title: Distal protection device protects microvascular integrity during primary percutaneous intervention in acute myocardial infarction: a prospective, randomized, multicenter trial.
abstract: BACKGROUND
  Distal protection during primary angioplasty in acute myocardial infarction (AMI) is the subject of recent controversy. The present study was designed to determine whether the distal embolic protection preserves myocardial microvascular integrity and improves clinical outcomes in patients with AMI.
  
  
  METHODS
  A total of 116 AMI patients presenting within 12 h of onset of symptoms were enrolled at 7 angioplasty centers. They were randomly assigned to either primary angioplasty with distal protection group (DP; n=60) or angioplasty alone group (Controls; n=56).
  
  
  RESULTS
  After primary angioplasty, achievement of final Thrombolysis In Myocardial Infarction (TIMI) grade 3 and TIMI Myocardial Perfusion (TMP) grade 3 were more frequent in the DP group than in the control group [58/60 (96%) vs. 43/56 (81%), p=0.016; and 39/60 (65%) vs. 20/56 (38%), p=0.001, respectively]. After primary angioplasty, the baseline and hyperemic averaged peak velocities were significantly higher (23.2+/-11.5 vs. 18.0+/-6.9 cm/s, p=0.029; and 39.2+/-16.7 vs. 30.6+/-10.8 cm/s, p=0.014, respectively) and the baseline and hyperemic microvascular resistance indices were significantly lower (4.18+/-2.22 vs. 5.34+/-2.25 mm Hg cm(-1) s, p=0.036; and 2.38+/-1.39 vs. 3.11+/-1.32 mm Hg cm(-1) s, p=0.030, respectively) in the DP group. Patients in the DP group showed more favorable phasic coronary flow pattern in diastolic deceleration time (679+/-262 vs. 519+/-289 ms, p=0.035; and 751+/-246 vs. 616+/-269 ms, p=0.035, respectively). Major adverse cardiac events at 6 months occurred with similar frequency in both groups (8.7% vs. 11.1%, p=0.400).
  
  
  CONCLUSIONS
  Distal protection device effectively preserves microvascular integrity during primary angioplasty in AMI. Distal protection, however, did not improve clinical outcomes.
authors.affiliation: Department of Cardiology, Ajou University School of Medicine, San 5 Wonchun-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea. sjtahk@ajou.ac.kr
authors.forename: Seung-Jea
authors.initials: SJ
authors.lastname: Tahk
authors.forename: Byoung-Joo
authors.initials: BJ
authors.lastname: Choi
authors.forename: So-Yeon
authors.initials: SY
authors.lastname: Choi
authors.forename: Myeong-Ho
authors.initials: MH
authors.lastname: Yoon
authors.forename: Hyeon-Cheol
authors.initials: HC
authors.lastname: Gwon
authors.forename: Geu-Ru
authors.initials: GR
authors.lastname: Hong
authors.forename: Young-Jo
authors.initials: YJ
authors.lastname: Kim
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Hur
authors.forename: Kwon-Bae
authors.initials: KB
authors.lastname: Kim
authors.forename: Bon-Kwon
authors.initials: BK
authors.lastname: Koo
authors.forename: Seung-Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Junghan
authors.initials: J
authors.lastname: Yoon
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects; D021721:Balloon Occlusion / Q000295:instrumentation*; D004617:Embolism / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D008833:Microcirculation; D008875:Middle Aged; D009203:Myocardial Infarction / Q000628:therapy*; D011446:Prospective Studies