The present invention relates to the subjects (4) that a kind of position determination system determines the risk of heart failure. Measurement system (1) includes that photoplethysmogram provides the object of unit offer photoplethysmogram and the risk unit of heart failure, for determining that heart failure is based on provided photoplethysmogram risks. A kind of photoplethysmogramcan provide unobtrusive mode by using photoplethysmogram sensors turning out for work without doctor. Particularly, it is not necessarily required to measurement electrocardiogram, in order to carry out blood testing and execute the risk for determining heart failure for coronary angiography. The risk of heart failure, it is thus determined that can by technically it is relatively simple in a manner of turning out for work without doctor.
