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External atrial defibrillator and method for personal termination of atrial fibrillation

  • US 7,085,601 B1
  • Filed: 11/17/1999
  • Issued: 08/01/2006
  • Est. Priority Date: 11/17/1999
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • receiving a cardiac signal from a patient;

    determining from the signal whether the patient is experiencing atrial fibrillation;

    receiving a shock command from an operator; and

    shocking the patient with a portable shock generator in response to the shock command if the patient is experiencing atrial fibrillation,wherein the determining comprises;

    measuring the lengths of R—

    R intervals in the signal;

    calculating the respective differences between the lengths of contiguous ones of the R—

    R intervals;

    comparing the calculated differences to a difference threshold; and

    determining that the patient is not in atrial fibrillation if one of the calculated differences is less than the difference threshold.

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