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To the Editor: Dr Jones and colleagues¹ suggested several guidelines for maintaining the reliability of office blood pressure (BP) measurement. Even the most accurate office measurements, however, may not necessarily represent the patient's BP during daily life. Repeated readings taken in the patient's usual environment may be more useful than those taken in the physician's office for diagnosing hypertension and for adjusting therapy.^2-3 We agree with Jones et al that the accuracy of such automated measurements must be ensured.

The most widely used protocols for validating automated monitors are those of the Association for the Advancement of Medical Administration (AAMI) and the British Hypertension Society (BHS). Under both protocols, validation of a brand of automated monitor involves assessment of only a single monitor unit in 85 individuals, each tested 3 times.⁴ To pass validation, the mean error across the resulting 255 readings must be no more than 5 mm Hg . . . [Full Text of this Article]

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