Influence of balloon pressure inflation in patients undergoing primary coronary stent implantation during acute myocardial infarction. A quantitative coronary angiography analysis.
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 (> or = 12 to < 16 atm) and group 2 (> or = 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 (> or = 12 to < 16 atm) had a significantly smaller post-procedural minimal lumen diameter, compared to with those with higher pressure, with lesser acute gain (2.7 +/- 0.4 mm vs 2.9 +/- 0.4 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.


CONCLUSIONS
During AMI stenting, the use of high pressures (> or = 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.
Mattos
Luiz Alberto
LA
Instituto Dante Pazzanese de Cardiologia, Brasil. pivmattos@uol.com.br
Sousa
Amanda G
AG
Chaves
Aurea
A
Feres
Fausto
F
Pinto
Ibraim
I
Tanajura
Luiz
L
Centemero
Marinella
M
Abizaid
Alexandre
A
Seixas
Ana C
AC
Abizaid
Andréa
A
Maldonado
Galo
G
Staico
Rodolfo
R
Sousa
J Eduardo M
JE
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015906:Angioplasty, Balloon, Coronary; D002985:Clinical Protocols; D017023:Coronary Angiography; D023903:Coronary Restenosis / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000628:therapy*; D011312:Pressure; D011446:Prospective Studies; D015607:Stents; D016896:Treatment Outcome