Journal of Medical Engineering / 2016 / Article / Tab 1

Research Article

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 1

HRV comparison of long QTc-AF and normal QTc-nonAF using Kalman filter for better RR interval.

LQTc-AF KalmanNQTc-nonAF Kalman

Mean HR100.30 ± 27.9973.98 ± 12.18
Mean RRI669.3 ± 134.0845.6 ± 154.5
SDNN114.3 ± 68.158.5 ± 41.3
RMSSD93.4 ± 48.334.43 ± 26.68NS
pNN5044.36 ± 26.558.10 ± 11.88NS
VLF (0–0.04 Hz)3001 ± 47291266 ± 1300NS
LF (0.04–0.15 Hz)6404 ± 97151203 ± 1733NS
HF (0.15–0.4 Hz)3893 ± 4022832 ± 1234
LF/HF ratio1.459 ± 0.6182.464 ± 2.501NS
SD166.23 ± 34.2324.45 ± 18.92NS
SD2146.9 ± 91.777.3 ± 54.8
SD2/SD12.249 ± 0.6453.620 ± 2.443
SamEn1.413 ± 0.6550.756 ± 0.460

NS: not significantly different. : significant difference. HR: heart rate (beat/min). RRI: RR interval (msec). SDNN (ms): standard deviation of all NN intervals. RMSSD (ms): square root of the mean squared difference between adjacent NN intervals. PNN50 (%): number of adjacent NN intervals that differ by 50 ms/total number of NN intervals. VLF (ms2, %): very low frequency range (<0.003 Hz). LF (ms2, %): low frequency range (0.04–0.15 Hz). HF (ms2, %): high frequency range (0.15–0.4 Hz). SD1: standard deviation of points perpendicular to the line of identity. SD2: standard deviation of points along to the line of identity. SamEn: sample entropy.

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