Abstract
Pioglitazone (PIO) is a new class of anti-diabetic agent with an anti-inflammatory effect. In the experimental studies, pretreatment with PIO before ischemia/reperfusion reduced ischemia-reperfusion injury and myocardial infarct size. However, the clinical efficacy of this therapy in patients with acute myocardial infarction (AMI) remains unknown. Three hundred and nineteen diabetic patients with ST-segment elevation AMI, treated with bare metal stent within 24h from the onset of AMI were examined. Myocardial blush grade, ST-segment resolution, peak creatine kinase (CK) level, and left ventricular ejection fraction (LVEF) were compared between PIO group (pretreatment with PIO [+]; n=26) and non-PIO group (pretreatment with PIO [-]; n=293). The PIO group showed a significantly higher incidence of blush score ≥ 2 and complete ST-segment resolution (blush score ≥ 2; 38% vs. 71%, P=0.04, ST-segment resolution; 44% vs. 71%, P=0.04). Besides, slow flow/no-reflow phenomenon and reperfusion arrhythmia did not occur in this group. Better improvement of LVEF and lower peak CK level was observed in this group, although these were not statistically significant (LVEF 48% vs. 41%, P=0.10, peak CK level 2,041 vs. 3,207, P=0.06). Pretreatment with PIO in diabetic patients with AMI resulted in better myocardial perfusion with less reperfusion injury.
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