System and Method for Estimating Cardiac Pressure Based on Cardiac Electrical Conduction Delays Using an Implantable Medical Device
First Claim
1. A method for controlling a therapy delivered to a patient using an implantable medical device, the method comprising:
- measuring an electrical conduction delay in the heart of the patient that is affected by cardiac pressure;
estimating cardiac pressure within the patient from the electrical conduction delay; and
controlling a therapy for the patient based on estimated cardiac pressure.
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Accused Products
Abstract
Techniques are provided for estimating left atrial pressure (LAP) or other cardiac performance parameters based on measured conduction delays. In particular, LAP is estimated based interventricular conduction delays. Predetermined conversion factors stored within the device are used to convert the various the conduction delays into LAP values or other appropriate cardiac performance parameters. The conversion factors may be, for example, slope and baseline values derived during an initial calibration procedure performed by an external system, such as an external programmer. In some examples, the slope and baseline values may be periodically re-calibrated by the implantable device itself. Techniques are also described for adaptively adjusting pacing parameters based on estimated LAP or other cardiac performance parameters. Still further, techniques are described for estimating conduction delays based on impedance or admittance values and for tracking heart failure therefrom.
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Citations
27 Claims
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1. A method for controlling a therapy delivered to a patient using an implantable medical device, the method comprising:
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measuring an electrical conduction delay in the heart of the patient that is affected by cardiac pressure; estimating cardiac pressure within the patient from the electrical conduction delay; and controlling a therapy for the patient based on estimated cardiac pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for controlling therapy delivered to a patient using an implantable medical device, the system comprising:
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an electrical conduction delay measurement unit operative to measure conduction delays within the heart of the patient that are affected by cardiac pressure; a cardiac pressure estimation unit operative to estimate cardiac pressure within the patient based on the electrical conduction delay; and a therapy controller operative to control therapy based on estimated cardiac pressure. - View Dependent Claims (17, 18, 19, 20)
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21. A method for detecting a heart failure condition within a patient using an implantable medical device, the method comprising:
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measuring an electrical conduction delay in the heart of the patient that is affected by cardiac pressure; estimating cardiac pressure within the patient from the electrical conduction delay; and detecting a heart failure condition based on estimated cardiac pressure. - View Dependent Claims (22, 23)
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24. A method for estimating cardiac pressure within a patient using an implantable medical device, the method comprising:
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measuring an electrical conduction delay in the heart of the patient; estimating cardiac pressure within the patient from the electrical conduction delay; and transmitting estimated cardiac pressure values to an external device. - View Dependent Claims (25, 26, 27)
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Specification