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A difference in systolic blood pressure of 15mm of mercury or more between the arms is linked to hardening of the arteries supplying blood to the legs and feet. A difference in blood pressure between the right and left arm could indicate an difference between seeing and dating risk of dying from heart disease, say doctors. They discovered that a difference in systolic blood pressure of 15mm of mercury or more between the arms is linked to hardening of the arteries supplying blood to the legs and feet. Their findings come after they reviewed 28 papers looking at variations in systolic blood pressure between the arms.

The first figure is called the systolic pressure. The study, published online in The Lancet medical journal, found that a difference of 15mm of mercury or more was linked with a 2. 5-fold extra risk of peripheral vascular disease. PVD is the narrowing and hardening of the arteries that supply blood to the legs and feet. The risk of cerebrovascular disease, which affects the blood supply to the brain and may lead to strokes, was increased 1.