Influência da pressäo de liberaçäo dos stents coronários implantados em pacientes com infarto agudo do miocárdio. Análise pela angiografia coronária quantitativa / Influence of balloon pressure inflation in patients undergoing primary coronary stent implantation during acute myocardial infarction. A quantitative coronary angiography analysis

ABSTRACT

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 (FACE="Symbol"> 12 to <16 atm) and group 2 (FACE="Symbol"> 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 (FACE="Symbol"> 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 percent vs. 17.1 percent) and target-vessel revascularization rates (9.8 percent vs 7.3 percent) were similar between the groups.

CONCLUSION:

During AMI stenting, the use of high pressures (FACE="Symbol"> 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