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Methods for adjusting cardiac detection criteria and implantable medical devices using same

  • US 6,873,870 B2
  • Filed: 04/30/2001
  • Issued: 03/29/2005
  • Est. Priority Date: 04/30/2001
  • Status: Active Grant
First Claim
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1. A method for distinguishing a hemodynamically stable tachycardia from a hemodynamically unstable tachycardia, comprising:

  • sensing a heart rate;

    comparing the heart rate to a heart rate threshold value;

    monitoring a blood pressure sensor upon detecting the heart rate greater than the heart rate threshold value to detect a substantial drop in blood pressure;

    invoking a first number of intervals detected (NID) threshold up detecting the heart rate greater than the heart rate threshold value if a substantial drop in blood pressure is not detected;

    invoking a second NID threshold that is lower than the first NID threshold upon detecting a substantial drop in blood pressure;

    counting a consecutive number at intervals in which the heart rate is greater than the heart rate threshold value;

    making a tachycardia detection if the consecutive number of intervals satisfies the invoked NID threshold, the tachycardia detection being a detection of a hemodynamically stable tachycardia if the first NID threshold is invoked and the tachycardia detection being a detection of a hemodynamically unstable tachycardia if the second NID threshold is invoked; and

    delivering a first low power tachycardia response therapy upon making a tachycardia detection that the tachycardia is a hemodynamically stable tachycardia and delivering a second high power tachycardia response therapy upon detection that the tachycardia that is a hemodynamically unstable tachycardia.

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