Abstract：Objective To explore the correlation of heart rate variability (HRV) indices with cardiac troponin I (cTnI) and N-terminal pro-B-type natriuretic peptide (NT-proBNP) in children with Kawasaki disease (KD) and their prognostic value. Methods A total of 130 children with KD were assigned into coronary artery lesion (CAL) group (n=47) and non-coronary artery lesion (NCAL) group (n=83). Meanwhile, 110 healthy children and 29 children in the recovery stage of non-cardiovascular diseases were selected as control and non-KD groups, respectively. Patients in the four groups received 24-hour HRV monitoring. Levels of serum cTnI and NT-proBNP were measured in the KD and the non-KD group. Results Compared with the controls of the same sex and age, the KD patients had significantly reduced standard deviation of all normal sinus RR intervals (SDNN), mean of SDNN (SDNN index), percentage of successive normal sinus RR intervals >50 ms (pNN50), very low frequency (VLF), low frequency (LF), and high frequency (HF) but a significantly increased LF/HF ratio (P<0.05). The HRV indices including SDNN, standard deviation of all mean 5-minute RR intervals (SDANN), SDNN index, root mean squared successive difference, pNN50, VLF, LF, and HF in the CAL group all significantly decreased compared with those in the control and non-KD groups, while the LF/HF ratio was higher in the CAL group than in the control group (P<0.05). The serum levels of cTnI and NT-proBNP in the CAL and NCAL groups were significantly higher than those in the non-KD group (P<0.05). In children with KD, serum cTnI level was negatively correlated with SDNN and HF but positively correlated with the LF/HF ratio (P<0.05); serum NT-proBNP level was negatively correlated with SDNN, SDANN, and HF (P<0.05). Conclusions HRV indices have certain clinical significance in assessing CAL of children with KD.
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