Coronary stent deformation by a catheter-induced intramural haematoma

Coronary stent deformation by a catheter-induced intramural haematomaA 71-year-old woman presented with chest pain on exertion.A coronary angiogram revealed a bifurcation lesion in the right coronary artery (figure 1A).A 2.75×20 mm drug-eluting stent was deployed (figure 1B), and intravascular ultrasound showed that the stent was fully dilated (figure 1C).However, a subsequent right coronary angiogram demonstrated severe coronary dissection from the ostium spreading to the stented segment (figure 1D), and a linear image of contrast can be seen outside the lumen underneath the proximal segment of the stent.Intravascular ultrasound demonstrated the presence of an intramural haematoma that had been caused by the dissection and deformed stent struts at the inlet of the stent, which were malapposed (figure 1E).Proximal to the stented segment, an even larger haematoma compressed the vessel lumen in a shape that was similar to the deformed stent (figure 1F) (see online supplementary video 1).We implanted a 3.5×22 mm drugeluting stent in the proximal right coronary artery covering the entry point of the dissection, and inflated the non-compliant balloon in the deformed stent.The deformation was reshaped (figure 1G) and the final angiogram (figure 1H) showed residual dissection, but a good coronary flow.An intramural haematoma is often managed with coronary stents 1 because the progression of an intramural haematoma is not generally considered to be able to override the stent; however, the present case suggests that this hypothesis may not be suitable in some cases, and we should at least be aware of the possibility of stent deformation, which is caused by an intramural haematoma.