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Metabolic demand driven rate-responsive pacemaker

  • US 5,085,215 A
  • Filed: 03/20/1990
  • Issued: 02/04/1992
  • Est. Priority Date: 03/20/1990
  • Status: Expired due to Term
First Claim
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1. A dual-chamber rate-responsive pacemaker, comprising:

  • means for generating ventricular pacing pulses,means for sensing atrial heartbeats,means responsive to said atrial heartbeat sensing means for deriving an indication of intrinsic atrial rate,sensor means for determining a metabolic indicator rate,means for determining a maximum atrial tracking rate as a function of said metabolic indicator rate,means for comparing said intrinsic atrial rate indication to said maximum atrial tracking rate, andmeans responsive to said comparing means for controlling said generating means to operate in a first mode in which ventricular pacing pulses are generated in synchrony with operations of said atrial heartbeat sensing means when said intrinsic atrial rate indication is slower than said maximum atrial tracking rate, and for controlling said generating means to operate in a second mode in which ventricular pacing pulses are generated at a rate which is a function of said metabolic indicator rate, with timing independent of said atrial heartbeat sensing means, when said intrinsic atrial rate indication exceeds said maximum atrial tracking rate,said controlling means including;

    means responsive to said comparing means for developing a record of the occurrence of recent cardiac cycles in which said intrinsic rate exceeded said maximum atrial tracking rate,decision means for deciding whether said record meets a predetermined criterion, andmeans responsive to said decision means for governing whether said ventricular pacing pulse generating means operates in said first or said second mode.

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