Meta-analysis of the association between emphysematous change on thoracic computerised tomography scan and recurrent pneumothorax.

OBJECTIVES At least a third of patients go on to suffer a recurrence following a first spontaneous pneumothorax. Surgical intervention reduces the risk of recurrence and has been advocated as a primary treatment for pneumothorax. But surgery exposes patients to the risks of anaesthesia and in some cases can cause chronic pain. Risk stratification of patients to identify those most at risk of recurrence would help direct the most appropriate patients to early intervention. Many studies have addressed the role of thoracic computerised tomography (CT) in identifying those individuals at increased risk of recurrence, but a consensus is lacking. Our objective was to clarify whether CT provides valuable prognostic information for recurrent pneumothorax. METHODS We conducted an exhaustive search of the literature for thoracic CT imaging and pneumothorax, and then performed a meta-analysis using a random effects model to estimate the common odds ratio and standard error. RESULTS : Here we show by meta-analysis of data from 2475 individuals that emphysematous change on CT scan is associated with a significant increased odds ratio for recurrent pneumothorax ipsilateral to the radiological abnormality (OR 2.49, 95% CI 1.51 to 4.13). CONCLUSIONS : The association holds true for primary spontaneous pneumothorax when considering emphysematous changes including blebs and bullae. Features such as bullae at the azygoesophageal recess or increased Goddard score similarly predicted recurrent secondary pneumothorax, as shown by subgroup analysis. Our meta-analysis suggests that CT scanning has value in risk stratifying patients considering surgery for pneumothorax.