Serum amylase assessment four hours after ES is a reliable, cost-effective follow-up and minimizes the likelihood of underestimating the risk of post-procedure pancreatic reaction. It should be recommended particularly in out-patients and when pancreatic duct opacification has occurred.

Serum amylase assessment 4 h after ES minimizes the likelihood of underestimating the risk of postprocedure pancreatitis. It is therefore a reliable, cost-effective follow-up, particularly in outpatients.

Diagnostic and therapeutic ERCP and UDCA were effective in 92.5% of our cases, over a long follow-up, indicating that the term "idiopathic" was justified only in a few patients with acute recurrent pancreatitis.

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