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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

