Psychological Medicine

Original Articles

Symptom dimensions of post-myocardial infarction depression, disease severity and cardiac prognosis

E. J. Martensa1a2 c1, P. W. Hoena3, M. Mittelhaeusera1, P. de Jongea1a3 and J. Denolleta1

a1 CoRPS – Center of Research on Psychology in Somatic Diseases, Department of Medical Psychology, Tilburg University, The Netherlands

a2 Department of Education and Research, Catharina Hospital Eindhoven, The Netherlands

a3 Department of Psychiatry, University of Groningen, The Netherlands

Abstract

Background Individual symptoms of post-myocardial infarction (MI) depression may be differentially associated with cardiac prognosis, in which somatic/affective symptoms appear to be associated with a worse cardiovascular prognosis than cognitive/affective symptoms. These findings hold important implications for treatment but need to be replicated before conclusions regarding treatment can be drawn. We therefore examined the relationship between depressive symptom dimensions following MI and both disease severity and prospective cardiac prognosis.

Method Patients (n=473) were assessed on demographic and clinical variables and completed the Beck Depression Inventory (BDI) within the first week of hospital admission for acute MI. Depressive symptom dimensions were associated with baseline left ventricular ejection fraction (LVEF) and prospective cardiac death and/or recurrent MI. The average follow-up period was 2.8 years.

Results Factor analysis revealed two symptom dimensions – somatic/affective and cognitive/affective – in the underlying structure of the BDI, identical to previous results. There were 49 events attributable to cardiac death (n=23) or recurrent MI (n=26). Somatic/affective (p=0.010) but not cognitive/affective (p=0.153) symptoms were associated with LVEF and cardiac death/recurrent MI. When controlling for the effects of previous MI and LVEF, somatic/affective symptoms remained significantly predictive of cardiac death/recurrent MI (hazard ratio 1.31, 95% confidence interval 1.02–1.69, p=0.038). Previous MI was also an independent predictor of cardiac death/recurrent MI.

Conclusions We confirmed that somatic/affective, rather than cognitive/affective, symptoms of depression are associated with MI severity and cardiovascular prognosis. Interventions to improve cardiovascular prognosis by treating depression should be targeted at somatic aspects of depression.

(Received September 15 2008)

(Revised May 29 2009)

(Accepted July 03 2009)

(Online publication August 20 2009)

Correspondence

c1 Address for correspondence: E. J. Martens, Ph.D., CoRPS, Department of Medical Psychology, Tilburg University, Warandelaan 2, PO Box 90153, 5000 LE Tilburg, The Netherlands. (Email: e.j.martens@uvt.nl)

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