Clinical outcomes of nonagenarians with acute myocardial infarction who undergo percutaneous coronary intervention

Background With increases in life expectancy, percutaneous coronary intervention is being performed more often, even in elderly patients with acute myocardial infarction. However, the optimal management of nonagenarians with acute myocardial infarction is uncertain. This study sought to investigate clinical outcomes of nonagenarians who undergo percutaneous coronary intervention. Methods Of 2640 consecutive patients with acute myocardial infarction hospitalised within 24 hours after symptom onset in 2009–2018, we prospectively analysed 96 nonagenarians (median age 92 years; interquartile range 91–94) who underwent percutaneous coronary intervention. Results The median follow-up period was 375 days. Inhospital major bleeding (Bleeding Academic Research Consortium type 3 or 5) and inhospital death occurred in 15.6% and 17.7% of patients, respectively. The proportion of patients with frailty increased during hospitalisation, from 43.8% (mild frailty 37.5%; moderate to severe frailty 6.3%) at admission to 60.7% (mild frailty 46.8%; moderate to severe frailty 13.9%) at discharge (P < 0.01). The cumulative incidence of all-cause mortality was 22.2% at 180 days and 27.5% at 365 days. After adjusting for confounders, cardiogenic shock (hazard ratio (HR) 2.85; 95% confidence interval (CI) 1.07–7.64) and final thrombolysis in myocardial infarction flow grade less than 3 (HR 2.45; 95% CI 1.03–5.58) were associated with higher mid-term mortality and cardiac rehabilitation (HR 0.25; 95% CI, 0.13–0.50) was associated with lower mid-term mortality. Conclusions The mid-term mortality of selected nonagenarians with acute myocardial infarction who undergo percutaneous coronary intervention is reasonable, but older patients have high rates of inhospital major bleeding and progression of frailty. This study provides physicians, patients and families with important information for therapeutic decision-making.