Systems and methods for determining when to measure a physiological parameter
First Claim
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1. A method for monitoring blood pressure (BP), the method comprising:
- (a) determining, by a processor, a current BP measurement using a non-invasive blood pressure (NIBP) device;
(b) associating, by the processor, a first reference metric value and a second reference metric value with the current BP measurement, wherein the first reference metric value is based at least in part on a reference pulse rate, and wherein the second reference metric value is at least one of a reference differential pulse transit time (DPTT), a reference pulse moment, and a reference photoplethysmograph (PPG) baseline offset;
(c) monitoring, by the processor, a first metric value and a second metric value based at least in part on a continuous non-invasive technique, wherein the first monitored metric value is based at least in part on pulse rate, and wherein the second monitored metric value is at least one of DPTT, pulse moment and PPG baseline offset;
(d) computing, by the processor, a first difference based at least in part on the first monitored metric value and the first reference metric value;
(e) computing, by the processor, a second difference based at least in part on the second monitored metric value and the second reference metric value;
(f) computing, by the processor, a composite metric based on the first difference and the second difference;
(g) updating, by the processor, the current BP measurement using the NIBP device when the composite metric exceeds a threshold;
(h) determining, by the processor, at least one calibration coefficient of a photoplethysmography based non-invasive blood pressure (PNIBP) calculation formula when the composite metric exceeds the threshold; and
(i) determining, by the processor, a physiological parameter using a device that is calibrated using the at least one calibration coefficient.
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Abstract
Systems and methods are provided for determining when to update a blood pressure measurement. The value of a physiological metric may be monitored and compared to a reference value. A patient monitoring system may compute a difference between a monitored metric and a reference value, and compare the difference to a threshold value to determine whether to update a blood pressure measurement. The threshold value may be constant or variable, and may depend on the monitored metric.
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20 Claims
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1. A method for monitoring blood pressure (BP), the method comprising:
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(a) determining, by a processor, a current BP measurement using a non-invasive blood pressure (NIBP) device; (b) associating, by the processor, a first reference metric value and a second reference metric value with the current BP measurement, wherein the first reference metric value is based at least in part on a reference pulse rate, and wherein the second reference metric value is at least one of a reference differential pulse transit time (DPTT), a reference pulse moment, and a reference photoplethysmograph (PPG) baseline offset; (c) monitoring, by the processor, a first metric value and a second metric value based at least in part on a continuous non-invasive technique, wherein the first monitored metric value is based at least in part on pulse rate, and wherein the second monitored metric value is at least one of DPTT, pulse moment and PPG baseline offset; (d) computing, by the processor, a first difference based at least in part on the first monitored metric value and the first reference metric value; (e) computing, by the processor, a second difference based at least in part on the second monitored metric value and the second reference metric value; (f) computing, by the processor, a composite metric based on the first difference and the second difference; (g) updating, by the processor, the current BP measurement using the NIBP device when the composite metric exceeds a threshold; (h) determining, by the processor, at least one calibration coefficient of a photoplethysmography based non-invasive blood pressure (PNIBP) calculation formula when the composite metric exceeds the threshold; and (i) determining, by the processor, a physiological parameter using a device that is calibrated using the at least one calibration coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for monitoring blood pressure (BP), the system comprising:
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at least one sensing device; a signal input configured to receive at least one physiological signal of a subject from the at least one sensing device; a non-invasive blood pressure (NIBP) device; and a processor coupled to the signal input and to the NIBP device and configured to; (a) determine a current BP measurement using the NIBP device; (b) associate a first reference metric value and a second reference metric value with the current BP measurement based at least in part on the at least one physiological signal, wherein the first reference metric value is based at least in part on a reference pulse rate and the second reference metric value is at least one of a reference differential pulse transit time (DPTT), a reference pulse moment, and a reference photoplethysmograph (PPG) baseline offset; c) monitor a first metric value and a second metric value based at least in part on a continuous noninvasive technique and on the at least one physiological signal, wherein the first monitored metric value is based at least in part on pulse rate and the second monitored metric value is at least one of DPTT, pulse moment, and PPG baseline offset; (d) compute a first difference based at least in part on the first monitored metric value and the first reference metric value; (e) compute a second difference based at least in part on the second monitored metric value and the second reference metric value; (f) compute a composite metric based on the first difference and the second difference; (g) update the current BP measurement using the NIBP device when the composite metric exceeds a threshold; (h) determine at least one calibration coefficient of a photoplethysmography based non-invasive blood pressure (PNIBP) calculation formula when the composite metric exceeds the threshold; and (i) determine a physiological parameter using a device that is calibrated using the at least one calibration coefficient. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification