Investigating the Sources of Variability in Blood Pressure Monitoring Systems

Accurate and reliable blood pressure measurement is critical for diagnosing and managing hypertension properly. Based on a consensus document announced in the Journal of Hypertension, this is so much so that a 5.0 mm Hg BP measurement error can result in incorrect hypertension classification in 84 million individuals worldwide. Understanding how BP measurement goes wrong and how to tackle them can improve the diagnosis and management of hypertension. Unfortunately, BP measurement is problematically performed in clinical practice, accumulating errors that inappropriately alter management decisions in 20% to 45% of cases. In this study, the sources of variability from the aspects of the blood pressure monitoring system were attempted to be scrutinized. The variability increases with additive properties such as pressure gauge inaccuracy, cuff tightness, and cloth over-measurement. An artificial plastic arm was created to measure the pressure with multiple monitors. The study concluded that each monitor had its inherent characteristics in increasing monitor pressures concerning the actual pressure, and further, the increases in cuff loosening distance and the cloth-over layers might cause more significant variability, as hypothesized in this study. The study could more clearly verify the reason for blood pressure measurement variability.