Medicine: Blood & Pressures

What causes high blood pressure? When 850 experts on the subject got together in Manhattan last week at a New York Heart Association conference, they had to admit that 95 times out of 100 they do not know. There were other gaps, almost as great, in their knowledge of how the disease develops and how best to treat it. Columbia University's famed Specialist George A. Perera told, with refreshing frankness, what has been learned. To some laymen, but not to all, what he had to say was reassuring.

One trouble, said Dr. Perera, is...

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