| 摘要 |
<p>An autocapture system within an implantable pulse generator automatically maintains the energy of a stimulation pulse at a level just above that which is needed to effectuate capture. The electrical post-stimulus signal of the heart following delivery of a stimulation pulse is compared to a polarization template (178) determined during a capture verification test. A prescribed difference between the polarization template and the post-stimulus signal (180) indicates capture has occured. Otherwise, a loss-of-capture routine is invoked (182) that increases the energy a prescribed amount to obtain capture. During a capture verification test, the pulse generator determines a polarization template for a particular stimulation energy and for each of a plurality of sensitivity or threshold settings. A determination is also made as to which sensitivity settings yield capture. An autocapture routine extends the capture verification test data to a wide range of stimulation energies.</p> |
