Blood Pressure Measurement: There’s More Than Meets the Arm

Hypertension is the most important risk factor for cardiovascular events in the population worldwide. ^– Therefore, the identification of this risk factor is crucial for the assessment of cardiovascular risk. Non-invasive evaluation of blood pressure (BP) using cuffs in the arms is the recommended method for diagnosing and managing hypertension. However, this evaluation must be done properly and accurately to avoid suboptimal BP measurement and inappropriate management decisions.

The selection of cuff size is a fundamental step in evaluating BP and depends on the arm circumference of the examined individual. A smaller-than-required cuff overestimates BP, while a larger-than-required cuff underestimates BP. Some studies have reported average differences in systolic BP of 6 mmHg when inappropriately sized cuffs are used, even though markedly greater discrepancies can be observed in some individuals. In the United States, approximately 51% of adults with hypertension need large or extra-large cuffs, including 84% of those with obesity and 65% of those aged 18-34. Because obesity is highly prevalent worldwide, these American figures highlight the importance of systematic evaluation of arm circumference for accurate BP measurement in clinical practice.

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