A Hybrid Signal Processing of RR Intervals from QTc Variation Searching Arrhythmia and Improving Heart Rate Variability Assessment in Acute Large Artery Ischemic Stroke

Table 2

HRV comparison of LQTc-AF group using Kalman filter and Labchart.

	LQTc-AF Kalman	LQTc-AF Labchart
Mean HR	100.30 ± 27.99	85.97 ± 16.74	NS
Mean RRI	669.3 ± 134.0	751 ± 139.3	NS
SDNN	114.3 ± 68.1	148.7 ± 126.3	NS
RMSSD	93.4 ± 48.3	191.9 ± 154.3
pNN50	44.36 ± 26.55	56.64 ± 34.96	NS
VLF (0–0.04 Hz)	3001 ± 4729	8852 ± 27625	NS
LF (0.04–0.15 Hz)	6404 ± 9715	4567 ± 3878	NS
HF (0.15–0.4 Hz)	3893 ± 4022	8549 ± 7725
LF/HF ratio	1.459 ± 0.618	0.685 ± 0.412	NS
SD1	66.23 ± 34.23	136.2 ± 109.5
SD2	146.9 ± 91.7	159 ± 144.2	NS
SD2/SD1	2.249 ± 0.645	1.470 ± 0.704
SamEn	1.413 ± 0.655	1.654 ± 0.474	NS
α1	1.0822 ± 0.1691	0.7714 ± 0.2563
α2	0.8050 ± 0.234	0.6466 ± 0.2871	NS