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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.