Comments on: Nonalcoholic Fatty Liver Disease Predicts Acute Kidney Injury Readmission in Heart Failure Hospitalizations: A Nationwide Analysis.

The article titled "Nonalcoholic Fatty Liver Disease Predicts Acute Kidney Injury Readmission in Heart Failure Hospitalizations: A Nationwide Analysis" has been read with great interest. I highly appreciate the authors' efforts to expand the knowledge on non-alcoholic fatty liver disease (NAFLD) and its association with acute kidney injury. I concur with the authors' conclusion that heart failure patients with NAFLD have an increased incidence of hospital readmissions due to acute kidney injury. Nonetheless, I would like to add a few points that would significantly enhance the value of this study and highlight areas of improvement for future research. First, the authors used a nationally representative database, which, while providing comprehensive information about patients in the United States, does not include data from other countries, thus questioning the applicability of these findings to other nations. Second, the authors should have considered ethnicity in their study design, as previous research has shown that NAFLD is more prevalent among Hispanics. Third, the authors should have commented on the important confounders: family history and socioeconomic status of patients. Patients with a family history of NAFLD have a greater propensity to develop grave manifestations of the disease early in life. Similarly, individuals with low socioeconomic status are at an increased risk of NAFLD. The study could have provided more reliable findings by matching the groups for these confounders, mitigating the risk of error and bias.