Method and system utilizing SpO2 plethysmograph signal to qualify NIBP pulses
First Claim
1. A method of monitoring the blood pressure of a patient, the method comprising the steps of:
- providing a non-invasive blood pressure (NIBP) monitor having a selectively inflatable and deflatable blood pressure cuff and at least one pressure transducer for detecting oscillation pulses from the patient;
acquiring a plethysmographic waveform of the patient, the plethysmographic waveform having a series of time-spaced plethysmographic pulses each representing a patient heartbeat;
inflating the blood pressure cuff to an initial inflation pressure;
deflating the pressure cuff through a series of pressure steps;
detecting the beginning of an oscillation pulse at each pressure step;
determining the amplitude of the detected oscillation pulse from the pressure transducer at each pressure step;
determining an expected time differential between the detection of the oscillation pulse and the detection of the plethysmographic pulse resulting from a common patient heartbeat;
storing the amplitude of the oscillation pulse;
monitoring for the presence of the plethysmographic pulse within the expected time differential following the detection of the oscillation pulse at each pressure step; and
discarding the stored amplitude when the plethysmographic pulse is absent within the average time differential.
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Abstract
A method and system for operating a non-invasive blood pressure monitor that utilizes an SpO2 plethysmographic signal to reduce the time required to obtain an estimation of a patient'"'"'s blood pressure. During operation of the NIBP monitor, the NIBP monitor utilizes the SpO2 plethysmographic signal to determine a timing period and a deflation period for each pulse associated with the patient'"'"'s heartbeat. Upon receiving an oscillation pulse, the NIBP monitor determines the oscillation amplitude during the timing period and deflates the blood pressure cuff during the deflation period immediately following the timing period. Preferably, the deflation period occurs during the same oscillation pulse used to calculate the oscillation pulse amplitude to decrease the amount of time required to obtain a blood pressure estimate from the patient.
45 Citations
18 Claims
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1. A method of monitoring the blood pressure of a patient, the method comprising the steps of:
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providing a non-invasive blood pressure (NIBP) monitor having a selectively inflatable and deflatable blood pressure cuff and at least one pressure transducer for detecting oscillation pulses from the patient; acquiring a plethysmographic waveform of the patient, the plethysmographic waveform having a series of time-spaced plethysmographic pulses each representing a patient heartbeat; inflating the blood pressure cuff to an initial inflation pressure; deflating the pressure cuff through a series of pressure steps; detecting the beginning of an oscillation pulse at each pressure step; determining the amplitude of the detected oscillation pulse from the pressure transducer at each pressure step; determining an expected time differential between the detection of the oscillation pulse and the detection of the plethysmographic pulse resulting from a common patient heartbeat; storing the amplitude of the oscillation pulse; monitoring for the presence of the plethysmographic pulse within the expected time differential following the detection of the oscillation pulse at each pressure step; and discarding the stored amplitude when the plethysmographic pulse is absent within the average time differential. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of monitoring the blood pressure of a patient, the method comprising the steps of:
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providing a non-invasive blood pressure (NIBP) monitor having a selectively inflatable and deflatable blood pressure cuff and at least one pressure transducer for detecting oscillation pulses from the patient; acquiring a plethysmographic waveform of the patient, the plethysmographic waveform having a series of time-spaced plethysmographic pulses each representing a patient heartbeat; inflating the blood pressure cuff to an initial inflation pressure; deflating the pressure cuff through a series of pressure steps; detecting the beginning of an oscillation pulse at each pressure step; determining the amplitude of the detected oscillation pulse from the pressure transducer at each pressure step; determining an expected time differential between the detection of the oscillation pulse and the detection of the plethysmographic pulse resulting from a common patient heartbeat; storing the amplitude of the oscillation pulse; monitoring for the presence of the plethysmographic pulse within the expected time differential following the detection of the oscillation pulse at each pressure step; and assigning a weighting factor to the stored amplitude based upon the timing between the plethysmographic pulse and the cuff oscillation pulse. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A system for determining the blood pressure of a patient, comprising:
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a non-invasive blood pressure (NIBP) monitor including a central processor and a display; a blood pressure cuff positionable on the patient, the blood pressure cuff being selectively inflatable and deflatable by the NIBP monitor; a pressure transducer associated with the blood pressure cuff and coupled to the central processor, the pressure transducer being operable to detect oscillation pulses from the patient for each heartbeat of the patient; and a sensing system configured to provide a plethysmographic waveform having a series of time-spaced plethysmographic pulses each representing a patient heartbeat; wherein the central processor determines an amplitude for each oscillation pulse and records and weights the amplitude based upon a timing comparison between the oscillation pulse and the plethysmographic pulse for a common patient heartbeat. - View Dependent Claims (17, 18)
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Specification