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March 25, 1974

Towards More Accurate Blood Pressure Readings

JAMA. 1974;227(12):1381. doi:10.1001/jama.1974.03230250013005

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To the Editor.—  The accompanying illustration shows a device that facilitates the determination of blood pressures when both patient and observers are seated, as in a doctor's office. A hole is drilled in the upper platform of the jack and the base of the sphygmomanometer, the two components being fastened together with a nut and bolt to form a rigid unit. With the adjustable jack, the instrument is raised until the mercury meniscus is at or near the same horizontal level as the eye, thus reducing errors due to parallax. Accuracy is also improved because the observer is seated more comfortably.