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Apparatus and method for controlling multiple sensitivities in arrhythmia control system including post therapy packing delay

  • US 4,940,054 A
  • Filed: 04/29/1988
  • Issued: 07/10/1990
  • Est. Priority Date: 04/29/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for administering electrotherapy to the heart comprising:

  • a detector responsive to an electrical signal from the heart, said detector providing an output signal in response to said electrical signal;

    sensitivity control means connected to said detector for controlling the sensitivity of said detector to said electrical signal, said sensitivity control means controlling said sensitivity to a first sensitivity level at a first time;

    tachyarrhythmia detection means for receiving said output signal from said detector set at said first sensitivity level to determine if a tachyarrhythmia is sensed at said first time;

    tachyarrhythmia confirmation means for receiving said output signal from said detector set at said first sensitivity level to confirm the presence of said tachyarrhythmia at a second time after said first time;

    tachyarrhythmia therapy means for delivering tachyarrhythmia therapy to the heart if said tachyarrhythmia confirmation means confirms the presence of tachyarrhythmia at said second time;

    said sensitivity control means controlling said sensitivity of said detector to a second sensitivity level if a tachyarrhythmia is not sensed by said detector at said second time, said second sensitivity level being higher than said first sensitivity level; and

    said tachyarrhythmia therapy means delivering tachyarrhythmia therapy if said detector, at said second sensitivity level, detects tachyarrhythmia.

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