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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.
There are approximately 3 million unintended pregnancies in the United States each year.
Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.