Free air on plain film: Do we need a computed tomography too?

Management of Pneumoperitoneum: Role and Limits of Nonoperative Treatment

OBJECTIVES

The aim of this study was to compare morbidity and mortality between nonoperative and operative treatment of pneumoperitoneum.

BACKGROUND

Pneumoperitoneum is a potentially life-threatening condition that has been traditionally treated with surgical intervention. Adequately powered studies comparing treatment outcomes are lacking.

METHODS

Chart review and computer-assisted abstraction were used to identify patients with pneumoperitoneum at 5 hospitals from 2010 to 2015. Patients with recent abdominal procedures or contained perforation were excluded. Patients were grouped by treatment modality: comfort measures only (CMO), nonoperative treatment, or operative intervention. CMO included only symptom-palliation, whereas nonoperative therapy included all interventions (antibiotics, peritoneal drains, resuscitation) excluding surgery. Outcomes were mortality, discharge disposition, and 30-day complications. Covariates included demographics, comorbidities, and acuity at presentation.

RESULTS

Forty patients received CMO, 202 underwent nonoperative treatment, and 199 underwent operative intervention. CMO patients had 98% 30-day mortality. There was no difference in 30-day (P = 0.64) or 2-year mortality (P = 0.53) between patients treated nonoperatively and operatively. Compared with patients treated operatively, patients treated nonoperatively were more likely to have a colorectal source of pneumoperitoneum (37% vs 31%; P = 0.03). Using logistic regression, operative treatment was associated with increased dependence on enteral tube feeding or total parenteral nutrition [odds ratio (OR) 4.30, 95% confidence interval (CI), 1.99-9.29] and nonhome discharge (OR 3.61, 95% CI, 1.81-7.17). Among patients with clinical peritonitis, operative treatment was associated with reduced mortality (OR 0.17, 95% CI, 0.04-0.80).

CONCLUSIONS

Operative intervention is associated with reduced mortality in patients with pneumoperitoneum and peritonitis. In the absence of peritonitis, operative treatment is associated with increased morbidity and nonhome discharge.

Imaging Patients With Alimentary Tract Perforation: Literature Review

Alimentary tract perforation is a frequent emergency condition. Imaging plays an important role to make an accurate diagnosis, defining the presence, the level, and the cause of the perforation, essential information to enable the most correct therapeutic choice. Plain radiography is generally performed as the first choice. In case of a clinically suspected bowel perforation, not detected on x-ray imaging, the contribution of computed tomography is essential. Magnetic resonance is not yet widely used in diagnostic workup of patients with acute abdominal pain, but it can be useful in the differential diagnosis of acute abdomen in specific patients (pregnancy and pediatric patients).