Table 2.

Immediate effects of electrophysiological procedures on heart rate variability

	Number of Subjects	RR interval (ms)			LF (ms2)			HF (ms2)			LF/HF ratio
		Pre-ablation	Post-ablation	P value	Pre-ablalion	Post-ablation	P value	Pre-ablation	Post-ablation	P value	Pre-ablation	Post-ablation	P value
No isoprenaline given
PAF	15	877 ± 191	843 ± 220	NS	153 ± 251	50 ± 116	<0.001	86 ± 195	33 ± 83	<0.001	1.8 ± 2.3	15 ± 3.0	NS
Atrial flutter	15	802 ± 187	809 ± 145	NS	188 ± 450	86 ± 120	NS	96 ± 184	47 ± 100	NS	2.0 ± 2.4	1.8 ± 6.6	p < 0.05
AVNRT	5	841 ± 74	795 ± 103	NS	205 ± 108	257 ± 122	NS	71 ± 37	65 ± 39	NS	2.9 ± 1.3	4.0 ± 2.8	NS
AVRT	9	723 ± 121	719 ± 115	NS	272 ± 186	248 ± 205	NS	82 ± 65	102 ± 77	NS	3.3 ± 2.9	2.4 ± 2.7	NS
Negative EP study	5	827 ± 240	728 ± 193	NS	49 ± 39	76 ± 77	NS	38 ± 63	27 ± 32	NS	1.3 ± 4.7	2.8 ± 4.7	NS
Isoprenaline given
AVNRT	10	773 ± 171	604 ± 126	0.02	189 ± 147	106 ± 103	0.03	88 ± 47	30 ± 38	<0.01	2.2 ± 1.2	3.5 ± 5.6	NS
AVRT	6	840 ± 97	660 ± 75	<0.001	657 ± 567	344 ± 289	NS	250 ± 123	62 ± 47	0.03	2.6 ± 3.3	5.6 ± 6.4	<0.05
Negative EP Study	10	841 ± 202	700 ± 128	0.01	475 ± 377	204 ± 187	<0.05	258 ± 232	126 ± 184	<0.05	1.8 ± 1.5	1.6 ± 3.8	NS

NS indicates not significant