Differences on in-hospital outcomes in patients with cardiogenic shock due to STEMI vs NSTEMI using a nationwide database

Abstract

Background Our study aims to compare in-hospital management and outcomes in patients with cardiogenic shock due to ST-segment elevation myocardial infarction (STEMI) vs. non-ST-segment elevation myocardial infarction (NSTEMI). Methods We conducted a retrospective cohort study using the National Inpatient Sample database between 2016-2019, including patients with STEMI/NSTEMI complicated by cardiogenic shock. An inverse probability treatment weighting (IPTW) analysis was performed to compare in-hospital management and outcomes between patients with STEMI and NSTEMI. Adjusted relative risks (aRR) with their 95% confidence intervals (CI) were estimated. Results A total of 150,395 patients with cardiogenic shock due to acute myocardial infarction were included, of whom 52.8% had STEMI. The median age was 68 years (60 - 77) and 35% were female. Percutaneous coronary intervention (PCI), intra-aortic balloon counterpulsation, percutaneous ventricular assist device, extracorporeal membrane oxygenation and mechanical ventilation use were significantly higher in the STEMI group compared to NSTEMI. Coronary artery bypass grafting (CABG), renal replacement therapy, length of hospital stay, and total costs were lower in the STEMI group. Pulmonary arterial catheterization and cardiac transplantation were similar between both groups. IPTW analysis showed that in-hospital mortality was significantly higher in the STEMI group compared to NSTEMI (34.2% vs. 28.8%, aRR 1.19, 95% CI 1.14 - 1.23) and also major bleeding. Conclusion In conclusion, patients with cardiogenic shock due to STEMI had worse prognosis, higher use of PCI/mechanical circulatory support and major bleeding than the NSTEMI group. In contrast, patients with NSTEMI had greater use of CABG and hospital resources.