Fat arms, obesity and choice of blood pressure cuff size in diabetic patients.

Four hundred consecutive diabetic patients had their mid-arm circumference (AC) measured and body mass index (BMI) calculated to determine the proportion of an unselected clinic group who would require a larger than standard adult blood pressure (BP) cuff and whether or not BMI could be used to predict AC and hence choice of appropriate BP cuff size. More than 75% of both men and women had an AC > or = 29cm, justifying a larger than standard adult cuff for their BP measurement. When patients were classified according to their BMI, at least 80% with a BMI > or = 30 and more than 70% with a BMI of 25-29 had a measured AC > or = 29cm, while less than a third of patients with a BMI > or = 25 had an AC > or = 29cm. These results indicate that, in a diabetic clinic, most patients with a BMI > or = 25 are likely to require an alternative adult BP cuff if their blood pressure is to be measured precisely.