System and method for detecting heart failure and pulmonary edema based on ventricular end-diastolic pressure using an implantable medical device
First Claim
1. A method for detecting ventricular end diastolic pressure (EDP) within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the method comprising:
- detecting a peak amplitude within an electrical cardiac signal sensed during a heartbeat using the lead;
detecting a value representative of ventricular EDP for the heartbeat using the pressure sensor by triggering the measurement of left ventricular pressure in response to the detection of the peak amplitude within the electrical cardiac signal;
tracking respiration cycles;
tracking heart beats;
averaging ventricular EDP over heart beats during one respiration cycle;
identifying changes in averaged ventricular EDP due to respiration; and
detecting changes, if any, in averaged ventricular EDP not due to respiration.
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Abstract
Techniques are provided for detecting left ventricular end diastolic pressure (LV EDP) using a pressure sensor implanted within the heart of a patient and for detecting and evaluating heart failure and pulmonary edema based on LV EDP. Briefly, the peak of the R-wave of an intracardiac electrogram (IEGM) is used to trigger the measurement of a pressure value within the left ventricle. This pressure value is deemed to be representative of LV EDP. In this manner, LV EDP is easily detected merely by measuring pressure at one point within the heartbeat—thereby eliminating any need to track ventricular pressure throughout the heartbeat. Techniques for detecting and evaluating heart failure and pulmonary edema based on the R-wave triggered LV EDP measurements are also set forth herein.
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Citations
19 Claims
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1. A method for detecting ventricular end diastolic pressure (EDP) within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the method comprising:
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detecting a peak amplitude within an electrical cardiac signal sensed during a heartbeat using the lead; detecting a value representative of ventricular EDP for the heartbeat using the pressure sensor by triggering the measurement of left ventricular pressure in response to the detection of the peak amplitude within the electrical cardiac signal; tracking respiration cycles; tracking heart beats; averaging ventricular EDP over heart beats during one respiration cycle; identifying changes in averaged ventricular EDP due to respiration; and detecting changes, if any, in averaged ventricular EDP not due to respiration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detecting the onset of a medical condition within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the method comprising:
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detecting peak amplitudes within electrical cardiac signals sensed during each of a plurality of heartbeats using the lead; detecting a value representative of ventricular end diastolic pressure (EDP) for each of the heartbeats using the pressure sensor by triggering a measurement of left ventricular pressure in response to the detection of the peak amplitude of the electrical cardiac signal within the heartbeat; detecting the onset of selected medical conditions within the patient based on changes in ventricular EDP over time; averaging ventricular EDP over heart beats during one respiration cycle; identifying changes in averaged ventricular EDP due to respiration; and detecting changes, if any, in averaged ventricular EDP not due to respiration.
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18. A system for detecting ventricular end diastolic pressure (EDP) within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the system comprising:
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an R-wave detection unit operative to detect a peak amplitude within an electrical cardiac signal sensed during a heartbeat using the lead; an R-wave-triggered detection unit operative to detect a value representative of ventricular EDP for the heartbeat using the pressure sensor by triggering a measurement of left ventricular pressure in response to the detection of the peak amplitude of the electrical cardiac signal means for averaging ventricular EDP over heart beats during one respiration cycle; means for identifying changes in averaged ventricular EDP due to respiration; and means for detecting changes, if any, in averaged ventricular EDP not due to respiration.
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19. A system for detecting ventricular end diastolic pressure (EDP) within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the system comprising:
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means for detecting a peak amplitude within an electrical cardiac signal sensed during a heartbeat using the leads; means for detecting a value representative of ventricular EDP for the heartbeat using the pressure sensor by triggering a measurement of measuring left ventricular pressure in response to the detection of the peak amplitude of the electrical cardiac signal; means for averaging ventricular EDP over heart beats during one respiration cycle; means for identifying changes in averaged ventricular EDP due to respiration; and means for detecting changes, if any, in averaged ventricular EDP not due to respiration.
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Specification