Implantable medical device with impedance measuring circuit

摘要

The present invention relates to a method for detecting a change of a condition of a patient using an implantable medical device (10; 20; 20') being connectable to the patient in at least one electrode configuration. The method comprises the steps of: initiating (54) at least one impedance measurement session to obtain at least one impedance value corresponding to an impedance of whole blood of the patient, calculating (60) at least one relative or absolute value of an amount of hematocrit in the blood of the patient using the at least one impedance value; and determining (62, 64) a present hematocrit level by means of the at least one hematocrit value, wherein a change of the condition can be derived from the present hematocrit level of the patient. Furthermore, the invention relates to an implantable medical device (10; 20; 20') and a computer readable medium comprising instructions for bringing a computer to perform the method.