Cardiac autonomic function in patients with acute exacerbation of chronic obstructive pulmonary disease with and without ventricular tachycardia

Table 3 Comparison of DC, AC and HRV parameters between patients in the VT and non-VT groups

Variable	Non-VT group (n = 48)	VT group (n = 22)	P
DC (ms)	5.62 ± 1.75	4.13 ± 1.72	0.036
AC (ms)	-5.82 ± 1.84	-4.76 ± 1.69	0.040
SDNN (ms)	78.7 ± 22.1	68.2 ± 19.8	0.041
SDANN (ms)	68.7 ± 11.0	58.5 ± 10.5	0.043
rMSSD (ms)	21.3 ± 8.2	14.6 ± 6.2	0.045
LF (ms²)	1152.2 ± 440.5	1250.2 ± 408.6	0.068
HF (ms²)	221.5 ± 34.1	210.8 ± 27.6	0.071
LF/HF ratio	5.1 ± 2.0	5.9 ± 2.5	0.070

Data presented as the mean ± standard deviation
AC acceleration capacity of the heart rate, DC deceleration capacity of the heart rate, HF high-frequency power, LF low-frequency power, rMSSD the root mean square value of the standard deviations of the successive differences between adjacent normal RR intervals in the whole 24-h period, SDANN the standard deviation of the average normal RR intervals in all 5-min segments, SDNN the standard deviation of all normal RR intervals, VT ventricular tachycardia

ISSN: 1471-2466