Natural history of a postpull pneumothorax or effusion: observation is safe.

BACKGROUND: Thoracostomy tube (TT) for drainage of hemopneumothorax is the most common intervention in thoracic trauma. Postpull pneumothorax or effusion (PPP/PPE) is common after removal of a TT. The natural history of PPP/PPE after discharge has not been described. This study evaluates the outcomes and management of PPP/PPE after discharge. METHODS: Trauma patients with TT placed from July 1, 2008, to June 30, 2013, were identified from an administrative database and trauma registry. PPP/PPE was defined as the presence of air or fluid in the chest on a postpull imaging. The electronic medical record and final radiology interpretation were reviewed to confirm PPP/PPE during index admission and at discharge. Clinical follow-up and imaging were reviewed for the presence of persistent PPP/PPE. Interventions directed toward PPP/PPE and readmissions were recorded for patients with and without a PPP/PPE. Multivariate logistic regression was performed to identify factors for chest-related readmission. RESULTS: Seven hundred ten patients surviving to discharge had a TT placed during the study time frame. Of the 151 patients (21.3%) with documented PPP/PPE on discharge, 115 patients had follow-up data available. Outpatient imaging was obtained in 35 patients, with persistent PPP/PPE noted in 16 patients (45.7%). Six patients (4%) with PPP/PPE at discharge required reintervention. Patients without documented PPP/PPE at discharge had a lower readmission rate (0.7% vs. 6.6%, p = 0.02). Multivariate logistic regression noted the presence of persistent PPP/PPE at follow-up (p = 0.001) to be associated with readmission. CONCLUSION: PPP/PPE is a common occurrence following removal of a TT. While patients discharged with PPP/PPE have a statistically higher reintervention rate, the absolute value remains low. This should be considered when treating clinically stable, asymptomatic PPP/PPE. LEVEL OF EVIDENCE: Epidemiologic study, level IV.