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Objective: Recent studies have shown that CPPD might be associated with a higher risk of cardiovascular events related to inflammation. Thus, we aim to examine the outcomes of patients admitted for acute coronary syndrome (ACS) with and without CPPD., Methods: We used data from the US National Inpatient Sample (NIS) Database to identify patients who were admitted for ACS between 2006 and 2019. The ICD-9 and -10 codes were used to determine the patients with ACS related hospitalizations and of those, we classified two groups of patients: those with and those without any CPPD code. Data collection included demographics and comorbidities. Outcomes were in-hospital mortality, length of stay, hospital charges, and in-hospital complications. Associations between CPPD and specific morbidity were evaluated with chi-square tests. T-tests were used for continuous variables. We have also presented odds ratio (OR) along with 95 % confidence intervals (CI) for the outcomes of interest., Results: A total of 17,322,362 patients were admitted for ACS. Among them, 7,458 had CPPD, with a mean age of 75 years and 48 % were females. CPPD patients were more likely to be older (75 vs 68 years; p < 0.001) compared to non-CPPD patients. Among the comorbidities, chronic kidney disease was more frequently observed in CPPD patients. Regarding the inpatient complications, acute ischemic stroke and post-procedural hemorrhage were more frequently seen in CPPD patients. Interestingly, the in-hospital mortality was lower in the CPPD patients than the non-CPPD patients (OR: 0.77; CI 95 % 0.70-0.85). ACS in CPPD patients was associated with a longer mean length of stay than those without CPPD (OR: 3.35; 95 % CI 3.17-3.53). In addition, mean total charges were higher in the CPPD group (OR: 1.04; 95 % CI 1.01-1.10)., Conclusion: ACS in CPPD patients is associated with higher healthcare utilization, including cost and length of hospital stay, and lower in-hospital mortality than non-CPPD patients., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)