Pulse Wave Velocity-to-Blood Pressure Calibration Prompting
First Claim
1. A method for prompting blood pressure (BP)-related calibrations, the method comprising:
- creating a transform comprising a calibration set including a plurality of sample pairs, where each sample pair includes a mean measurement of pulse wave velocity (PWV) correlated to a measured reference blood pressure value, where each mean PWV measurement is derived from a plurality of PWV observations;
performing a current mean PWV measurement;
performing a model utility test comparing an estimated slope of the transform to an estimated standard deviation of the slope (Test
1);
when a null hypothesis of the model utility test is rejected, performing a first normalized mean difference test comparing a current blood pressure estimate with a mean calibration reference blood pressure over the calibration set (Test
2); and
,when a null hypothesis of the first normalized mean difference test is rejected, prompting a calibration of the transform, where the calibration includes augmenting the calibration set with actual BP measurements correlated to the current mean PWV measurement.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method are provided for prompting blood pressure-related calibrations. The method relies on statistical hypothesis tests over a current measurement and an accumulated set of calibration points to determine whether the benefit of calibration, in terms of calibration diversity, outweighs the cost to the patient. The algorithm uses statistical methods to predict calibration effect without actually performing the calibration, hence, reducing the calibration ‘cost’ to the patient and increasing the diversity of calibration points and thereby improving PWV-BP transform quality. The method is applicable to both manual and automatic calibration modes.
11 Citations
21 Claims
-
1. A method for prompting blood pressure (BP)-related calibrations, the method comprising:
-
creating a transform comprising a calibration set including a plurality of sample pairs, where each sample pair includes a mean measurement of pulse wave velocity (PWV) correlated to a measured reference blood pressure value, where each mean PWV measurement is derived from a plurality of PWV observations; performing a current mean PWV measurement; performing a model utility test comparing an estimated slope of the transform to an estimated standard deviation of the slope (Test
1);when a null hypothesis of the model utility test is rejected, performing a first normalized mean difference test comparing a current blood pressure estimate with a mean calibration reference blood pressure over the calibration set (Test
2); and
,when a null hypothesis of the first normalized mean difference test is rejected, prompting a calibration of the transform, where the calibration includes augmenting the calibration set with actual BP measurements correlated to the current mean PWV measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for prompting blood pressure (BP)-related calibrations, the system comprising:
-
a PWV measurement interface comprising an electrocardiogram (ECG) sensor and a photoplethysmography (PPG) sensor for measuring ECG and PPG signals; a processor; a non-transitory memory including; a transform file comprising a calibration set including a plurality of sample pairs, where each sample pair includes a mean measurement of pulse wave velocity (PWV) correlated to a measured reference blood pressure values, where each mean PWV measurement is derived from a plurality of PWV observations; a prompting application enabled as a sequence of processor instructions for accepting a current mean PWV measurement, performing a model utility test comparing a difference between an estimated slope of the transform and its hypothesis value to an estimated standard deviation of the slope (Test
1), and when a null hypothesis of the model utility test is rejected, performing a first normalized mean difference test comparing a current blood pressure estimate with a mean calibration reference blood pressure over the calibration set (Test
2), and when a null hypothesis of the first normalized mean difference test is rejected, prompting a transform calibration. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification