An implantable, multi-chamber cardiac stimulation device and method automatically adjust inter-chamber stimulation delays whenever stimulation rate is changed according to a patient's metabolic need. Inter-chamber stimulation delays include inter-atrial delays, inter-ventricular delays, and atrio-ventricular...http://www.google.co.uk/patents/US6937895?utm_source=gb-gplus-sharePatent US6937895 - Multi-site cardiac stimulation device for controlling inter-chamber stimulation delay
