. Author manuscript; available in PMC: 2015 Feb 16.

Published in final edited form as: Circ Arrhythm Electrophysiol. 2014 Feb 14;7(2):244–250. doi: 10.1161/CIRCEP.113.000548

Table 2.

Comparison of Procedural Variables Between Patients With Different Percutaneous Left Ventricular Assist Devices During Ventricular Tachycardia Ablation

	IABP (N=22)	Non-IABP Combined (N=44)	Non-IABP Subgroups		Total (N=66)	P Value (IABP vs Non-IABP)

			Impella (N=25)	TandemHeart (N=19)
No. of VTs induced
Mean±SD	3.3±1.5	3.1±1.9	2.5±1.7	3.9±1.8	3.2±1.8	0.733
Median (min–max)	3 (1–7)	3 (0–7)	2 (0–7)	4 (2–7)	3 (0–7)	0.556
No. of nonclinical VTs induced
Mean±SD	1.2±1.1	1.0±1.5	0.64±1.1	1.7±1.9	1.1±1.4	0.721
Median (min–max)	1 (0–4)	0.5 (0–6)	0 (0–5)	1 (0–6)	1 (0–6)	0.209
No. of VTs ablated
Mean±SD	1.8±1.0	2.4±1.3	1.9±1.1	3.0±1.2	2.2±1.2	0.074
Median (min–max)	1 (1–4)	2 (1–6)	1 (1–5)	3 (1–6)	2 (1–6)	0.084
No. of unstable VTs mapped and ablated
Mean±SD	0.32±0.48^*	1.05±0.78^*	1.12±0.83	0.95±0.70	0.80±0.77^*	<0.001^*
Median (min–max)	0 (0–1)^*	1 (0–3)^*	1 (0–3)	1 (0–2)	1 (0–3)^*	<0.001^*
No. of VTs RF terminated
Mean±SD	0.91±0.81^*	1.59±1.00^*	1.16±0.85	2.16±0.90	1.36±0.99^*	0.007^*
Median (min–max)	1 (0–4)^*	1 (0–4)^*	1(0–3)	2 (1–4)	1 (0–4)^*	0.003^*
Entrainment/activation mapping, %	13 (59)^*	36 (82)^*	20 (80)	16 (84)	49 (74)^*	0.046^*
External rescue shocks
Mean±SD	3.0±1.5^*	1.9±2.2^*	1.6±2.8	2.3±1.2	2.3±2.0^*	0.049^*
Median (min–max)	3 (0–6)^*	2 (0–13)^*	1 (0–13)	2 (1–5)	2 (0–13)^*	0.003^*
Fluoro time, min, median (Q1–Q3)	63 (52–72)	63 (53–73)	68 (54–74)	58 (48–70)	63 (53–73)	0.935
RF time, min, median (Q1–Q3)	36 (27–45)	31 (18–41)	36 (13–50)	28 (19–37)	34 (23–43)	0.142
Procedure time, min, median (Q1–Q3)	302 (242–345)	339 (260–417)	291 (247–346)	379 (328–433)	327 (253–410)	0.185
Ventilation time, h, median (Q1–Q3)	16 (12–25)	12 (6–24)	6 (5–29)	20 (12–24)	15 (8–24)	0.121

IABP indicates intra-aortic balloon pump; RF: Radiofrequency; and VT, ventricular tachycardia.

Statistically significant.