Task: Answer Verification
Input (English): Question: Do elevated depression symptoms predict long-term cardiovascular mortality in patients with atrial fibrillation and heart failure?
Answer: Elevated depression symptoms are related to cardiovascular mortality even after adjustment for other prognostic indicators in patients with comorbid AF and CHF who receive optimized treatment. Unmarried patients are also at increased risk. Mechanisms and treatment options deserve additional study.
Output (English): yes