Comparing Amlodipine with Amlodipine-Folic Acid for Preventing First Ischemic Stroke in Adults with H-type Hypertension and MTHFR 677 CCCT Genotype A Large Randomized, Double-Blind, Controlled Study

What this Trial Is About

Researchers are investigating the effects of amlodipine alone versus amlodipine combined with folic acid in Chinese adults aged 45 to 74 years who have H-type hypertension, specific MTHFR 677 genotypes CC or CT, elevated plasma homocysteine levels, and low serum folate. This large, multi-center, randomized, double-blind, double-dummy clinical trial aims to evaluate which treatment better reduces the risk of first ischemic stroke over five years. Participants are first screened and then enter a 2 to 4 week run-in period where they take amlodipine to assess tolerance and compliance. Afterward, eligible participants are randomized by genotype into two groups one receiving amlodipine 5mg daily with a placebo, and the other receiving amlodipine 5mg combined with 0.8mg folic acid daily with a placebo. Other blood pressure medications may be added as needed to reach target blood pressure goals. Follow-up visits occur every three months during the five-year treatment period with medication provided at each visit. Throughout the study, participants undergo interviews, clinical evaluations, and laboratory tests including genetic and blood analyses. Researchers monitor adherence, blood pressure, and cardiovascular health. The main outcome measured is the occurrence of first ischemic stroke by the end of five years. Secondary outcomes include other cardiovascular events and kidney function. Two interim analyses will be conducted during the study to assess progress and safety.

China Stroke Primary Prevention Trial 2 for Participants With H-type Hypertension and MTHFR 677 CC/CT Genotype (CSPPT2-CC/CT)