Angiotensin converting enzyme inhibitors and Alzheimer disease in the presence of the apolipoprotein E4 allele.

Objective: The effect of angiotensin converting enzyme (ACE) inhibitors on Alzheimer disease (AD) remains unclear, with conflicting results reported. We studied the interaction of the Apolipoprotein E (ApoE) genotype and ACE inhibitors on AD.

Methods: This was a cross-sectional study of homebound elderly with an AD diagnosis and documentation of medications taken.

The homocysteine hypothesis of depression.

High levels of homocysteine are associated with cerebrovascular disease, monoamine neurotransmitters, and depression of mood. A plausible hypothesis for these associations is that high homocysteine levels cause cerebral vascular disease and neurotransmitter deficiency, which cause depression of mood. The homocysteine depression hypothesis, if true, would mandate inclusions of imaging studies for cerebrovascular disease and measures of homocysteine, folate, and B12 and B6 vitamins in the clinical evaluation of older depressed patients.