A patient's response to therapy such as CRT is assessed by cross correlation of a patient's evoked response and physical activity surrogates. Based on the cross correlation, a determination may be made as to whether or how much the therapy is helping the patient's physical activity. For example, the...http://www.google.ca/patents/US7894901?utm_source=gb-gplus-sharePatent US7894901 - Apparatus and method for assessing cardiac therapy
