American Journal of Roentgenology, Vol 172, 1049-1053, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

Pneumothoraces and chest tube placement after CT-guided transthoracic lung biopsy using a coaxial technique: incidence and risk factors

F Laurent, P Michel, V Latrabe, M Tunon de Lara and R Marthan
Service d'Imagerie Medicale-Radiologie Diagnostique et Therapeutique, CHU Bordeaux, France.

OBJECTIVE: This study investigates factors influencing the risk of pneumothorax and chest tube placement in patients undergoing CT-guided transthoracic lung biopsy for pulmonary lesions using a coaxial technique. SUBJECTS AND METHODS: The study included 307 patients with pulmonary lesions biopsied under CT guidance. Patient-related parameters considered were age, sex, presence of emphysema or bullae, and lung function data. Lesion-related variables were size, location, cavitary appearance on CT, pleural contact, and depth of the lesion. Procedure variables were duration, type of needle, and experience of the operator. All variables were analyzed as single and multiple dependent variables for occurrence of pneumothorax. RESULTS: Pneumothorax occurred in 61 (19.9%) of the 307 patients, and chest tube placement was required in six patients (2.0%). Univariate analysis showed that lesion size, lesion location, lesion depth, and difficulty of the procedure were significantly associated with a higher rate of pneumothorax. Using multivariate logistic regression analysis, we found that lesion depth from the pleural entry point was the sole variable that was significantly associated with an increased risk of pneumothorax. This risk increased with the depth of the lesion. Chest tube placement was required more frequently in patients with severe emphysema, obstructive lung disease, or hyperinflation. CONCLUSION: Lesion depth is the predominant risk factor for pneumothorax in patients undergoing CT-guided transthoracic lung biopsy. Chest tube placement is necessary more frequently in patients with severe emphysema, obstructive lung disease, or hyperinflation.
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