Brief Article
Copyright ©2010 Baishideng Publishing Group Co.
World J Gastroenterol. Sep 14, 2010; 16(34): 4291-4296
Published online Sep 14, 2010. doi: 10.3748/wjg.v16.i34.4291
Table 1 Characteristics of the study population
Parameters
Median (IQR) age (yr)54 (50-67)
Male patients, n (%)20 (80)
Contrast-enhanced CT, n (%)23 (92)
Median (IQR) No. of PPCs
Necrosis without pus2 (1-2)
Necrosis with pus1 (1-2)
Fluid without necrosis1 (1-3)
Infected PPC, n (%)12 (48)
OF in patients with PPC
Total, n (%)19 (76)
Persistent OF (> 48 h), n (%)15 (60)
Multiple OF, n (%)2 (8)
Mortality, n (%)3 (12)
Table 2 Computed tomography characteristics of peripancreatic collections
Necrosis without pus (n = 25)Necrosis with pus (n = 16)Fluid without necrosis (n = 4)P’ value
Volume in cm3, median (IQR)193.4 (50-1129)116.3 (88-389)551.7 (324-937)
Fluid characteristicsHeterogeneity, n (%)12 (48)15 (93.8)c1 (25)a0.0041
Fluid attenuation, n (%)21 (84)13 (81.3)4 (100)0.69
Wall characteristicsPerceptible, n (%)23 (92)14 (88)4 (100)0.76
Enhancing, n (%)21 (84)14 (88)4 (100)0.68
Irregular, n (%)18 (71)14 (88)1 (25)a0.05
Internal air, n (%)4 (16)9 (56)c0 (0)a0.0091
Vessel involvement, n (%)5 (20)3 (19)0 (0)0.62
Table 3 Predictive value of heterogeneity and presence of air within necrotic collection on computed tomography scan in diagnosing the presence of pus
HeterogeneityPresence of airBoth
Sensitivity (%)93.847.347.4
Specificity (%)52.084.092.0
Positive predictive value (%)55.569.281.8
Negative predictive value (%)92.967.723.3
Positive likelihood ratio   1.9 2.95.9
Negative likelihood ratio   0.1 0.60.6