Application of a rapid exchange extension catheter technique in type B2/C nonocclusive coronary intervention via a transradial approach

Figure 4 A case with in-stent restenosis was treated with drug-coated balloon. A: The stent was visible in the middle-distal segment of the right coronary artery (RCA); B: Angiography revealed in-stent restenosis; C: A balloon predilated the in-stent restenosis lesion; D: Angiography after predilatation showed severe stenosis and tortuosity in proximal RCA; E: Preimplantation of a stent in the proximal segment of the RCA; F: Angiography after stenting the proximal RCA; G: An in-stent restenosis lesion was treated with drug-coated balloon using a rapid exchange extension catheter; H: Final angiographic result.