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Background Acute pancreatitis (AP) is a common surgical presentation with a wide spectrum of severity and outcome. The most common cause of AP is gallstones, accounting for approximately 50% of cases, followed by alcohol excess. Reliable identification of gallstones is crucial as patients can be offered cholecystectomy to prevent recurrence. Current UK guidelines recommend a minimum of two negative ultrasounds to rule out gallstones. The aim of this study was to assess the pickup rate of gallstones on ultrasound for patients admitted with AP and audit our compliance with UK guidelines. Methods All patients admitted with acute pancreatitis between the start of January 2019 to the end of December 2020 were retrospectively analysed. All patients with a known pre-existing cause for pancreatitis such as alcohol excess, chronic pancreatitis, CBD stricture and pancreatic mass were excluded. Electronic records were examined to identify subsequent imaging investigations and final diagnosis. Particular interest was given to whether gallstones were identified, and adherence to UK guidelines. Results 206 patients were identified following the exclusion criteria. 189 underwent an ultrasound on admission, 111 were positive for gallstones. Of the negative ultrasounds (78), 15 underwent a further USS (4 positive), 29 underwent an MRCP (12 positive), 15 had a CT (3 positive) and 3 had an ERCP (3 positive). This left 16 with an unknown aetiology after 1 ultrasound and did not undergo further imaging and therefore did not comply with the current guidelines. Of the 11 patients who had 2 negative ultrasounds 5 had further imaging and all were negative for gallstones. Conclusions In conclusion Gallstone pancreatitis is a common acute surgical presentation of which morbidity and mortality can be significant. Following our retrospective assessment, we deem secondary imaging in the form of USS or MRCP to be necessary in the investigation of acute pancreatitis due to the high pickup rate. Compliance with current guidelines aids diagnostics and ensures appropriate and timely management of this condition leading to improved patient care.

P-BN07 Identifying gallstones in acute pancreatitis. Are we undermanaging our patients?