A pressure sensor is deployed in the right atrium and is in contact with the tissue of the fossa ovalis. The fossa ovalis acts as a membrane and the pressure sensor determines the relative and/or absolute pressure within the left atrium while remaining within the right atrium. A variety of embodiment...http://www.google.ca/patents/US20070021665?utm_source=gb-gplus-sharePatent US20070021665 - System and method of determining cardiac pressure
