Ambulatory monitoring of blood pressure. Validation of a method

Before the routine use of our ambulatory blood pressure (ABP) device, we did the correlation analysis of 153 pairs of blood pressure measurements within the ABP and gold-standard sphygmomanometer. We got a good correlation but a systematic statistical error about less 7 mmHg on systolic measurement and 11 mmHg on diastolic measurement by the ABP device. The different qualities found among the devices that we have in the market, lead to the proposal of protocols of validation in the premarketing and periodic quality assessment by the clinics.