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"Side balloon stenting": a novel technique for bifurcation lesions.

We describe a new technique to treat stenoses of coronary bifurcations. The aim of this technique, called "side balloon stenting," is to treat the bifurcation lesions with the kissing balloon technique, implanting one or more stents without removing the guidewires which remain in place during the whole procedure, avoiding potential problems of access to the vessels jailed by stent struts. In addition, implanting the stent using the kissing balloon technique would prevent the "snow-plow" phenomenon (plaque shifting) in the side branch. The "side balloon stenting" technique was applied in 29 cases at various levels of coronary artery segments involving bifurcations (Table 1). The technical success rate of the side balloon stenting was 90% (25 procedures). The elective placement of one stent in the main vessel was done in 20/25 procedures (80%), and in only 5/25 (20%), it was also necessary to insert a second one in the side branch (due to suboptimal results), using the "culotte" technique in two and the T-technique in the other three. We were unable to advance the system to the right position in 4 patients (13%): in 2 due to twisting of the guidewires and in the other due to vessel tortuosity and insufficient backup of the system (guiding catheter and guidewires). In these four last cases, the delivery system was retrieved and a stent was successfully implanted in the right position in the main branch. Angiographic success (residual stenoses < 30% and TIMI 3 flow in both branches) was obtained in 100% of the cases. The post-intervention period was uneventful. These preliminary results show that the side balloon stenting technique is both feasible and safe in th treatment of coronary bifurcations with a satisfactory rate of procedural success and often (82%) positioning only one stent in the parent vessel, thus avoiding stenting the side branch. It will be necessary, however, to assess, based mainly on restenosis rate, whether these promising immediate results will persist in the long run.

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