Method and system for detection of respiratory variation in plethysmographic oximetry
First Claim
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1. A method comprising:
- retrieving, from a storage element by a waveform analysis application, a plurality of samples representing a plethysmographic waveform of a patient;
calculating, by the waveform analysis application, a power spectrum density for the plurality of samples representing the plethysmographic waveform of the patient;
detecting, by the waveform analysis application, a first wave peak of the power spectrum density and a second wave peak of the power spectrum density, wherein the first wave peak is indicative of a respiratory activity of the patient and the second wave peak is indicative of a heart rate of the patient;
determining, by the waveform analysis application, a proportion of the first wave peak to the second wave peak, andtriggering, by the waveform analysis application and responsive to the determined proportion being within a predetermined range, an alarm to alert the patient or a health care provider to the presence of pulsus paradoxus.
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Abstract
A method and system for detection of pulsus paradoxus are provided. In one embodiment, the method includes determining a power spectrum density for a plethysmographic waveform and identifying pulsus paradoxus based on the power spectrum density. The power spectrum density may include a first wave peak indicative of a respiratory rate and a second wave peak indicative of a heart rate. Pulsus paradoxus can be identified by comparing a height of the first wave peak and a height of the second wave peak.
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Citations
14 Claims
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1. A method comprising:
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retrieving, from a storage element by a waveform analysis application, a plurality of samples representing a plethysmographic waveform of a patient; calculating, by the waveform analysis application, a power spectrum density for the plurality of samples representing the plethysmographic waveform of the patient; detecting, by the waveform analysis application, a first wave peak of the power spectrum density and a second wave peak of the power spectrum density, wherein the first wave peak is indicative of a respiratory activity of the patient and the second wave peak is indicative of a heart rate of the patient; determining, by the waveform analysis application, a proportion of the first wave peak to the second wave peak, and triggering, by the waveform analysis application and responsive to the determined proportion being within a predetermined range, an alarm to alert the patient or a health care provider to the presence of pulsus paradoxus. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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at least one patient monitoring device to record data representing a physiological condition of a patient over a period of time, wherein the data comprises a plurality of samples corresponding to a respiratory activity and a plurality of samples corresponding to a heart rate; a database to store the data generated by the at least one patient monitoring device; and a waveform analysis application to; retrieve, from the database, the plurality of samples corresponding to the respiratory activity and the plurality of sample corresponding to the heart rate; calculate, using fast-Fourier transform analysis, a first wave peak of the plurality of samples corresponding to the respiratory activity and a second wave peak of the plurality of samples corresponding to the heart rate; compare a height of the first wave peak and to a height of the second wave peak; detect an abnormality indicative of pulsus paradoxus based on the comparison; and triggering, responsive to detecting the abnormality, an alarm to alert a health care provider of the abnormality. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification