Homocysteine, hypertension and stroke

Area of Science:

• Cardiovascular epidemiology
• Nutritional biochemistry
• Genetics

Background:

• Observational studies suggest elevated homocysteine is associated with increased risk of carotid artery disease and stroke.
• Concerns exist regarding confounding factors like renal impairment, diet, and smoking in hyperhomocysteinemia.
• The link between hyperhomocysteinemia and hypertension is limited and inconsistent.

Purpose of the Study:

• To highlight the need for prospective studies on homocysteine and vascular disease.
• To emphasize the requirement for research on confounding factors and interactions with other risk factors.
• To call for studies investigating the homocysteine-hypertension relationship.

Main Methods:

• Review of existing observational and genetic studies.
• Identification of gaps in current research, particularly prospective studies.
• Call for studies with robust data on confounders and precise homocysteine measurements.

Main Results:

• Current evidence is largely observational, with a paucity of prospective studies.
• Genetic factors like MTHFR polymorphism are not consistently linked to stroke.
• Inconsistent evidence exists for the association between homocysteine and hypertension.

Conclusions:

• Additional prospective studies are needed to establish a causal link between homocysteine and vascular disease, including stroke and hypertension.
• Understanding the homocysteine-stroke relationship requires characterizing the association's form (linear vs. threshold) and interactions with risk factors.
• Randomized controlled trials of homocysteine-lowering interventions are ultimately necessary to confirm a causal role.