Patent ID: 8706219

Claim:
An implanted device for a heart of a patient comprising: a housing; a first electrode and a second electrode configured to be disposed in the right ventricular septum (RV) of the heart; a lead having a third and fourth electrode that is configured to extend from the housing into the coronary sinus extending onto the lateral epicardial coronary vein of the heart; a drive circuit disposed in the housing to cause the electrodes to generate emitted electrical signals; a transmitter disposed in the housing that transmit received signals from the electrodes after the emitted signals have passed through the heart; a detector that generates a detector signal based on electrical signals derived from tissue and fluid in the heart; and a signal processor in communication with the detector which subtracts in real time a tissue component from the detector signal and produces a fluid volume signal to determine stroke volume of the heart using admittance as a function of electricity path through the tissue.