Follow-up and assessments Patients will be assessed each morning by the pain team. The daily average pain score at rest and during cough will be recorded in numerical rating scale (NRS). Average daily pain intensity (0=none, 1=mild, 2=moderate, 3=severe) and average daily relief (4=complete relief, 3=a lot, 2=moderate, 1=slight, 0=no, -1=worse pain) will be assessed. The tries/good ratio shown on PCA machine and the total amount of morphine used, daily rescue pain drug consumption will be charted. The adverse effects (nausea, vomiting, pruritus, dizziness, and others) will be recorded with their frequencies and severity graded. Sedation will be assessed based on the scale shown.