Can you tell me what the normal blood pressure ranges are for a child of six?
While the average blood pressure for adults, which should be 120/80 or below, the average blood pressure for children varies with age.
For example, the average BP for a three-year-old child ranges from 86-95/44-48, while the average for a 16-year-old teen ranges from 111-120/63-67 and is much closer to that of an adult.
For your six-year-old child, the 50th percentile of BP is 93-100/53-57.
Renal artery stenosis in a young child is commonly caused by fibromuscular dysplasia. This is a genetic condition which causes aberrant growth of the muscle layer of artery walls. When it occurs in the kidney, the overgrowth reduces the blood pressure the kidney "sees," which causes the kidney to secrete chemicals to increase the blood pressure throughout the body, even though in the rest of the body the blood pressure is normal. The result is a higher than normal blood pressure, as you have seen with your child. Medicines and occationally surgery can help control blood pressure elevations in people with renal artery stenosis.
Here are some links you might find useful:
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Stress and Heart Disease
7 Ways Your Body Says You’re Stressed