Diabetes Does Not Worsen Outcomes of Patients Admitted for Hyperthyroidism: Analysis of the National Inpatient Sample

Introduction: Both diabetes mellitus (DM) and hyperthyroidism are common diseases. However, it is unclear if co-existing DM worsens outcomes in patients with hyperthyroidism. This study aims to compare the outcomes of patients primarily admitted for hyperthyroidism with and without a secondary diagnosis of DM. Methods: Data were extracted from the National Inpatient Sample (NIS) 2016 and 2017 Database. NIS is the largest inpatient hospitalization database in the United States. The NIS was searched for hospitalizations for adult patients with hyperthyroidism as principal diagnosis with and without DM as secondary diagnosis using ICD 10 codes. The primary outcome was inpatient mortality. Hospital length of stay (LOS), total hospital charges and NSTEMI were secondary outcomes of interest. Multivariate logistic and linear regression analysis was used accordingly to adjust for confounders. Results: There were over 71 million hospitalizations in the combined NIS 2016 and 2017 database. Out of 17,705 hospitalizations for hyperthyroidism, 2,160 (15.9%) had DM. Hospitalizations for hyperthyroidism with DM had similar inpatient mortality [0.35% vs 0.50%, AOR 0.25, 95% CI (0.05–1.30), P= 0.101], total hospital charge [$47,001 vs $36,978 P=0.220], LOS [4.50 vs 3.48 days, P=0.050] and NSTEMI compared to those without DM. Conclusion: Hospitalizations for hyperthyroidism with DM had similar inpatient mortality, total hospital charges, LOS and odds of undergoing ablation compared to those without obesity.