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Table 4 PONV risk in relation to the level of prophylaxis

From: Risk of postoperative nausea and vomiting in hip and knee arthroplasty: a prospective cohort study after spinal anaesthesia including intrathecal morphine

Number of patients (%) with PONV All patients (n = 99) Suboptimal PONV prophylaxis (n = 27) Optimal PONV prophylaxis (n = 72) p-value
0 h–6 h 26 (26%) 9 (33%) 17 (24%) p = 0.44
6 h–Day 1 26 (26%) 12 (44%) 14 (19%) p < 0.05
Day 1–Day 2 20 (20%) 12 (44%) 8 (11%) p < 0.01
Day 2–Day 3 20 (20%) 8 (30%) 12 (17%) p = 0.17
0 h–Day 1 36 (36%) 15 (56%) 21 (29%) p < 0.05
0 h–Day 3 46 (46%) 19 (70%) 27 (38%) p < 0.01
  1. PONV postoperative nausea and vomiting; comparison between suboptimal and optimal prophylaxis with Pearson’s chi-squared test. Data collected with a standardized questionnaire answered at 2, 4 and 6 h after arrival at the recovery unit and at noon on postoperative days 1–3. Risk of PONV during different postoperative periods after hip or knee arthroplasty under spinal anaesthesia including intrathecal morphine. Day 1 = first day after surgery