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= Efficacy Safety Score (ESS) =

Introduction
The aim of modern management of postoperative pain is to enable functioning while relieving suffering; it is not enough to minimize side effects. Still, between 20% and 40% of surgical patients report high levels of postoperative pain, and almost 25% have experienced adverse effects of opioid analgesics [1]. Unsatisfying methods for evaluation of efficacy and side effects of analgesics, irregular recording of clinical information, and absence of a clearly defined “callout algorithm” for nurses might contribute to a postoperative pain treatment suffering from both side effects and even fatalities [1–5].