... blind in one eye. Researchers speculate that patients who received TPA later or already suffered from extensive arteriosclerosis (hardening of the arteries) did not respond as well. Some doctors also caution that the procedure poses its own ...

... between vitamin B-12 and a substance called homocysteine, which has been shown to play a role in the development of arteriosclerosis. Recent evidence suggests that elevation of homocysteine may explain many of the heart attacks that occur in individuals ...