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Differentiation of central sleep apnea and obstructive sleep apnea using an implantable cardiac device

  • US 7,225,021 B1
  • Filed: 01/30/2004
  • Issued: 05/29/2007
  • Est. Priority Date: 01/30/2004
  • Status: Active Grant
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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