Data logging system for implantable cardiac device
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United States of America Patent
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Feb 18, 1997
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N/A
app pub date -
Feb 12, 1996
filing date -
Feb 12, 1996
priority date (Note) -
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Abstract
An implantable cardiac rhythm management device (pacemaker or defibrillator) having circuitry for determining the interval between two successive natural ventricular depolarization signals, includes the capability of computing and storing histogram arrays of heart rate variability data over a prolonged period, such as 24 hours. By utilizing an algorithm for generating a histographic log and a time domain log wherein a logarithmic data compression technique is implemented, the volume of HRV data collected for later telemetered readout to an external device does not exceed the memory and power capabilities of the implanted device.
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