Correspondence to:

espite remarkable advances in coronary interventional cardiology, in-stent restenosis of bare metal stents (BMS) and late throm-bosis of drug-eluting stents (DES) are perceived as the most important limitations of coronary stent-ing today. Predictors have been identified for both, and poor stent expansion is one of the common denominators. It is therefore a daily concern in current clinical practice.1 Two interesting papers published in the current issue of Heart highlight this concern. Russo et al, using a non atherosclerotic porcine model, evaluate the intimal response after BMS implantation with different balloon to artery ratios (BA ratio) (see article on page 1609).2 After assessing vessel size b