Multidisciplinary assessment of tako tsubo cardiomyopathy: a prospective case study

Table 4 Data of late potentials and heart rate variability

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

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.

ISSN: 1471-2261