Relationship between diastolic blood pressure and adverse outcomes in ST-elevation myocardial infarction undergoing percutaneous coronary intervention

Background Low diastolic blood pressure(DBP)was reported to be associated with reduced coronary blood flow,subclinical myocardial damage,and cardiovascular events. The aim of this study was to explore the impact of low DBP on clinical outcomes in patients with ST-elevation myocardial infarction(STEMI)undergoing percutaneous coronary intervention(PCI). Methods A total of 1232 patients with STEMI were retrospectively enrolled and divided into two groups according to admission DBP level:≥70 mm Hg(n=817)and < 70 mm Hg(n=415). The relationship between DBP and in-hospital and 1-year adverse events was evaluated.Results In-hospital death occurred in 2.4% of patients. The in-hospital mortality(5.3% vs. 1.0%,P<0.001)and major adverse clinical events(11.1% vs. 7.5%,P=0.033)were significantly higher in patients with a low DBP.DBP <70 mm Hg was associated with in-hospital death(adjusted odds rate=3.31,95%CI:1.36-8.07,P=0.009).Additional significant indicators included eGFR < 60 mL/min/1.73 m^2 and intra aorta balloon pump(IABP)treatment. Seventy-seven(6.3%)patients died in the one-year follow-up. DBP < 70 mm Hg was associated with increased risk of 1-year death(8.9% vs. 4.8%,Log-rank=9.9,P=0.002). Conclusion Low DBP was associated with increased risk of in-hospital and 1-year adverse prognosis in patients with STEMI undergoing PCI,which could be a tool for risk assessment.