Alzheimer's, Dementia & Mental Health
Depression in Older People with Coronary Artery Disease Points to Cognitive Decline
Findings highlight need for longer-term monitoring of depressive symptom severity and change by clinicians, caregivers
March 8, 2012 - Persistent depression symptoms may be associated with significantly greater declines in cognitive
performance in senior patients with coronary artery disease, who underwent cardiac catheterization, according to a study published in the
March issue of Archives of General Psychiatry, one of the JAMA/Archives journals.
Relatively high rates of depression have been observed among older patients with coronary artery disease, including those
undergoing coronary interventions, but it remains unknown whether depressive symptoms exacerbate their risk for long-term cognitive decline,
the authors write in their study background.
Elizabeth A. Freiheit, M.A., of the University of Calgary, Alberta, Canada, and colleagues examined the association
between depression symptoms and longer-term (less than or equal to 30 months after the procedure) changes in some areas of cognitive
performance among older patients undergoing coronary catheterization, who subsequently received coronary artery bypass graft (CABG) procedures,
percutaneous coronary intervention (PCI) or medical therapy (MT) after catheterization.
They also examined whether any associations were influenced by the presence of the apolipoprotein E (APOE) ε4 allele
(believed to be a genetic risk factor for Alzheimer disease). The study included 350 patients, 60 years or older, who underwent nonemergency
catheterization without prior revascularization.
"In longitudinal models adjusted for age, sex, educational level and baseline cognitive performance, those with
persistent symptoms exhibited significantly greater decline at 30 months (relative to baseline) in attention/executive function,
learning/memory, verbal fluency and global cognition compared with those with no or baseline-only depressive symptoms," the authors comment.
The investigators also note that persistent symptoms within the first year also were a significant risk factor for
subsequent decline (from 12 to 30 months) across all four cognitive measures. For global cognition, and to a lesser extent verbal fluency,
they suggest that the magnitude of the decline was greater for patients with the APOE ε4 allele.
"Consequently, a one-time assessment of depressive symptoms may be inadequate for detecting those at risk of longer-term
adverse cognitive and functional outcomes," the authors conclude. "These findings illustrate the need for longer-term monitoring of depressive
symptom severity and change by clinicians and other caregivers."
The study was supported by the Canadian Institutes of Health Research (CIHR) Institute of Aging, the Medical Services
(Alberta) Incorporated Foundation and the Brenda Strafford Foundation Chair in Geriatric Medicine. Some authors also disclosed support. Please
see the article for additional information, including other authors, author contributions and affiliations, financial disclosures, funding and
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