National Institute Of Cardiology, Laranjeiras, Brazil

This study tests whether beetroot powder, which is rich in nitrates, can help lower blood pressure in people with resistant hypertension (high blood pressure that doesn't respond well to standard medications). Researchers will monitor blood pressure changes in 50 participants ove…

This study looks at how small blood vessels work in people who have had a heart transplant. Researchers will use a non-invasive laser device to measure skin blood flow. The goal is to learn more about heart health after transplant, not to test a new treatment. About 31 participan…