Devices and methods for assessing motor point electromyogram as a biomarker
First Claim
1. A method of diagnosing or tracking the progression or treatment of a neurological disorder that affects the function of a diaphragm, the method comprising:
- measuring a first EMG signal during a volitional breathing maneuver at an initial recording time before the start of therapy from one or more electrodes chronically implanted in a diaphragm;
measuring a second EMG signal from the same one or more electrodes at a later recording time during a volitional breathing maneuver after the start of the therapy; and
comparing one or more characteristics of the first EMG signal and the second EMG signal and characterizing the presence, progression or treatment of a neurological disorder based on the comparison.
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Accused Products
Abstract
Described herein are methods of detecting the presence or progression of neuromuscular disorders (including ALS) based at least in part on diaphragm EMG signals taken at different points in time from the same implanted electrode(s). Signals may be used to diagnose or to monitor progression of a disorder or to track a treatment. Thus, diaphragm EMG signal may be used as a marker (e.g., a “biomarker”) for the detection or progression of a neurological disorder such as ALS. The characteristics or parameters of diaphragm EMG signals may be used to create an activity index, which may be output or compared and further analyzed. These signals may also be analyzed to show a difference between the left and right sides of the diaphragm.
184 Citations
28 Claims
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1. A method of diagnosing or tracking the progression or treatment of a neurological disorder that affects the function of a diaphragm, the method comprising:
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measuring a first EMG signal during a volitional breathing maneuver at an initial recording time before the start of therapy from one or more electrodes chronically implanted in a diaphragm; measuring a second EMG signal from the same one or more electrodes at a later recording time during a volitional breathing maneuver after the start of the therapy; and comparing one or more characteristics of the first EMG signal and the second EMG signal and characterizing the presence, progression or treatment of a neurological disorder based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 20, 23)
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14. A method of diagnosing or tracking the progression or treatment of a neurological disorder that affects the function of a patient'"'"'s diaphragm, the method comprising:
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determining a first activity index from a patient'"'"'s diaphragm motor point EMG at a first time during a volitional breathing maneuver before the start of a therapy, wherein the first activity index is a first measure of a first component of the EMG that is combined with a first measure of a respiratory parameter value; determining a second activity index from the patient'"'"'s diaphragm motor point EMG at a second time during a volitional breathing maneuver after the start of the therapy, wherein the second activity index is a second measure of the first component of the EMG that is combined with a second measure of the respiratory parameter value; comparing the first activity index and the second activity index; and characterizing the presence, progression or treatment of a neurological disorder based on the comparison between the first activity index and the second activity index, wherein the first activity index and the second activity index are determined from a chronically implanted electrode for measuring the patient'"'"'s diaphragm motor point EMG at a first time and at a second time. - View Dependent Claims (15, 16, 17, 18, 19, 21, 22, 24, 25, 26, 27, 28)
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Specification