Changes in heart rate variability are correlated to hemodynamic improvement with chronic CARVEDILOL therapy in heart failure.
Bullinga JR, Alharethi R, Schram MS, Bristow MR, Gilbert EM. Changes in heart rate variability are correlated to hemodynamic improvement with chronic CARVEDILOL therapy in heart failure. J Card Fail. 2005 Dec; 11(9):693-9.