The association of co-morbid symptoms of depression and anxiety with all-cause mortality and cardiac rehospitalization in patients with heart failure.

BACKGROUND

Patients with heart failure (HF) experience multiple psychologic symptoms. Depression and anxiety are independently associated with survival. Whether co-morbid symptoms of anxiety and depression are associated with outcomes in patients with HF is unknown.

OBJECTIVE

To determine whether co-morbid symptoms of depression and anxiety are associated with all-cause mortality or rehospitalization for cardiac causes in patients with HF.

METHOD

A total of 1260 patients with HF participated in this study. Cox regression analysis was used to determine whether co-morbid symptoms of depression and anxiety independently predicted all-cause mortality and cardiac rehospitalization. Anxiety and depression were treated first as continuous-level variables, then as categorical variables using standard published cut points. Patients were then divided into 4 groups based on the presence of anxiety and depression symptoms.

RESULTS

When entered as a continuous variable, the interaction between anxiety and depression (hazard ratio = 1.02; 95% CI: 1.01-1.03; p = 0.002) was a significant predictor of all-cause mortality in patients with HF. When entered as a categorical variable, co-morbid symptoms of depression and anxiety (vs no symptoms or symptoms of anxiety or depression alone) independently predicted all-cause mortality (hazard ratio = 2.59; 95% CI: 1.49-4.49; p = 0.001). None of the psychologic variables was a predictor of cardiac rehospitalization in patients with HF whether using the continuous or categorical level of measurement.

CONCLUSION

To improve mortality outcomes in patients with HF, attention must be paid by health care providers to the assessment and management of co-morbid symptoms of depression and anxiety.