IMPLANTABLE HEART FAILURE MONITOR
First Claim
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1. A method for monitoring a heart failure patient, the method comprising:
- sensing a first signal responsive to oxygen availability in an extravascular volume of skeletal muscle tissue in the patient and computing a tissue oxygenation measurement using the first signal;
detecting a change in the tissue oxygenation measurement;
computing a time interval corresponding to the detected change in muscle tissue oxygenation; and
detecting if a heart failure condition is worsening in response to the computed time interval.
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Abstract
An implantable medical device and associated method monitor a heart failure patient by sensing a signal responsive to oxygen availability in an extravascular volume of skeletal muscle tissue. The signal is used to compute a tissue oxygenation measurement. A change in the tissue oxygenation measurement is detected, and a time interval corresponding to the detected change in muscle tissue oxygenation is computed. The time interval is used for detecting if a heart failure condition is worsening or improving.
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Citations
24 Claims
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1. A method for monitoring a heart failure patient, the method comprising:
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sensing a first signal responsive to oxygen availability in an extravascular volume of skeletal muscle tissue in the patient and computing a tissue oxygenation measurement using the first signal; detecting a change in the tissue oxygenation measurement; computing a time interval corresponding to the detected change in muscle tissue oxygenation; and detecting if a heart failure condition is worsening in response to the computed time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device for monitoring a heart failure patient, the device comprising:
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a tissue oxygenation sensor sensing a first signal responsive to oxygen availability in an extravascular volume of skeletal muscle tissue in the patient; a processor receiving the first signal and configured to compute a tissue oxygenation measurement using the first signal, detect a change in the tissue oxygenation measurement compute a time interval corresponding to the detected change in muscle tissue oxygenation; and
detect if a heart failure condition is worsening in response to the computed time interval. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification