Method for determining and monitoring a cardiac status of a patient

A method for determining a cardiac status of a patient in an implantable medical device being connectable to at least one medical lead for contact with tissue of a heart of the patient, the method comprising:

• sensing signals related to mechanical activity of the heart and producing an output signal related to the mechanical activity;
• sensing an activity level of the patient;
• identifying predetermined cardiac events in the cardiac signals and determining a systolic time interval and a diastolic time interval of a cardiac cycle using the identified cardiac events;
• calculating a percentage of left ventricular diastolic time (PLVDT) for a cardiac cycle corresponding to a relation between a diastolic time interval and a cardiac cycle time interval using the determined systolic and diastolic time intervals or a percentage of left ventricular systolic time (PLVST) for a cardiac cycle corresponding to a relation between a systolic interval time interval and a cardiac cycle time interval using the determined systolic and diastolic time intervals;
• calculating a rate of change of the PLVDT (or PLVST) and the activity level;
• synchronizing the activity level with the calculated PLVDT (or PLVST) over time;
• and
• determining a cardiac status based on the calculated PLVDT (or PLVST) and on the activity level and on a rate of change of the PLVDT (or PLVST) and on a rate of change of the activity level.