Undilatable Coronary in Stent Restenosis – Still Difficult to Handle in this Era

Despite advancing the new stent, balloon, and other therapeutic technologies in interventional cardiology, there is no consensus on the best treatment for undilatable coronary in-stent restenosis. We present a classical rotational atherectomy strategy to manage undilatable in-stent restenosis with single or multiple stent layers with future perspectives.