Yoseph Rozenman et al, Detection of left ventricular systolic dysfunction using a newly developed, laptop based, impedance cardiography index.
A simple and cheap techniques that will reliably detect mild reduction of the EF, typical for ALVSD, will thus be of enormous value to reduce the occurrence of CHF and cardiac mortality
International Journal of Cardiology Volume 149, Issue 2: 248-250, 2 June 2011
http://www.internationaljournalofcardiology.com/article/S0167-5273%2811%2900190-2/abstract