Measurement of blood pressure using a portable recorder operated by the patient

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Abstract
A portable blood pressure recorder operated by the patient is described. It registers blood pressure by the conventional auscultatory method and records the results automatically. In part I of the study its accuracy was compared with simultaneous sphygmomanometer readings in the same arm. Seventy-three per cent of systolic and 82% of diastolic pressures were accurately reproduced (within 5 mm Hg) and in only 1% of instances was there poor agreement between the two methods. The causes of the discrepancies are briefly discussed. In part II of the study the recorder was used to investigate the blood pressure of seven normal and nine hypertensive patients in hospital. In both groups while the recorder was being worn, diastolic pressures were lower than in control periods in which the blood pressure was measured by the standard clinical method, which was probably due to the removal of an iatrogenic pressor influence.

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