The study is published this week in the Journal of the American College of Cardiology. It builds on longstanding findings that link depression and heart disease. While the two seem to be Cleveland Clinic site on heart disease and depression fellow travelers‐one in five heart patients suffers from depression — the question of whether one causes the other remains a mystery, and an active field of research.
Having any depression symptoms increased a subject's likelihood of suffering another heart attack, stroke, heart failure or death. But even after taking account of the severity of a patient's illness and the factors that influence his or her risk of worsening health, the large numbers of patients who reported suffering depression's physical symptoms — tiredness, appetite changes, sleep disruptions — fared worse than the smaller group who reported they were extremely sad, felt guilty or worthless or had suicidal thoughts.
Many heart patients suffer from depression in the wake of a heart attack or surgery to open blocked blood vessels. But finding the symptoms of depression that seem to predict whose heart disease will worsen is important, because cardiologists can focus not only on treating patients with those symptoms most aggressively, but on treating those symptoms first, the authors wrote.
It may also suggest what kind of treatment heart patients should get, along with their heart medications and exhortations to change their diet. While psychotherapy for depression is often offered to such patients, it seems to be more effective in addressing feelings of sadness than poor sleep and appetite. Exercise programs seem to do the most to positively influence sleep and appetite, the researchers wrote.