Patent ID: 8628471

Claim:
An implantable device comprising: an accelerometer to sense body motion data represented as an accelerometer data pattern and; an impedance sensor to sense transthoracic impedance data; a cardio-activity sensor to sense cardiac data; an analysis component; and a communications component communicatively coupled to the accelerometer, the impedance sensor, and the cardio-activity sensor, the communications component configured to communicate the body motion data, the transthoracic impedance data, and cardiac data to the analysis component, the analysis component configured to: obtain a transthoracic impedance variation pattern from the transthoracic impedance data; identify a possible illness from the transthoracic impedance variation pattern, with the possible illnesses including an onset of asthma and a progression of heart failure; obtain an inhalation/exhalation time ratio measured by the transthoracic impedance data; and determine whether the possible illness is likely a progression of heart failure by removing the possibility of the possible illness being asthma based on the inhalation/exhalation time ratio and the accelerometer data pattern.