| 摘要 |
An apparatus for determining variation over time of a medical parameter of a human being obtained from a sensed signal comprises a sensor (12, 14, 16, 18, 20) implantable in the human being for sensing the signal. A comparing means (8, 30) compares at least one characteristic property, derived from the sensed signal obtained for at least one predetermined first level of activity of the human being, with corresponding reference property of a sensed reference signal, obtained for a predetermined reference level of activity of the human being, for determining a relation between the characteristic property of the sensed signal and the reference property. Trend determining means (10, 30) determine trends in the medical parameter by analysing the relation between the characteristic property of the sensed signal obtained at different times and the reference property. A corresponding method is also disclosed, as well as an implant for heart failure diagnostics comprising an apparatus as described. A sensor (12, 14, 16, 18, 20) is then arranged to pick up dynamic mechanical information from the heart of the human being and generate a corresponding signal. A heart stimulator comprises such an implant and a control means (34) arranged to control stimulation of the heart depending on determined trends in the medical parameter. |
