P5475Essential thrombocytosis is associated with worse hospital outcomes in patients presented with acute myocardial infarction: a propensity score analysis of the National Inpatient Sample

Abstract

Abstract Background/Introduction Essential thrombocytosis (ET) is a rare disease characterized by vasomotor symptom, thrombotic event, and hemorrhage. Due to its rare occurrence, limited data are available to examine the impact of ET on acute myocardial infarction (AMI). Purpose To evaluate the impact of ET on hospital outcomes of AMI. Methods We use the 2016 National Inpatient sample database to identify all the admissions with a principal diagnosis of AMI with or without ET. A matched control group was then generated using propensity score from age, sex, race, location, insurance, income, hospital type, hospital location, Charlsoncat Comorbidity Score. Prevalence, baseline characteristic of AMI patient with or without ET was described and compared. Univariable logistic regression was used to measure mortality and the rate of catheterization. Results ET was found in 0.28% (1,814) in total AMI admissions (641,854). Age (69.52 vs 69.70), female percentage (48.04% vs 48.03%) and baseline comorbidities including STEMI (27.49% vs 25.08%), diabetes (33.03% vs 30.51%), heart failure (40.18 vs 45.89%) and chronic kidney disease (22.05% vs 26.28%) was found to be comparable between two groups (p>0.05, table 1). Compared to non ET group, ET is associated with significantly higher hospital mortality (5.74% vs 2.43%, OR 2.44 [1.09–5.48], p=0.03), prolonged length of stay (7.61 vs 4.30 days, p<0.01). Interestingly, ET is also associated with lower utilization of cardiac catheterization (37.46% vs 46.52%, p=0.01). Essential Thrombocytosis and AMI Parameter AMI with ET Matched control: AMI without ET Odds ratio (95% CI) P value (n=1,814) (n=1,814) Age, years 69.52±0.72 69.70±0.70 p>0.05 Female, % 48.04 48.03 p>0.05 STEMI, % 27.49 25.08 p>0.05 Hypertension, % 81.57 83.08 p>0.05 Diabetes, % 33.03 30.51 p>0.05 Heart failure, % 40.18 45.89 p>0.05 Chronic kidney disease, % 22.05 26.28 p>0.05 Mortality, % 5.74 2.43 2.44 (1.09–5.48) p=0.03 Catheterization, % 37.46 46.52 0.68 (0.51–0.91) P=0.01 Length of stay, days 7.61±0.48 4.30±0.21 P<0.01 Values are reported as mean ± S.E. Categorical variables are represented as frequency. Conclusion ET is infrequently observed in patients with AMI. Having ET is associated with higher hospital mortality, longer hospital stay and lower utilization of cardiac catheterization. Acknowledgement/Funding None