Validity of self blood pressure measurement in the control of the hypertensive patient: factors involved.

Background: Improving clinical practice aimed at controlling hypertension is a pending issue in health systems. One of the methods currently used for this purpose is self blood pressure measurement (SBPM) whose use increases every day. The aims of this study are to establish the optimal cut-off point for the 3-day SMBP protocol and to identify factors that could affect the precision of the 3-day SMBP protocol using 24-h ambulatory blood pressure monitoring (ABPM) as a reference.