Emotional health may play a far greater role in the long-term survival of patients suffering from chronic heart failure, according to a new study that compared the mortality rates of patients based on a common screening test for depression. So much so, even patients considered to be in a sub-depressive state can also increase their risk of death.
Scientists tracked the progress of more than 1,000 cardiac patients who were screened for depression during their hospital stay using Beck's Depression Inventory (BDI), then followed them for seven years to determine if there was a correlation between test scores and mortality rates. (Generally, patients with a BDI score of 10 are considered mildly depressed, while those in the 12-19 range can vary from being mildly to moderately depressed.)
Those who had a BDI score of 10 or higher had a 44 percent greater mortality risk. Surprisingly, as the range dropped, the fatality rate climbed. Patients who scored seven or higher on the BDI had a 51 percent greater risk of death. Additionally, the correlation between BDI scores and a greater risk of death didn't take into account traditional stressors:
- Age
- Marital status
- Cardiac function
- The true cause of the cardiac problem
The great upside to these gloomy numbers: Researchers hope these results will spur doctors to pay far closer attention to their patients' psychological states, along with their physical conditions, and perhaps integrate a simple psychological assessment tool like the BDI into their practice.
Science Blog March 9, 2005
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