DEAR DOCTOR K: At my last checkup, the doctor measured the blood pressure in both of my arms. Why?
DEAR READER: Your doctor had an important reason: a big difference between the two readings can indicate an increased risk of cardiovascular disease. Researchers at Harvard-affiliated Massachusetts General Hospital helped show the importance of measuring arm-to-arm differences in blood pressure. The researchers measured blood pressure in both arms in nearly 3,400 adults age 40 or older with no signs of heart disease.