Comorbid Anxiety and Depression and Their Impact on Cardiovascular Disease in Type 2 Diabetes: The Fremantle Diabetes Study Phase II
Published online on May 10, 2016
Abstract
Background
The aims were to determine whether anxious depression, defined by latent class analysis (LCA), predicts cardiovascular outcomes in type 2 diabetes and to compare the predictive power of anxious depression with Diagnostic & Statistical Manual Versions IV and 5 (DSM‐IV/5) categories of depression and generalized anxiety disorder (GAD).
Methods
Prospective observational study of 1,337 type 2 participants. Baseline assessment with the 9‐item Patient Health Questionnaire and the GAD Scale; LCA‐defined groups with minor or major anxious depression based on anxiety and depression symptoms. Cox modeling used to compare the independent impact of: (1) LCA anxious depression, (2) DSM‐IV/5 depression, (3) GAD on incident cardiovascular events and deaths after 4 years.
Results
LCA minor and major anxious depression was present in 21.9 and 7.8% of participants, respectively, DSM‐IV/5 minor and major depression in 6.2 and 6.1%, respectively, and GAD in 4.8%. There were 110 deaths, 31 cardiovascular deaths, and 199 participants had incident cardiovascular events. In adjusted models, minor anxious depression (Hazard ratio (95% confidence intervals): 1.70 (1.15–2.50)) and major anxious depression (1.90 (1.11–3.25)) predicted incident cardiovascular events and major anxious depression also predicted cardiovascular mortality (4.32 (1.35–13.86)). By comparison, incident cardiovascular events were predicted by DSM‐IV/5 major depression (2.10 (1.22–3.62)) only and cardiovascular mortality was predicted by both DSM‐IV/5 major depression (3.56 (1.03–12.35)) and GAD (5.92 (1.84–19.08)).
Conclusions
LCA‐defined anxious depression is more common than DSM‐IV/5 categories and is a strong predictor of cardiovascular outcomes in type 2 diabetes. These data suggest that this diagnostic scheme has predictive validity and clinical relevance.