What is the most crucial first step a nurse should take when managing a patient's postoperative pain?

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E6 Nursing Fundamentals Potter Perry 12e Part 5 pp. 144-146, 157-159
E6 Nursing Fundamentals Potter Perry 12e Part 6 p. 184-186
Practise the full RAK Nursing Officer - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.