. Author manuscript; available in PMC: 2011 Oct 1.

Published in final edited form as: Circ Arrhythm Electrophysiol. 2010 Oct;3:624–631. doi: 10.1161/CIRCEP.110.945295

Table 2.

Electrogram Characteristics of Scar Tissue in Patients Presenting with and without inducible VT

	Inducible VT (N=1672)	Non-Inducible (N=2460)	P value
Number of distinct points sampled	30 [28,42]	9 [6,19]	0.003
Number of distinct points sampled per 1 cm² infarct area	0.94 [0.79,1.22]	1.25 [1.12,1.64]	0.01
Unipolar EGM Voltage (mV)	3.2 [2.7,3.8]	6.1 [4.9,9.8]	<0.001
Bipolar EGM Voltage (mV)	0.46±0.28^†	0.58±0.25^†	<0.001
Area of bipolar voltage <1.0mV (cm²)	32 [27,57]	7.4 [4.8,15]	0.003
EGM width (msec)	107[100,120]	89[85,97]	0.007
Normal EGM (%)	0	0	NS
Abnormal EGM (%)	39.2	71.8	<0.001
Fractionated EGM (%)	47.4	26.9	<0.001
EGM with Isolated Potentials (%)	13.2	1.1	<0.001

^†

mean ± standard deviation. All other continuous data presented as median [25, 75 percentile].

Abbreviations: EGM= electrograms