Systems and methods for detecting cardiac conditions such as events indicative of worsening of
heart failure (HF) are described. A
system can receive a physiological
signal from a patient, transform one or more first portions of the physiological
signal into respective one or more baseline statistical values, transform one or more second portions of the physiological
signal into one or more historical extreme values, and generate one or more reference values of a physiologic parameter using the baseline statistical values and the historical extreme values. The
system can transform one or morethird signal portions of the physiological signal into respective one or more short-term values, and produce a cardiac condition indicator using a combination of relative differences between the short-term values and the corresponding reference values. The
system can output the cardiac condition indicator, or deliver therapy according to the cardiac condition indicator.