METHOD AND APPARATUS FOR NON-INVASIVE CUFF-LESS BLOOD PRESSURE ESTIMATION USING PULSE ARRIVAL TIME AND HEART RATE WITH ADAPTIVE CALIBRATION
First Claim
1. A method for estimating a blood pressure, comprising:
- estimating a pulse arrival time (PAT);
estimating a heart rate (HR); and
estimating the blood pressure based on the estimated PAT and HR.
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Abstract
Certain aspects of the present disclosure relate to a method for estimating a blood pressure using both a pulse arrival time (PAT) and an instantaneous heart rate (HR). The PAT can be measured as the delay between QRS peaks in an electrocardiogram (ECG) signal and corresponding points in a photoplethysmogram (PPG) waveform. Parameters of the estimation model can be determined through an initial training. Then, the model parameters can be recalibrated in constant intervals using the recursive least square (RLS) approach combined with a smooth bias fixing. The proposed estimation algorithm is applied on a multi-parameter intelligent monitoring for intensive care (MIMIC) database, and the results are compared with estimation methods that use PAT only or HR only. The proposed estimation algorithm meets, on average, the Association for the Advancement of Medical Instrumentation (AAMI) requirements and outperforms other methods from the prior art. It is also shown in the present disclosure that the proposed estimation algorithm is robust to unknown skew between the ECG and PPG signals.
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Citations
49 Claims
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1. A method for estimating a blood pressure, comprising:
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estimating a pulse arrival time (PAT); estimating a heart rate (HR); and estimating the blood pressure based on the estimated PAT and HR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for estimating a blood pressure, comprising:
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a first estimating circuit configured to estimate a pulse arrival time (PAT); a second estimating circuit configured to estimate a heart rate (HR); and a third estimating circuit configured to estimate the blood pressure based on the estimated PAT and HR. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for estimating a blood pressure, comprising:
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means for estimating a pulse arrival time (PAT); means for estimating a heart rate (HR); and means for estimating the blood pressure based on the estimated PAT and HR. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A computer-program product for estimating a blood pressure, comprising a computer-readable medium comprising instructions executable to:
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estimate a pulse arrival time (PAT); estimate a heart rate (HR); and estimate the blood pressure based on the estimated PAT and HR.
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47. A medical sensing device, comprising:
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a sensor configured to sense a plurality of signals; a first estimating circuit configured to estimate a pulse arrival time (PAT) based on at least two of the sensed signals; a second estimating circuit configured to estimate a heart rate (HR) based on at least one of the sensed signals; a third estimating circuit configured to estimate a blood pressure based on the estimated PAT and HR; and a user interface configured to provide an indication based on the estimated blood pressure.
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48. A watch, comprising:
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a first estimating circuit configured to estimate a pulse arrival time (PAT); a second estimating circuit configured to estimate a heart rate (HR); a third estimating circuit configured to estimate a blood pressure based on the estimated PAT and HR; and a user interface configured to provide an indication based on the estimated blood pressure.
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49. A monitoring device, comprising:
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a connector; a receiver configured to receive via the connector a plurality of signals; a first estimating circuit configured to estimate a pulse arrival time (PAT) based on at least two of the received signals; a second estimating circuit configured to estimate a heart rate (HR) based on at least one of the received signals; a third estimating circuit configured to estimate a blood pressure based on the estimated PAT and HR; and a user interface configured to provide an indication based on the estimated blood pressure.
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Specification