RÉSUMÉ
OBJECTIVE: To explore the role of microRNA-92a (miR-92a) in evaluating endothelium damage induced by percutaneous coronary intervention (PCI). METHODS: A case control study was prospectively conducted. Fifty-eight patients with ST-segment elevation acute myocardial infarction (STEAMI) received PCI were enrolled. MiR-92a expression in circulation was determined on the next day after PCI (reverse transcription-polymerase chain reaction). The correlation between miR-92a expression in circulation and PCI influence factors, such as inflation pressure, duration of balloon inflation and length of culprit atheromatous plaque were explored. RESULTS: MiR-92a was lower in inflation pressure 11-19 atm (1 atm=101.325 kPa) group [n=43, mean -0.36, 95% confidence interval (95%CI) -0.60 to -0.12] than inflation pressure ≤10 atm group (n=11, mean 1.16, 95%CI 0.80 to 1.52, P<0.01) and ≥ 20 atm group (n=4, mean 0.26, 95%CI 0.26 to 0.26, P=0.1); and also lower in duration of balloon inflation 6-7 seconds group (n=24, mean -0.42, 95%CI -0.83 to -0.01) than in duration of balloon inflation ≤ 5 seconds group (n=9, mean 0.63, 95%CI 0.49 to 0.78, P=0.03) and ≥ 8 seconds group (n=25, mean 0.45, 95%CI 0.10 to 0.80, P<0.001); lower in implanted stent length ≤30 mm (n=31, mean -0.48, 95%CI -0.80 to -0.16) than those >30 mm (n=27, mean 0.16, 95%CI 0.01 to 0.32, P<0.01). A significantly negative correlation was found between inflation pressure and duration of balloon inflation. (r=-0.48, P<0.001). CONCLUSIONS: There is a relationship between circulating miR-92a, inflation pressure and duration of balloon inflation. Circulating miR-92a could be used to evaluate the endothelium injury induced by PCI, and be used as a new target of prevention and treatment of endothelial dysfunction following revascularization.