National Institute Of Cardiology, Laranjeiras, Brazil

This study tests whether taking beetroot powder can help lower blood pressure and improve small blood vessel function in people with resistant hypertension (high blood pressure that doesn't respond well to standard treatments). About 50 adults with this condition will take part. …

This study looks at how small blood vessels react in people who have had a heart transplant. Researchers will use a non-invasive laser device on the skin to measure blood flow. The goal is to better understand heart and blood vessel health after transplant. About 31 participants …