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Table 4 Data of late potentials and heart rate variability

From: Multidisciplinary assessment of tako tsubo cardiomyopathy: a prospective case study

Late potentials Initial findings 3 months P
fQRS, ms 104 (96-108) 103 (99-113) 0.01
RMS 40, mV 31 (16-38) 30 (10-34) 0.13
LAS 40, ms 31 (27-40) 35 (30-46) 0.06
Heart rate variability Initial findings 3 months P
Total, ms² 1300 (764-2241) 1881 (1276-2065) 0.24
VLF, ms² 929 (563-1463) 948 (875-1352) 0.34
LF, ms² 207 (154-469) 315 (186-558) 0.17
HF, ms² 155 (60-216) 132 (109-519) 0.59
SDNN, ms 91 (75-126) 114 (105-146) 0.008
SDANN, ms 78 (63-111) 103 (89-138) 0.008
RMSSD, ms 28 (21-35) 24 (22-41) 0.59
SDNN index, ms 41 (31-51) 47 (40-49) 0.17
SDSD, ms 28 (21-35) 24 (22-41) 0.59
NN50 count 4157 (967-5085) 2913 (1448-12500) 0.41
pNN50, % 3.96 (2.38-6.39) 3.02 (1.66-14.47) 0.50
TINN, ms 390 (290-600) 480 (400-610) 0.06
  1. Values are median (interquartile range) or number (percentage). Abbreviations are: fQRS = duration of filtered QRS complex. RMS 40 = Root mean square voltage of signal in last 40 ms of QRS. LAS 40 = Low amplitude signal under 40 μv. VLF = very low frequency, LF = low frequency, HF = high frequency. SDNN = standard deviation of the normal-to-normal interval. SDANN = standard deviation of sequential 5-min heart period mean values. RMSSD = mean squared differences of successive normal-to-normal intervals. SDNN index = mean of standard deviations of normal RR intervals for all 5-minute segments. SDSD = standard deviation of successive differences. NN50 count = the number of interval differences of successive normal-to-normal intervals greater than 50 ms. pNN50 = percentage of adjacent normal-to-normal interval differences > 50 ms. TINN = triangular interpolation of RR intervals.