Non-alcoholic steatohepatitis (NASH) is a chronic and progressive form of non-alcoholic fatty liver disease. Its global incidence is increasing and makes NASH an epidemic and a public health threat. Non-alcoholic fatty liver disease is associated with major morbidity and mortality, with a heavy burden on quality of life and liver transplant requirements. Due to repeated insults to the liver, patients are at risk for developing hepatocellular carcinoma. The progression of NASH was initially defined according to a two-hit model involving an initial development of steatosis, followed by a process of lipid peroxidation and inflammation. In contrast, current evidence proposes a “multi-hit” or “multi-parallel hit” model that includes multiple pathways promoting progressive fibrosis and oncogenesis. This model includes multiple cellular, genetic, immunological, metabolic, and endocrine pathways leading to hepatocellular carcinoma development, underscoring the complexity of this disease.
Background There are few studies to evaluate the association between iron deficiency anemia (IDA) and Crohn’s disease (CD). We examined this association in a USA-based cohort of patients with CD. Methods We queried the Nationwide Readmission Databases 2018 using the International Classification of Disease, 10th Revision, and Clinical Modification (ICD-10-CM) codes to identify all adult patients admitted with a diagnosis of CD. Primary outcomes were the prevalence of IDA among patients with CD. Secondary outcomes included inpatient mortality, the length of stay, all-cause 30-day non-elective readmission rate, and total cost of hospitalization. Multivariate regression analysis was performed to study the impact of IDA on inpatient mortality and non-elective readmissions. Results Of the 72,076 patients discharged from an index hospitalization for CD, 8.1% had IDA. CD patients with IDA had increased length of stays in days (4, interquartile range (IQR): 2 - 6 vs. 3, IQR: 2 - 5; P < 0.001), increased median total charges ($35,160, IQR: $19,786 - $64,126 vs. $31,299, IQR: $17,226 - $59,561; P < 0.001), and were more common to require blood transfusion during hospitalization (13.6% vs. 3.4%, P < 0.001) compared to CD patients without IDA, respectively. IDA was independently associated with increased odds of all-cause 30-day non-elective readmission (odds ratio (OR): 1.254, 95% confidence interval (CI): 1.154 - 1.363, P < 0.001) and increased odds of all-cause 90-day non-elective readmission (OR: 1.396, 95% CI: 1.302 - 1.498, P < 0.001). Conclusions In a large nationwide cohort of patients hospitalized for CD, we observed a significant burden of IDA. Additionally, we found a significant association between IDA and worse hospitalization outcomes.
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