Measuring blood pressure
First Claim
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1. A method for measuring non-invasively a blood pressure of a patient,the method comprising the steps of:
- determining a mechanical heart beat starting time point from an impedance cardiogram signal,measuring the heart to peripheral site pulse beat transit time start point by measuring an ECG QRS-complex,adding correction to the ORS-complex signal by averaging a QRS to impedance cardiogram (ICE) waveform timing point,detecting a heart beat pulse arrival time at a peripheral site of the patient by using an optical plethysmographic sensor at the peripheral site,calculating a pulse wave transit time from the heart to the peripheral site by utilizing said mechanical starting point of the heart beat and said heart beat pulse arrival time,calculating an estimate of the blood pressure of the patient from said pulse wave transit time.
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Abstract
The present invention concerns a method and a system for measuring non-invasively a blood pressure of a patient. The method comprises the steps of: determining (1603) a mechanical heart beat starting time point from an impedance cardiogram signal, detecting (1605) a heart beat pulse arrival time at a peripheral site of the patient, calculating (1607) a pulse wave transit time from the heart to the peripheral site by utilizing said mechanical starting point of the heart beat and said heart beat pulse arrival time,
- calculating (1609) an estimate of the blood pressure of the patient from said pulse wave transit time.
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10 Claims
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1. A method for measuring non-invasively a blood pressure of a patient,
the method comprising the steps of: -
determining a mechanical heart beat starting time point from an impedance cardiogram signal, measuring the heart to peripheral site pulse beat transit time start point by measuring an ECG QRS-complex, adding correction to the ORS-complex signal by averaging a QRS to impedance cardiogram (ICE) waveform timing point, detecting a heart beat pulse arrival time at a peripheral site of the patient by using an optical plethysmographic sensor at the peripheral site, calculating a pulse wave transit time from the heart to the peripheral site by utilizing said mechanical starting point of the heart beat and said heart beat pulse arrival time, calculating an estimate of the blood pressure of the patient from said pulse wave transit time. - View Dependent Claims (2, 3, 4, 5)
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6. A system for measuring non-invasively the blood pressure of a patient wherein the system comprises:
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an impedance cardiogram for determining the mechanical heart beat starting time point of a patient, an optical plethysmographic sensor at a peripheral site for determining the heart beat pulse arrival time at the peripheral site of the patient, a first calculator for calculating the pulse wave transit time from the heart to the peripheral site by utilizing said mechanical starting point of the heart beat and said heart beat pulse arrival time at the peripheral site of the patient, a second calculator for calculating the blood pressure of the patient from said pulse wave transit times, said system further arranged to measure the pulse wave transit time start point by measuring an electrocardiogram (ECG) OSR-complex; and said system arranged to add correction to the QRS-complex signal by averaging QRS to impedance cardiogram (ICG) waveform timing point. - View Dependent Claims (7, 8, 9, 10)
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Specification