Monitoring Older Adult Blood Pressure Trends at Home as a Proxy for Brain Health

. 2021 Dec 24;13(3):e16. doi: 10.5210/ojphi.v13i3.11842

Blood Pressure Category	δ_S	δ_D
Normal	$\frac{S B P - 0 m m H g}{119 m m H g - 0 m m H g}$	$\frac{D B P - 0 m m H g}{79 m m H g - 0 m m H g}$
Elevated	$\frac{S B P - 120 m m H g}{129 m m H g - 120 m m H g}$	$\frac{D B P - 0 m m H g}{79 m m H g - 0 m m H g}$
Hypertension Stage 1	$\frac{S B P - 130 m m H g}{139 m m H g - 130 m m H g}$	$\frac{D B P - 80 m m H g}{89 m m H g - 80 m m H g}$
Hypertension Stage 2	$\frac{S B P - 140 m m H g}{179 m m H g - 140 m m H g}$	$\frac{D B P - 90 m m H g}{119 m m H g - 90 m m H g}$
Hypertensive Crisis	$\frac{S B P - 180 m m H g}{219 m m H g - 180 m m H g}$	$\frac{D B P - 120 m m H g}{149 m m H g - 120 m m H g}$

Table 1. Delta values are defined as a numerical representation of where a given blood pressure value falls within its blood pressure category’s range on a scale of 0 to 1. This table represents the expressions used to calculate the delta value for both SBP (δ_S) and DBP (δ_D), which are based off of the American Heart Association’s Blood Pressure Category chart.