Relationship between outflow obstruction and left ventricular functional impairment in hypertrophic cardiomyopathy: a Doppler echocardiographic study - Araujo, Aloir Q.; Arteaga, Edmundo; Ianni, Barbara Maria; Fernandes, Fabio; Ramires, Felix J. A.; Buck, Paula C.; Salemi, Vera M. C.; Nastari, Luciano; Mady, Charles (Echocardiography, 2006)