Patent ID: 8202224
Filing Date: 2012-06-19
Classification: A61B

Abstract:
1. A method for estimating cardiac pressure within a patient using an implantable medical device wherein the estimation exploits conversion factors representative of a correlation between a measured electrical parameter within the patient and the cardiac pressure of the patient, the method comprising: determining a set of conversion factors for converting measured electrical parameters to estimates of cardiac pressure, wherein the conversion factors are determined, at least in part, based on a physiological state of the patient and wherein the physiological state is either an acute state wherein an acute change of fluid volume within the intra-vascular fluid compartment of the patient does not substantially affect the fluid volume within the interstitial fluid compartment of the patient or a chronic state wherein fluid volume between the intra-vascular and interstitial fluid compartments of the patient has substantially equilibrated; and estimating cardiac pressure within the patient by applying a first set of conversion factors to measured electrical parameters when the patient is in the acute state and a second set of conversion factors to measured electrical parameters when the patient is in the chronic state.