AIM To evaluate the usefulness of ultrasound monitoring acute fluid accumulation in acute pancreatitis.METHODS Six hunclred and twenty-seven patients with acute pancreatitis were undergone ultrasonographicexamination. All examinations were performed by the attending doctors. The first scans were performed onthe first or second day after admission to our hospital, if there were acute fluid accumulation inperipancreatic spaces including the lesser sac, pararenalspaces, peritoneal cavity, or even thoracic cavity,then the follow-up scans were routinely performed 3 - 7 days following the initial scan and this interval wasdependent upon the severity of acute pancreatitis, and partieulanly noticed the changes of pancreas and thefluid mentioned above. Continuous variables were analyzed by t test, Discrete variables were analyzed by the,x2 test and rank sum test using SPSS, P<0.05 was considered significant.RESULTS Acute fluid accumulation was fouad in 57.5% of 627 patients among them 14.4% evolved intocomplications and 85.6% resolved spontaneously. The most frequent sites of fluid accumulation are theperitoneal cavity and the left hemithorax, followed by the lesser sac and right hemithorax (x2 = 738,P<0.0001); the hospital stay was longer as the quantity of acute fluid accumulation increased (P<0.0001, t = 2.2 - 4.2 ). There was no fluid accumulation in mild AP and more than 2 sites in severe AP (P<0.0001, x2 = 147.8).CONCLUSION The number of sites as well as the duration of fluid accumulation are proportional tohospital stay and the severity of AP.

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