Depression Linked to Increased Risk of Developing Atrial Fibrillation
By Megan Brooks
NEW YORK—Depression appears to be a risk factor for atrial fibrillation, the most common arrhythmia in the U.S., according to new observational data from the national Multi-Ethnic Study of Atherosclerosis (MESA) study.
Considering that 20% of U.S. adults report depressive symptoms, “our findings identify a large portion of the U.S. population that is potentially at an increased risk of developing atrial fibrillation and who may benefit from more targeted efforts to prevent atrial fibrillation,” Dr. Parveen Garg, from the Keck School of Medicine at the University of Southern California in Los Angeles, told Reuters Health by email.
He presented the study March 22 at the American Heart Association's Epidemiology and Prevention/Lifestyle and Cardiometabolic Health Scientific Sessions in New Orleans.
The analysis included 6,644 adults (mean age, 62; 53% women, 38% white, 28% black, 22% Hispanic, 12% Chinese-American) with no known heart disease at baseline who were followed for a median of 13 years as part of the MESA study.
In the fully adjusted model, individuals with a Centers for Epidemiologic Studies Depression Scale (CES-D) score of 16 or higher (indicating clinically relevant depressive symptoms) had a 34% (P=0.039) higher risk of developing atrial fibrillation during follow-up compared with those with a CES-D score of less than 2. Similarly, individuals reporting antidepressant use had a significant 36% increase in their risk of developing atrial fibrillation compared with those not on the drugs.
“An important next step is to confirm these results in other studies, especially those with more comprehensive and clinically validated assessments of depression. If confirmed, then it will be important to determine if treating individuals with depression actually reduces their risk of atrial fibrillation,” Dr. Garg said.
Several mechanisms have been proposed to explain a possible link between depression and atrial fibrillation, Dr. Garg explained. Depression can increase systemic inflammation and activate the autonomic nervous system, which increases catecholamine levels, and the hypothalamic-pituitary-adrenal axis, which increases cortisol levels. Depression may also activate the renin-angiotensin-aldosterone system.
“Taken together, these changes may induce atrial fibrillation susceptibility either directly by disrupting the electrophysiologic properties of the atria or indirectly by promoting atrial fibrosis, increasing the atrial pressure,” Dr. Garg said, adding that further research is needed to fully understand the mechanisms involved.
Dr. Gordon Tomaselli, a spokesman for the American Heart Association, said this study “affirms the association between depression and atrial fibrillation in a population that I think is important because it's a mixed population and not just the standard Caucasian population.”
“There are some associated risk factors in people with depression that might increase their risk of atrial fibrillation, including an increased incidence of hypertension in some patients who have depression as well as other disorders that might be driven by activation of the sympathetic nervous system like anxiety disorder. So there are several reasons why people might have depression and atrial fibrillation,” Dr. Tomaselli, who was not involved in the research, told Reuters Health by phone.
“One question is what should we do about it, and I'm not sure we have an answer from this study except to make sure that we are looking for symptoms of depression,” he said. “We don't know whether treatment of depression will reduce the incidence of atrial fibrillation. There is some reason to think that it might, but there are other reasons to think that antidepressant drugs actually have some effects on the heart, the ion channels that determine the rhythm of the heart.”
The study had no commercial funding and the authors have no relevant disclosures.
AHA Epidemiology and Prevention - Lifestyle and Cardiometabolic Health Scientific Sessions 2018.
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