Techniques are described for estimating a rate of blood flow from a heart, such as a stroke volume or a cardiac output, as a function of a pressure in the heart. A pressure monitor may measure pressure values, and identify the times at which pressure values and valve opening and closing occur. The pressure...http://www.google.com.au/patents/US20030199779?utm_source=gb-gplus-sharePatent US20030199779 - Estimation of stroke volume cardiac output using an intracardiac pressure sensor