Acute Myocardial Infarction During Hospitalization for Community-Acquired Pneumonia in Geriatric Patients: A Cross-Sectional Study

Abstract Background: Community-acquired pneumonia (CAP) and acute myocardial infarction cardiovascular (AMI) are two important health issues in elderly. Little is known regarding characteristics of AMI in elderly hospitalized for CAP. Therefore, we investigated the prevalence, characteristics compared with younger patients, impact on clinical outcomes and risk factors of AMI during hospitalization for CAP in geriatric patients.Methods: 11009 adult inpatients consisted of 5111 elderly patients≥ 65 years and 5898 patients＜65 years in respiratory ward and 1095 inpatients ≥65 years in geriatrics ward diagnosed with CAP were retrospectively analyzed by electronic medical records. Results: 159 (3.1%) elderly patients in respiratory ward and 77 (7.0%) patients in geriatrics ward experienced AMI during hospitalization for CAP. AMI were more frequently seen in elderly patients (3.1% vs. 1.0 %), Patients≥65 years who experienced AMI during hospitalization for CAP had higher percentage of respiratory failure (P = 0.001), hypertension (P = 0.008), dyspnea (P=0.046), blood urea nitrogen (BUN)≥7mmol/L (P < 0.001), serum sodium <130 mmol/L(P = 0.005) and had higher in-hospital mortality compared to patients＜65 years (10.1% vs. 6.6%). AMI was associated with increased in-hospital mortality (odds ratio, OR, with 95% confidence interval: 1.49 [1.24-1.82]; P<0.01). Respiratory failure (OR, 1.34 [1.15–1.54]; P<0.01), preexisting coronary artery disease (OR, 1.31[1.07–1.59]; P = 0.02), diabetes (OR, 1.26 [1.11–1.42]; P = 0.02), BUN (OR, 1.23 [1.01–1.49]; P = 0.04), and impaired consciousness (OR, 1.19 [1.07–1.32]; P = 0.03) were correlated with the occurrence of AMI in the elderly.Conclusions: The incidence of AMI during CAP hospitalization in geriatric patients is notable and have an impact on in-hospital mortality. Characteristics of the elderly differ from the general population. Particular attention should be paid to elderly patients with risk factors for AMI. Our study may represent useful information for clinical strategies aimed at preventing AMI and decreasing mortality in geriatric patients hospitalization for CAP.