Monitor for blood pressure and other arterial properties
A method and apparatus for monitoring arterial properties, including systolic and diastolic pressure levels, of a subject is provided, in which a hardware processor receives and analyzes ballistocardiogram (BCG) data of the subject. A non-transient computer readable medium, accessible by the hardware processor, contains instructions that, when executed by the hardware processor, identify features of the BCG waveform and determine the arterial properties therefrom. For example, a diastolic pressure level may be determined from a time interval between the ‘I’ and ‘J’ peaks of the waveform and a systolic pressure level determined from the amplitude difference between the ‘J’ and ‘K’ peaks of the waveform in combination with the ‘I-J’ time interval or amplitude difference. A physical mechanism for the BCG data is disclosed that enables other arterial properties of the subject to be determined from the BCG data alone or from the BCG data in combination with other measurements.
1. A blood pressure monitor for sensing systolic and diastolic pressure levels of a subject, the blood pressure monitor comprising:
a sensor configured to provide ballistocardiogram data in response to cardiac forces acting on the subject, where the ballistocardiogram data comprises a waveform having ‘I’, ‘J’ and ‘K’ peaks;
a hardware processor configured to receive the ballistocardiogram data; and
a non-transient computer readable medium accessible by the hardware processor and containing instructions that, when executed by the hardware processor, perform a method comprising:
determining the diastolic pressure level from a time interval between the ‘I’ and ‘J’ peaks of the waveform;
determining an amplitude difference between the ‘J’ and ‘K’ peaks of the waveform;
determining a pulse pressure level from the amplitude difference between the ‘J’ and ‘K’ peaks of the waveform; and
determining the systolic pressure level from the pulse pressure level and the diastolic pressure level;
where the systolic and diastolic pressure levels are provided as outputs from the blood pressure monitor; and
screening the subject for vascular diseases utilizing the systolic and diastolic pressure levels that are provided as outputs from the blood pressure monitor.
2. The blood pressure monitor of claim 1 , where the sensor comprises a force plate.
3. The blood pressure monitor of claim 1 , where the sensor comprises a bed.
4. The blood pressure monitor of claim 1 , where the sensor comprises a chair.
5. The blood pressure monitor of claim 1 , where the sensor comprises an acceleration, velocity, or displacement sensor.
6. The blood pressure monitor of claim 1 , where the sensor comprises one or more body-mountable devices configured to sense whole-body motion in response to cardiac forces.
7. The blood pressure monitor of claim 6 , where the one or more body-mountable devices configured to sense whole-body motion in response to cardiac forces comprises an accelerometer.
8. The blood pressure monitor of claim 1 , where the non-transient computer readable medium is configured to store calibration data that is used in determining the pulse pressure level from the amplitude difference between the ‘J’ and ‘K’ peaks of the waveform.
9. The blood pressure monitor of claim 1 , where the non-transient computer readable medium is configured to store calibration data that is used in determining the diastolic pressure level from the time interval between the ‘I’ and ‘J’ peaks of the waveform.
10. The blood pressure monitor of claim 1 , further comprising a user interface configured to display the systolic and diastolic pressure levels.