System and method for estimating electrical conduction delays from immittance values measured using an implantable medical device

摘要

Techniques are provided for estimating electrical conduction delays with the heart of a patient based on measured immittance values. In one example, impedance or admittance values are measured within the heart of a patient by a pacemaker or other implantable medical device, then used by the device to estimate cardiac electrical conduction delays. A first set of predetermined conversion factors may be used to convert the measured immittance values into conduction delay values. In some examples, the device then uses the estimated conduction delay values to estimate LAP or other cardiac pressure values. A second set of predetermined conversion factors may be used to convert the estimated conduction delays into pressure values. Techniques are also described for adaptively adjusting pacing parameters based on estimated LAP.

主权项

1. A system for estimating cardiac pressure within a patient using an implantable medical device for implant within a patient, the system comprising:
an immittance detection system operative to detect a value representative of electrical immittance within the heart of the patient; an immittance-based electrical conduction delay estimation unit operative to estimate an electrical conduction delay in the heart of the patient from the value representative of immittance; and a conduction delay-based cardiac pressure estimation unit operative to estimate cardiac pressure within the patient from the estimated electrical conduction delay; a controller configured to at least one of, based at least in part on the estimated cardiac pressure: generate instructions for therapy to at least one end user, automatically deliver medication using a drug pump, or automatically adjust pacing parameters of the implantable medical device.