Absolute intrathoracic impedance based scheme to stratify patients for risk of a heart failure event
First Claim
1. A method of operation of a medical system for determining whether a patient is at risk of exhibiting excessive fluid or dehydration, the method comprising:
- (a) acquiring from an implantable medical device memory a patient'"'"'s absolute intrathoracic impedance data over a time period;
(b) determining, through a processor, an average of the intrathoracic impedance data over the time period;
(c) defining, through the processor, a target impedance range bounded by a first range and a second range, the first range being a lower value intrathoracic electrical impedance and the second range being a higher value of intrathoracic electrical impedance;
(d) determining, through the processor, whether the average of the intrathoracic impedance data is outside one of the first and second ranges;
(e) in response to step d, the processor determines a level of heart failure (HF) event risk based upon whether the average of impedance is outside the targeted impedance range; and
(f) in response to step d, adjusting therapy delivered to a patient;
wherein the system comprises a cardiac pacemaker and wherein the therapy is adjusted by switching to one of fusion pacing, biventricular pacing, and multisite pacing and using the pacemaker to deliver the adjusted therapy.
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Abstract
A health care system acquires data determines whether a patient is at risk of hypervolemia or hypovolemia. The method comprises (a) acquiring from a device memory a patient'"'"'s absolute intrathoracic impedance data over a pre-specified time period, (b) determining a running average of the intrathoracic impedance data over the pre-specified time period, and (c) determining by the system whether the running average of the intrathoracic impedance data over the pre-specified time period exceeds one of a first and second range, the first range being a higher value boundary of intrathoracic electrical impedance and the second range being a lower value boundary of intrathoracic electrical impedance.
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Citations
13 Claims
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1. A method of operation of a medical system for determining whether a patient is at risk of exhibiting excessive fluid or dehydration, the method comprising:
- (a) acquiring from an implantable medical device memory a patient'"'"'s absolute intrathoracic impedance data over a time period;
(b) determining, through a processor, an average of the intrathoracic impedance data over the time period;
(c) defining, through the processor, a target impedance range bounded by a first range and a second range, the first range being a lower value intrathoracic electrical impedance and the second range being a higher value of intrathoracic electrical impedance;
(d) determining, through the processor, whether the average of the intrathoracic impedance data is outside one of the first and second ranges;
(e) in response to step d, the processor determines a level of heart failure (HF) event risk based upon whether the average of impedance is outside the targeted impedance range; and
(f) in response to step d, adjusting therapy delivered to a patient;
wherein the system comprises a cardiac pacemaker and wherein the therapy is adjusted by switching to one of fusion pacing, biventricular pacing, and multisite pacing and using the pacemaker to deliver the adjusted therapy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- (a) acquiring from an implantable medical device memory a patient'"'"'s absolute intrathoracic impedance data over a time period;
Specification