Method and device for optimally altering stimulation energy to maintain capture of cardiac tissue
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United States of America Patent
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Sep 2, 2003
Grant Date -
N/A
app pub date -
Oct 5, 2000
filing date -
May 15, 2000
priority date (Note) -
Expired
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Abstract
An improved system and method for performing automatic capture/threshold detection in an implantable cardiac stimulation device or any device capable of stimulating some organ or tissue in the body. Prior art systems determine the stimulation threshold of the cardiac tissue by detecting an evoked response to a fixed duration stimulation pulse and then increasing the amplitude of the stimulation pulse by a predetermined safety margin value. Such systems are inherently based upon a belief that the chronaxie of the strength-duration curve for a particular patient is essentially fixed and that the rheobase is variable. While this may be true at some times during the patient's life, e.g., during the acute phase after lead implantation absent drug effects, it is reported that drugs alone may alter the chronaxie and it is believed that other factors may also affect the chronaxie either alone or in combination with the rheobase.
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