Risk factors and clinical outcomes for spontaneous rupture of pyogenic liver abscess

Objective To evaluate the risk factors and clinical outcomes in patients with spontaneous rupture of pyogenic liver abscess (PLA). Methods A total of 602 patients diagnosed with PLA between January 2004 and July 2013 were retrospectively analyzed. Among them, 23 patients experienced a spontaneous rupture of liver abscess (SRLA). Results The prevalence of SRLA was 3.8%. Using multivariate analysis, liver cirrhosis (OR 4.651, P = 0.009), gas-forming abscesses (OR 3.649, P = 0.026), abscess ≥6 cm in diameter (OR 10.989, P = 0.002) and other septic metastases (OR 1.710, P = 0.047) were risk factors for SRLA. Regarding the site of rupture, 20 (87.0%) patients had a localized rupture, specifically, subphrenic abscess in 3 (13.0%), peri-hepatic abscess in 10 (43.5%), localized peritoneal abscess in 3 (13.0%) and empyema in 4 (17.5%); and the other 3 (13%) had peritonitis. Ruptures resulting in peritonitis require urgent surgery, whereas localized ruptures were managed with surgical or percutaneous drainage in addition to appropriate antibiotics. The in-hospital mortality rate of SRLA was 4.3%. Conclusion Patients with cirrhosis, having abscess ≥6 cm in diameter, gas-forming abscesses and other septic metastases in those with PLA should be monitored closely and may need early intervention for SRLA.