Differentiation of central sleep apnea and obstructive sleep apnea using an implantable cardiac device
First Claim
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1. An implantable cardiac device comprising:
- sensing circuitry to sense whether a patient is at rest, the sensing circuitry further being operative to sense cardiac electrical activity; and
a sleep apnea detector to detect when a patient, who is at rest, is experiencing an episode of sleep apnea and to differentiate between central sleep apnea and obstructive sleep apnea based on oscillation of a parameter of the cardiac electrical activity, the cardiac electrical activity comprising evoked responses over a plurality of respiration cycles.
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Abstract
An implantable cardiac device is programmed to differentiate between central sleep apnea and obstructive sleep apnea. The implantable cardiac device utilizes a respiration-related parameter (e.g., respiration rate, tidal volume, and minute ventilation) to determine whether the patient is experiencing an episode of sleep apnea. When sleep apnea is detected, the implantable cardiac device examines the intracardiac electrogram (IEGM) to classify the apnea as either central sleep apnea or obstructive sleep apnea. The cardiac device may be further configured to administer different therapies depending upon the classification of sleep apnea.
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Citations
21 Claims
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1. An implantable cardiac device comprising:
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sensing circuitry to sense whether a patient is at rest, the sensing circuitry further being operative to sense cardiac electrical activity; and a sleep apnea detector to detect when a patient, who is at rest, is experiencing an episode of sleep apnea and to differentiate between central sleep apnea and obstructive sleep apnea based on oscillation of a parameter of the cardiac electrical activity, the cardiac electrical activity comprising evoked responses over a plurality of respiration cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable cardiac device comprising:
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a sensor that indicates rest; a sensor to sense a respiration-related parameter; a data acquisition system to acquire an intracardiac electrogram (IEGM) signal; and a processor to detect an episode of sleep apnea based on changes in the respiration-related parameter and to differentiate between central sleep apnea and obstructive sleep apnea based on oscillation of a parameter of the IEGM signal over a plurality of respiration cycles. - View Dependent Claims (9, 10, 11, 12)
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13. An implantable cardiac device comprising:
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sleep apnea detection means for detecting an episode of sleep apnea; data acquisition means for collecting an intracardiac electrogram signal; and classification means for classifying the episode as one of central sleep apnea and obstructive sleep apnea based on analysis of oscillation of a parameter of the IEGM signal over a plurality of respiration cycles. - View Dependent Claims (14, 15, 16)
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17. A method implemented by an implantable cardiac device, the method comprising:
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detecting an episode of sleep apnea; and classifying the episode of sleep apnea as either central sleep apnea or obstructive sleep apnea based upon oscillation of a parameter of an intracardiac electrogram (IEGM) signal over a plurality of respiration cycles. - View Dependent Claims (18, 19, 20, 21)
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Specification