas of low voltage. We surmise that multi-spline
multi-electrode catheters are essential in such cases as extensive
point-by-point mapping could significantly prolong procedure time and
fail to identify the earliest activation site in the case of anisotropic
tissue conduction due to variations in activation latency.