Heart rate variability is depressed in the early transitional period for newborns with complex congenital heart disease

摘要

Sample detrended fluctuation analysis (DFA) plot for an infant with CHD and a control infant. Shown are DFA4 fluctuation functions obtained for 10 min of RRi of an infant in the control group and of an infant in the CHD group. The fluctuation functions are plotted as a function of the scale in a log–log representation. ‘DFA4’ indicates that a fourth-order polynomial was used in the detrending process (refer to text for details). The short-term exponent ( ) was calculated from the scale region shown in the . The long-term exponent ( ) was calculated from the scale region shown in the