Table 3:

Definite or questionable vs no histologic damage to carotid arteries under various conditions of catheter testing in vivo

Condition Tested	Definite/Questionable Damage (%)	No Damage (%)	Odds Ratio	95% CI	P Value^*
Arterial stasis (n = 24)	21	79	0.87	0.25–3.5	.77
Normal flow (n = 57)	23	77	0.87	0.25–3.5	.77
Current ≤300 mA (n = 51)	14	86	0.31	0.092–1.020	.034
Current > 300 mA (n = 36)	31	69	0.31	0.092–1.020	.034
Activations ≤1 minute (n = 52)	8	92	0.17	0.037–0.61	.003
Activations > 1 min (n = 42)	33	67	0.17	0.037–0.61	.003
Work ≤100 J (n = 68)	13	87	0.29	0.018–1	.037
Work > 100 J (n = 26)	35	65	0.29	0.018–1	.037
Saline drip ≤2 mL/min (n = 39)	21	79	1.2	0.35–3.7	.80
Saline drip >2 mL/min (n = 55)	18	82	1.2	0.35–3.7	.80
≤5°C catheter tip coil temperature rise (n = 36)	8	92	0.17	0.028–0.80	.013
> 5°C temperature rise (n = 29)	34	68	0.17	0.028–0.80	.013
MR and x-ray guidance (n = 45)	16	84	0.64	0.19–2.0	.44
X-ray guidance only (n = 49)	22	78	0.64	0.19–2.0	.44