An implantable cardiac device is used to measure one or more parameters relating to cardiac activity of a patient's heart, from which diastolic heart failure (“DHF”) may be monitored and/or detected. These parameters are used to calculate ventricular isovolumetric relaxation time or a related time...http://www.google.com.au/patents/US7526338?utm_source=gb-gplus-sharePatent US7526338 - Implantable cardiac device for monitoring diastolic heart failure and method of operation and use thereof
