Influence of balloon pressure inflation in patients undergoing primary coronary stent implantation during acute myocardial infarction: a quantitative coronary angiography analysis

• Main Authors: Luiz Alberto Mattos, Amanda G.M.R. Sousa, Áurea Chaves, Fausto Feres, Ibraim Pinto, Luiz Tanajura, Marinella Centemero, Alexandre Abizaid, Ana C. Seixas, Andréa Abizaid, Galo Maldonado, Rodolfo Staico, J. Eduardo M.R. Sousa
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Cardiologia (SBC) 2003-03-01
• Series: Arquivos Brasileiros de Cardiologia
• Subjects: acute myocardial infarction; stents; restenosis
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0066-782X2003000300002

OBJECTIVE:To verify the influence of moderate- or high-pressure balloon inflation during primary coronary stent implantation for acute myocardial infarction. METHODS: After successful coronary stent implantation, 82 patients were divided into 2 groups according to the last balloon inflation pressure: group 1 (<FONT FACE=Symbol>&sup3;</FONT>12 to <16 atm) and group 2 (<FONT FACE=Symbol>&sup3;</FONT>16 to 20 atm), each with 41 cases. All patients underwent late coronary angiography. RESULTS: In group 1, the mean stent deployment pressure was 13.58±0.92 atm, and in the group 2 it was 18.15±1.66 atm. Stents implanted with moderate pressures (<FONT FACE=Symbol>&sup3;</FONT>12 to <16 atm) had a significantly smaller postprocedural minimal lumen diameter, compared to with those with higher pressure, with lesser acute gain (2.7± 0.4 mm vs 2.9±04 mm; p=0.004), but the late lumen loss (0,9±0,8 mm vs 0,9±0,6 mm) and the restenosis (22% vs. 17.1%) and target-vessel revascularization rates (9.8% vs 7.3%) were similar between the groups. CONCLUSION: During AMI stenting, the use of high pressures (<FONT FACE=Symbol>&sup3;</FONT>16 atm) did not cause a measurable improvement in late outcome, either in the late loss, its index, and the net gain, or in clinical and angiographic restenosis rates.