Techniques are described for overdrive pacing the heart using a pacemaker wherein the overdrive pacing rate only increases when at least two intrinsic beats are detected within a determined search period. In one specific technique, an increase in the pacing rate occurs only if two P-waves are detected...http://www.google.co.uk/patents/US6804556?utm_source=gb-gplus-sharePatent US6804556 - Methods and apparatus for overdrive pacing heat tissue using an implantable cardiac stimulation device
