Patent ID: 7883469

Claim:
A device for detecting the state of a heart on the basis of intracardial impedance measurement comprising: at least two electrodes; an impedance measuring unit which is electrically connected to the at least two electrodes; wherein said impedance measuring unit is configured to deliver a delivered current or apply an applied voltage and detect a voltage or a current; wherein said impedance measuring unit is configured to ascertain an impedance based on a quantity of said delivered current or said applied voltage and a voltage drop caused by the current, or the current caused by the voltage and derive an impedance curve; an analysis unit, connected to said impedance measuring unit and configured to identify a diastole in said impedance curve as a period between maximum and minimum impedance, and to derive a maximum negative gradient of the impedance curve during said diastole; and, wherein said analysis unit is configured to determine a period of time between a beginning of an impedance reduction in said impedance ascertained by said impedance measuring unit and a following occurrence of the maximum negative gradient of said impedance curve derived by said impedance measuring unit as a cardiac function parameter through analysis of said impedance curve.