Impact of Short-Term Heart Rate Variability in Patients with STEMI Treated by Delayed versus Immediate Stent in Primary Percutaneous Coronary Intervention: A Prospective Cohort Study

Table 3

Heart rate variability after pPCI.

	IS group ()	DS group ()	value
Frequency-domain measures
VLF (ms^2)			0.788
LF (ms^2)			0.349
HF (ms^2)			0.011
5 min total power (ms^2)			0.939
LF/HF			0.163
Time-domain measures
SDNN (ms)			0.001
SDANN (ms)			0.003
ASDNN (ms)			0.079
RMSSD (ms)			0.007
pNN50 (%)			0.066

IS: immediate stenting; DS: delayed stenting; VLF: very low frequency; LF: low frequency; HF: high frequency; NN interval: normal to normal interval; SDNN: standard deviation of all NN intervals; SDANN: standard deviation of the averages of NN intervals; ASDNN: average standard deviation of the mean of every 5 min NN interval; RMSSD: square root of the mean of the sum of the squared differences between adjacent NN; NN50: number of pairs of adjacent NN intervals differing by >50 ms; pNN50: NN50 divided by the total number of all NN intervals.