Implantable cardiac assist device having differential signal detection between unipolar atrial and ventricular leads using signal morphology analysis
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United States of America Patent
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Feb 16, 1999
Grant Date -
N/A
app pub date -
Jun 6, 1997
filing date -
Jun 6, 1997
priority date (Note) -
Expired
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Abstract
A heart stimulator, operable for single-chamber and/or dual-chamber pacing, includes a first unipolar electrical lead placeable in the atrium of a heart, and a second unipolar electrical lead placeable in the ventricle of the heart. In the heart stimulator, a differential detector is connected to each of these unipolar leads and detects a differential signal representative of cardiac activity between the atrial electrode and the ventricular electrode. The differential signal is supplied to decision logic which evaluates each of those outputs including using a morphology analysis, if necessary. Depending on the type of cardiac activity identified as a result of the evaluation, the decision logic supplies a signal to a control unit in the heart stimulator to cause the therapy administered by the heart stimulator to be altered as warranted. The decision logic may also derive a respiration signal from the differential signal, which can also be used to modify the administered therapy.
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