Routine follow-up imaging has limited advantage in the non-operative management of blunt splenic injury in adult patients.

Abstract

To date, limited evidence exists regarding follow-up imaging during the non-operative management (NOM) of blunt splenic injury (BSI), especially concerning ultrasound as first-line imaging modality. The aim of this study was to investigate the incidence and time to failure of NOM as well as to evaluate the relevance of follow-up imaging. All adult patients with BSI admitted to our level I trauma center, including two associated hospitals, between 01/01/2010 and 31/12/2017 were retrospectively analyzed. Demographic data, comorbidities, injury pattern, trauma mechanism, Injury Severity Score, splenic injury grade and free intra-abdominal fluid were reviewed. Additional analysis of indication, frequency, modality, results and consequences of follow-up imaging was performed. Risk factors for failure of NOM were evaluated using fisher's exact test. A total of 122 patients with a mean age of 43.8 ± 20.7 years (16-84 years) met inclusion criteria. Twenty patients (16.4%) underwent immediate intervention. One-hundred-and-two patients (83.6%) were treated by NOM. Failure of NOM occurred in 4 patients (3.9%). Failure was significantly associated with active bleeding (3 of 4 [75%] failures vs. 8 of 98 [8.2%] non-failures, OR 33.75, 95% CI 3.1, 363.2, p = 0.004), and liver cirrhosis (2 of 4 [50%] failures vs. 0 of 98 [0%] non-failures, OR 197, 95% CI 7.4, 5265.1, p = 0.001). Eighty patients (78.4%) in the NOM-Group received follow-up imaging by ultrasound (US, n = 51) or computed tomography (CT, n = 29). In 57 cases, routine imaging examinations were conducted (43 US and 14 CT scans) without prior clinical deterioration. Fifty-fife (96.4%) of these imaging results revealed no new significant findings. Every failure of NOM was detected following clinical deterioration in the first 48 h. To our knowledge this study includes the largest single centric patient cohort undergoing ultrasound as first-line follow-up imaging modality in the NOM setting of BSI in adult patients. The results indicate that a routine follow-up imaging, regardless of the modality, has limited therapeutic advantage. Indication for radiological follow-up should be based on clinical findings. If indicated, a CT scan should be used as preferred imaging modality.