Method for monitoring heart failure
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United States of America Patent
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Nov 12, 2002
Issued Date -
N/A
app pub date -
Dec 17, 1999
filing date -
Nov 10, 1999
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Abstract
A method for monitoring the progression of the hemodynamic status of a heart failure patient. An implantable or other ambulatory monitor senses the patient's electrocardiogram (ECG) and calculates R-R intervals. The R-R intervals are used to calculate a measure of heart rate variability (HRV). Significant excursions from the average of the HRV measure are indicative of a heart failure exacerbation. Alternatively, vascular plethysmography provides a measure of pulse amplitude. Significant reduction in pulse amplitude and pulse amplitude variability are indicative of a heart failure exacerbation. This information may be used to warn the patient or healthcare providers of changes in the patient's condition warranting attention.
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