Ohara T, Niebel CL, Stewart KC, Charonko JJ, Pu M, Vlachos PP, Little WC. Loss of adrenergic augmentation of diastolic intra-LV pressure difference in patients with diastolic dysfunction: evaluation by color M-mode echocardiography. JACC Cardiovasc Imaging. 2012 Sep; 5(9):861-70.