Changes in Heart Rate Variability of Depressed Patients after Electroconvulsive Therapy
Table 3
Depression and heart rate variability measures of study participants before ECT-1 and before ECT-6.
Parameter
before ECT-1 (mean ± SD)
before ECT-6 (mean ± SD)
Change (mean ± SD)
valuea
BDI Score
ECT responders
<0.0001
ECT nonresponders
Heart Rate (bpm)
ECT responders
0.21
ECT nonresponders
RMSDD (ms)
Responders
0.26
Nonresponders
LF (ms2)
ECT responders
0.88
ECT nonresponders
HF (ms2)
ECT responders
0.98
ECT nonresponders
LF/HF
ECT responders
0.21
ECT nonresponders
SD1
ECT responders
0.26
ECT nonresponders
SD2
ECT responders
0.88
ECT nonresponders
SD1/SD2
ECT responders
0.37
ECT nonresponders
a values are based on comparisons of the change between ECT-1 and ECT-6 in ECT responders and ECT nonresponders. ECT: electroconvulsive therapy; BDI: Beck Depression Inventory; RMSDD: root mean square of successive differences; LF: power in the low-frequency range (0.04–0.15 Hz); HF: power in the high-frequency range (0.15–0.4 Hz); SD1: standard deviation of the distances of points from the - axes.