Figure 3From: Determination of the efficacy and side-effect profile of lower doses of intrathecal morphine in patients undergoing total knee arthroplasty Incidence of side-effects, including arterial desaturation below 90%, urinary retention, postoperative nausea and vomiting (PONV) and pruritus in each group over the first 24 postoperative hours (P > 0.05, Chi Square, for all comparisons). Back to article page