Impacts of aspirin use on the prognosis of patients with myocardial infarction and pneumonia.

Background: We aimed to explore the impact of aspirin use on the risk of readmission and mortality in patients with myocardial infarction and pneumonia.

Methods: This was a cohort study including 703 participants with severe pneumonia and myocardial infarction included in the Medical Information Mart for Intensive Care (MIMIC)-III and the MIMIC-IV. Kaplan-Meier survival analysis was used to show the readmission and survival probability of patients with or without aspirin. In addition, univariate and multivariable models were used to investigate the impact of aspirin on the risk of readmission or mortality of patients. Subgroup analyses were conducted in terms of age, gender, antibiotic use, vancomycin and ampicillin use.

Results: Average follow-up was one year, 22% of patients experienced readmission, and 72% patients survived. After the confounders were adjusted for, a 0.46-fold decreased risk of readmission (hazard ratio [HR]=0.46, 95% confidence interval [CI]: 0.27-0.78) and a 0.58-fold decreased risk of one-year mortality (HR=0.56, 95%CI: 0.42-0.82) were observed favoring aspirin use. Subgroup analyses revealed that aspirin was, however, associated with an increased risk of mortality in patients not receiving vancomycin treatment (HR=1.79, 95%CI: 1.08-2.97).

Conclusions: Our findings suggest that clinicians should consider using aspirin in patients with severe myocardial infarction and pneumonia was recommended.