Risk of Hyperglycemic Crisis Episode in Diabetic Patients with Bipolar Disorder: A Nationwide Population-based Cohort Study

Background: Suboptimal management of diabetes can lead to a hyperglycemic crisis episode (HCE), which could be further enhanced in the presence of bipolar disorder (BD) and the prescription of antipsychotics. This study aims to investigate the risk of HCE in diabetic patients with BD. Additionally, the duration of antipsychotic prescription on HCE risk is examined.

Methods: Using the Taiwan National Health Insurance Research Database, 6099 diabetic patients with BD and 24,378 diabetic patients without BD matched by gender, age, index year, and Charlson Comorbidity Index score were enrolled between 1999 and 2010 and followed to the end of 2013. Participants who developed HCE during the follow-up period were identified. Cox regression analysis was used to calculate the hazard ratio (HR) with 95% confidence interval (CI) of the HCE incidence rate between two groups studied.

Results: Diabetic patients with BD were associated with an increased risk of HCE compared with unaffected controls after adjusted for baseline demographics and duration of antipsychotic prescription (3.84 versus 2.71 per 1,000 person-years, HR: 1.41, 95% CI: 1.15-1.71). Also, this study revealed that male gender, more comorbidities, and a longer duration of antipsychotic prescription were potential risk factors for developing HCE.

Limitations: This study only deals with data on the duration of antipsychotic prescription, without showing the effects of different antipsychotics on HCE risk.

Conclusion: This study highlights the need to pay attention to the risk of HCE in diabetic patients with BD and the importance of careful prescription of antipsychotics to reduce the HCE incident.