Platelet activity is a biomarker of cardiac necrosis and predictive of untoward clinical outcomes in patients with acute myocardial infarction undergoing primary coronary stenting.
BACKGROUND
The relationship between platelet activity and myocardial injury in patients with ST-segment elevated (ST-se) acute myocardial infarction (AMI) remains unclear. This study tested the hypothesis that platelet activity (expressed by CD62p) is enhanced and predictive of both the extent of myocardial damage and 30-day clinical outcome in patients with ST-se AMI undergoing primary coronary stenting.


RESULTS
Platelet CD62p expression prior to coronary angiographic was prospectively measured using flow cytometry in 45 consecutive patients with AMI undergoing primary coronary stenting. The CD62p expression was also evaluated in 20 healthy and 20 at-risk control subjects. The CD62p expression was significantly higher in AMI patients than in healthy and at-risk control subjects (all p values <0.0001). Patients with high CD62p expression (>or=8%) had significantly higher creatine kinase-MB (p<0.0001) levels, higher incidence of cardiogenic shock (p=0.009) upon presentation, significantly lower left ventricular ejection fraction (p=0.0003), and significantly higher incidence of 30-day composite major adverse clinical outcomes (MACO) (advanced congestive heart failure >or=class 3 or 30-day mortality) (p<0.0001) than those patients with low CD62p expression (<8%). Multiple stepwise logistic regression analysis demonstrated that only high CD62p expression (>or=8%) was an independent predictor of 30-day MACO (all p<0.0001).


CONCLUSIONS
Platelet activation was significantly increased in patients with ST-se AMI. Initial CD62p expression was independently associated with extent of myocardial damage and 30-day MACO.
Yip
Hon-Kan
HK
Division of Cardiology, Chang Gung Memorial Hospital, Kaohsiung, Taiwan, ROC.
Chang
Li-Teh
LT
Sun
Cheuk-Kwan
CK
Chen
Mien-Cheng
MC
Yang
Cheng-Hsu
CH
Hung
Wei-Chin
WC
Hsieh
Yuan-Kai
YK
Fang
Chih-Yuan
CY
Hang
Chi-Ling
CL
Wu
Chiung-Jen
CJ
Chang
Hsueh-Wen
HW
D000368:Aged; D015415:Biomarkers / Q000097:blood; D001792:Blood Platelets / Q000502:physiology*; D001800:Blood Specimen Collection; D017023:Coronary Angiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000628:therapy*; D009206:Myocardium / Q000473:pathology*; D009336:Necrosis; D019007:P-Selectin / Q000097:blood; D011237:Predictive Value of Tests; D012016:Reference Values; D012307:Risk Factors; D015607:Stents; D016896:Treatment Outcome
D015415:Biomarkers; D019007:P-Selectin