Persistent pathways after lung radiofrequency ablation as a risk factor of drain placement

Figures & data

Figure 1. Visualization of a persistant aeric path after the RF needle withdrawal.

Figure 2. Intra-parenchyma pathway between the visceral pleura and the tumour, its length and thickness.

Table 1 Comparability of groups “without” and “with” RF pulmonary path visualisation.

	Pathway
	No	Yes	p
Sex
F
Number	11	14	0.8
%	33.3%	28.0%
M
Number	22	23
%	66.7%	62.0%
Surgical history
No
Number	20	15	0.15
%	60.7%	40.6%
Yes
Number	13	22
% n	39.3%	59.4%
Age
Average	68.5	64.4	0.49
SD	12.8	17.3
Distance between the pleura and the lesion (mm)
Average	24.9	30.3	0.04
SD	18.6	14.1
Lesion size (mm)
Average	17.2	13.6	0.02
SD	7.8	7.1
Emphysema
No
Number	11	16	0.46
%	33.0%	43.2%
Yes
Number	22	21
% n	66.7%	56.7%

Table 2. Multivariate analysis in the three analyses (the risk of pneumothorax on whole population, the risk of drainage on whole population, the risk of drainage in patients with pneumothorax) after adjustments on the risk factors.

	SD	Odd-ratio	Low confidence interval	High confidence interval	p value
Risk of drainage in patients with pneumothorax
Age	0.042	0.043	1.043	0.961	1.146
Previous surgery	−1.230	1.282	0.292	0.016	2.805
distance from lesion to pleura	1.794	1.281	6.012	0.565	103.977
Emphysema	−0.570	1.270	0.566	0.038	7.006
Gender M	0.816	1.145	2.262	0.255	26.891
Size of the lesion	−0.575	0.212	0.563	0.318	0.764
Pathway visualisation	3.419	1.302	30.536	3.398	691.882
Risk of drainage on whole population
Age	0.001	0.028	1.001	0.947	1.058
Previous surgery	−1.355	0.838	0.258	0.042	1.199
distance from lesion to pleura	1.765	0.896	5.843	1.090	39.150
Emphysema	0.330	0.801	1.391	0.291	7.199
Gender M	0.202	0.779	1.223	0.266	5.973
Size of the lesion	−0.308	0.092	0.735	0.594	0.857
Pathway visualisation	2.770	0.810	15.953	3.706	94.982
Risk of pneumothorax on whole population
Age	0.023	0.996	0.951	1.040	0.86214
Previous surgery	0.690	0.265	0.062	0.963	0.04351
distance from lesion to pleura	0.893	4.395	0.895	34.125	0.06980
Emphysema	0.627	1.253	0.361	4.335	0.71895
Gender M	0.642	0.982	0.272	3.483	0.97715
Size of the lesion	0.045	0.991	0.909	1.086	0.83209
Pathway visualisation	0.687	6.936	1.943	29.852	0.00232