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Microwave Ablation of the Lung in a Porcine Model: Vessel Diameter Predicts Pulmonary Artery Occlusion. Cardiovasc Intervent Radiol 2017 Oct;40(10):1609-1616

Date

05/13/2017

Pubmed ID

28497186

DOI

10.1007/s00270-017-1689-y

Scopus ID

2-s2.0-85018721755 (requires institutional sign-in at Scopus site)   5 Citations

Abstract

PURPOSE: To determine the size of pulmonary artery (PA) at risk for occlusion during percutaneous microwave ablation and to assess the effect of vessel diameter, number, and patency, on ablation zone volume.

MATERIALS AND METHODS: Computed tomography (CT) fluoroscopy-guided percutaneous microwave ablations were performed in 8 pigs under general anesthesia. All ablations were performed at 65 W for 5 min with a single 17-gauge antenna positioned in the central third of the lungs. A CT pulmonary angiogram was performed immediately after the ablations. The maximum diameter, number and patency of PA branches within each ablation zone were recorded. Ablation volumes were measured at gross dissection and with CT. Student's t test was used to compare ablation zone volumes among groups.

RESULTS: Twenty-one pulmonary ablations were performed. Six of the ablation zones (29%) contained at least 1 occluded PA branch. The mean diameter of the occluded PA branches in the ablation zones (2.4 mm; range, 2.0-2.8 mm) was significantly smaller than non-occluded PA branches (3.7 mm; range: 2.1-6.9 mm; p = 0.009). No PA branches ≥3 mm in size were occluded. There was no significant difference in volume of gross ablation zones that contained occluded versus non-occluded PAs (p = 0.42), one versus multiple PAs (p = 0.71), or PAs <3 mm versus ≥3 mm in diameter (p = 0.44).

CONCLUSIONS: PAs ≥3 mm in size have a low risk for iatrogenic occlusion during percutaneous microwave ablation. The presence of multiple adjacent PA branches, an occluded PA branch, and a vessel diameter ≥3 mm within the ablation zone had no observed effect on ablation zone volume.

Author List

Carberry GA, Nocerino E, Cristescu MM, Smolock AR, Lee FT Jr, Brace CL

Author

Mircea M. Cristescu MD, MBA Assistant Professor in the Radiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Ablation Techniques
Animals
Body Weights and Measures
Disease Models, Animal
Female
Fluoroscopy
Lung
Microwaves
Pulmonary Artery
Radiography, Interventional
Swine
Tomography, X-Ray Computed