Zero-fluoroscope ablation is namedgreen ablation. With the improvement of medical equipments and manipulation skills,it has become an important therapy for tachyarrhythmias.Green ablation has the advantages of being radiationless,high success rate and fewer complications,which enable electrophysiological surgery to be completed effectively and safely. En Site Velocity three-dimensional electro-anatomical mapping system is remarkably compatible—any catheter can be showed through contacting the body and gener...