6-MONTH FOLLOW-UP OF SUCCESSFUL STENTING FOR ACUTE DISSECTION AFTER CORONARY ANGIOPLASTY - COMPARISON BETWEEN SLOTTED TUBE (PALMAZ-SCHATZ) AND FLEXIBLE COIL (GIANTURCO-ROUBIN) STENT DESIGNS

The aim of this study was to evaluate the influence that two different stent designs may have in later outcome following successful coronary stent implantation for acute dissection after balloon angioplasty. in the present study, 50 consecutive patients were matched to compare la te outcome between the use of slotted tube (Palma-Schatz) and flexible coil (Gianturco-Roubin) stent designs (25 in each group). Group match ing was, performed according to vessel size, location of target lesion , and dissection type among patients undergoing successful coronary st enting to treat an acute dissection following balloon coronary angiopl asty. Poststent minimal luminal diameter(2.46 +/- 0.49 mm vs 2.35 +/- 0.47 mm, not significant [NS]) and acute luminal gain (2.02 +/- 0.61 m m vs 1.85 +/- 0.56 mm, NS) were similar in slotted tube and flexible c oil stent groups, respectively. However at 6-month follow-up, late los s in luminal diameter was larger in lesions treated with a flexible co il stent (0.96 +/- 0.75 mm vs 0.62 +/- 0.55 mm, P = 0.05), and minimal luminal diameter was smaller in those lesions treated with a flexible coil stent (1.38 +/- 0.87 mm vs 1.84 +/- 0.63 mm, P < 0.05). Angiogra phic restenosis (> 50% diameter narrowing) occured in four lesions tre ated with a slotted tube stent (16%) compared to ten lesions treated w ith flexible coil stent (40%, P < 0.05). The design of the coronary st ent may have significant influence in the late lesion outcome. In pati ents with acute dissection following balloon corollary angioplasty use of a slotted tube stent design (Palmaz-Schatz) may result in lower la te loss and larger luminal diameter at 6-month follow-up than use of a flexible coil stent design (Gianturco-Roubin).