Method and apparatus for using an optical hemodynamic sensor to identify an unstable arrhythmia
First Claim
1. A medical device comprising:
- an optical sensor for transmitting into body tissue of a patient a plurality of optical signals, receiving the plurality of signals as attenuated by transmission through the body tissue, and generating a plurality of corresponding output signals representative of an intensity of the attenuated signals as received; and
a processor for analyzing the output signals over an initial time period to assess a baseline level of motion and analyzing the output signals over a subsequent time period to determine whether a current level of motion exceeds the baseline level of motion;
wherein the processor further analyzes the output signals over the subsequent time period to determine whether the patient is experiencing a hemodynamically unstable arrhythmia.
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Abstract
A medical device identifies a hemodynamically unstable arrhythmia based upon optical hemodynamic sensor signals. The optical hemodynamic sensor includes a light source for transmitting light corresponding to first and second wavelengths through a blood perfused tissue of a patient and a light detector for generating optical signals corresponding to an intensity of the detected light at the first and second wavelengths. At a low motion period for the patient, optical signals are obtained from the optical hemodynamic sensor and are analyzed to determine a baseline motion level for the patient. Subsequent signals obtained from the optical hemodynamic sensor are compared to the baseline motion levels, with only those signals corresponding to periods where motion does not exceed the baseline level of motion being further analyzed to determine if they are consistent with a hemodynamically unstable arrhythmia.
28 Citations
20 Claims
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1. A medical device comprising:
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an optical sensor for transmitting into body tissue of a patient a plurality of optical signals, receiving the plurality of signals as attenuated by transmission through the body tissue, and generating a plurality of corresponding output signals representative of an intensity of the attenuated signals as received; and a processor for analyzing the output signals over an initial time period to assess a baseline level of motion and analyzing the output signals over a subsequent time period to determine whether a current level of motion exceeds the baseline level of motion; wherein the processor further analyzes the output signals over the subsequent time period to determine whether the patient is experiencing a hemodynamically unstable arrhythmia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device comprising:
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an optical hemodynamic sensor for producing sensor signals indicative of hemodynamic function of a patient; a processor for determining from the sensor signals whether the sensor signals are corrupt sensor signals due to patient motion or uncorrupt sensor signals, and for determining whether the patient is experiencing a hemodynamically unstable arrhythmia based upon the uncorrupt sensor signals. - View Dependent Claims (11, 12, 13)
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14. A method for detecting an unstable arrhythmia in a patient, the method comprising:
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obtaining sensor signals from an optical hemodynamic sensor, wherein the sensor signals are indicative of a hemodynamic function of the patient; determining from an initial period of the sensor signals a baseline motion level of the patient; determining from a subsequent period of the sensor signals a current motion level of the patient; and analyzing the sensor signals if the current motion level does not exceed the baseline motion level to determine whether the patient is experiencing a hemodynamically unstable arrhythmia. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification