A method and apparatus for maximizing stroke volume through atrioventricular pacing using an implanted cardioverter/pacer accomplishes AV pacing with an AV delay tailored to the particular patient, thereby maximizing accuracy and efficiency. The invention involves the measurement of successive impedance...http://www.google.ca/patents/US4303075?utm_source=gb-gplus-sharePatent US4303075 - Method and apparatus for maximizing stroke volume through atrioventricular pacing using implanted cardioverter/pacer