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Depression and failure of cholesterol lowering after acute myocardial infarction
Jeff C Huffman1, Felicia A Smith, Gregory L Fricchione
1Department of Psychiatry and Department of Cardiology , Massachusetts General Hospital and Harvard Medical School , Boston.
Insights
Depression following myocardial infarction (MI) hinders cholesterol reduction. Early post-MI depression was linked to significantly less improvement in lipid levels six months after the event.
Area of Science:
- Cardiology
- Psychiatry
- Preventive Medicine
Background:
- Depression after acute myocardial infarction (MI) is linked to higher cardiac mortality.
- The mechanism behind this association is not fully understood.
- The impact of post-MI depression on lipid-lowering therapy, a key secondary prevention strategy, has not been previously studied.
Purpose of the Study:
- To investigate the association between early post-MI depression and cholesterol reduction six months after MI.
- To test the hypothesis that patients with early post-MI depression exhibit inferior cholesterol reduction compared to non-depressed patients.
Main Methods:
- A prospective observational cohort pilot study enrolled patients within 72 hours of MI.
- Depression was assessed two weeks post-MI using the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID) for major depressive disorder (MDD) and the Beck Depression Inventory-II (BDI-II).
- Cholesterol levels were measured six months post-MI.
Main Results:
- Seventy subjects with available depression assessments and cholesterol data were analyzed.
- Post-MI depression, identified by both MDD interview and BDI-II, was associated with significantly poorer cholesterol reduction (8 mg/dL improvement in depressed vs. 37 mg/dL in non-depressed).
- Linear regression confirmed that depression (MDD and BDI-II) independently predicted smaller cholesterol reductions, even after accounting for demographic and medical variables (beta=-.301, P<.001 for MDD; beta=-.269, P=.001 for BDI-II).
Conclusions:
- Early depression following myocardial infarction is independently associated with impaired lipid lowering.
- These findings suggest that depression may interfere with secondary prevention efforts in post-MI patients.
- Further research is warranted to explore the mechanisms and clinical implications of this association.
Objective:
Depression after acute myocardial infarction (MI) is independently associated with cardiac mortality, but the mechanism explaining this association remains unclear. To our knowledge, there has been no prior study exploring the impact of post-MI depression on lipid lowering, a key secondary prevention measure in post-MI patients. In this prospective observational cohort pilot study, we hypothesized that patients with early post-MI depression would have inferior cholesterol reduction 6 months post-MI compared to nondepressed patients.
Method:
Patients admitted to a cardiac intensive care unit or a cardiac step-down unit between October 2003 and July 2005 were enrolled in the study within 72 hours of MI. Two weeks post-MI, subjects were assessed for depression using the module for current major depressive disorder (MDD) from the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID) and the Beck Depression Inventory-II (BDI-II). Information regarding cholesterol levels was collected 6 months after MI.
Results:
Initial and 6-month cholesterol levels were available for 70 subjects who had 2-week post-MI depression assessments. Post-MI depression, measured both using an interview for MDD and the BDI-II, was associated with inferior cholesterol reduction, with depressed subjects improving their cholesterol levels by approximately 8 mg/dL compared to a cholesterol reduction of 37 mg/dL in nondepressed subjects. Furthermore, depression diagnosed by formal MDD interview (beta=-.301; P<.001) and the BDI-II (beta=-.269; P=.001) continued to be associated with significantly smaller reductions in cholesterol levels on linear regression analyses that accounted for demographic and medical variables.
Conclusions:
In this exploratory pilot study, early post-MI depression was independently associated with impaired lipid lowering 6 months after MI.
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