Patients who received intravenous PCA following surgery at the UHN for Pain relief

The numeric rating scale (NRS) is one way to assess how much pain a patient is feeling after surgery, ranging from 0 (no pain) to 10 (the worst pain imaginable). The score getting lower can thus indicate pain relief. However, a small change in the score does not mean that the patient is actually satisfied with their pain relief treatment. The PASS (patient acceptable symptom state) is the score threshold beyond which a patient considers their treatment satisfactory. The purpose of this observational study is to find out the PASS for the NRS in the first 48 hours after surgery. This will help guide future research on pain medicine, so that new techniques can deliver adequate patient satisfaction.