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Automatic atrial pacing threshold determination utilizing an external programmer and a surface electrogram

  • US 5,458,623 A
  • Filed: 03/04/1994
  • Issued: 10/17/1995
  • Est. Priority Date: 03/04/1994
  • Status: Expired due to Fees
First Claim
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1. A method of determining a minimum energy of a pacing pulse necessary to evoke an atrial depolarization response in the heart of a patient, comprising the steps of:

  • (a) generating a series of test atrial pacing pulses of sequentially decreasing energy;

    obtaining a surface electrogram representing evoked atrial responses to said atrial pacing pulses;

    each evoked atrial response being characterized by a corresponding morphology;

    (c) performing morphological analyses on an initial plurality of evoked atrial responses and generating a morphology template of the results of said analyses;

    (d) comparing the morphology of each subsequent evoked test atrial response with said template and, if they are similar, then repeating steps (b) and (c) for the next evoked test atrial response; and

    (e) concluding that a minimum energy may have been determined when the morphology of an evoked test atrial response is not similar to said template.

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