JMA Journal

Figure 1. Correlations between peritoneal CT attenuation values and clinical parameters.
The time after the onset of abdominal pain showed a significant negative correlation with peritoneal CT attenuation values (a), whereas the hospital stay showed no correlation with peritoneal CT attenuation values (b). There was a significant negative correlation between peritoneal CT attenuation values and serum CRP levels (c), whereas no correlation was observed between white blood cell counts (d). A statistically significant negative correlation was observed between the peritoneal CT attenuation value, serum creatinine level (e), and BUN (f), and a positive correlation was observed with platelet count (g); however, no correlation was observed with bilirubin levels (h). There were significant negative correlations between peritoneal CT levels and the SOFA (i) and APACHE II (j) scores.
APACHE II: Acute Physiology and Chronic Health Evaluation II; CRP: C-reactive protein; CT: computed tomography; SOFA: sequential organ failure assessment.

Figure 2. Receiver operating characteristic curves were used to discriminate between hospital survivors and nonsurvivors.
APACHE II: Acute Physiology and Chronic Health Evaluation II; AUC: area under the receiver operating characteristics curve; CT: computed tomography; SIRS: systemic inflammatory response syndrome; SOFA: sequential organ failure assessment.

Figure 3. Representative abdominal plain CT images (upper panels) and peritoneal CT attenuation values (lower panels) in a patient with two duodenal perforations.
The region of interest was created, and three arbitrary points on the peritoneum adjacent to free air were measured. Peritoneal CT levels (HU) were inserted.
CT: computed tomography; HU: Hounsfield units.

Figure 4. Peritoneal CT attenuation values in patients receiving conservative therapy for upper gastrointestinal perforations.
CT: computed tomography; HU: Hounsfield units.