Review of prescribing practices for intermittent bolus administration of morphine

Abstract

Background: Several changes to medication safety practices were proposed in a pediatric hospital, including changing the period of patient observation after administration of opioids and limiting the availability of various concentrations of morphine in the patient care unit. Objective: To document and review postoperative pain management for children on a surgical ward, specifically with regard to intermittent IV bolus administration of morphine, to help in assessing the impact of the proposed nursing practice changes. Methods: Data were collected from records for narcotics and controlled drugs for the surgical ward over a 3-month period (April to June 2006). For each patient, data had been recorded for up to 7 consecutive days after surgery. A patient's data were included in the review if he or she had received at least 2 doses of morphine by IV bolus, except for the review of weight-based dosing pattern (mg/kg), for which all patients who had received at least one dose of IV morphine were included. Results: Charts for 193 patients were audited. Of these, 163 patients (84.5%) had recieved up to 0.1 mg/kg per dose, and 53 (27.5%) had received only one dose of morphine. Among patients who received more than one dose, the median dose was 0.080 mg/kg on day 1, with a decrease by day 5 to 0.065 mg/kg. Most patients received morphine over the first 2 days after surgery. The median time elapsed between doses was 4.3 h on day 1 and 6.2 h on day 2. Of the 1020 doses included in the analysis, most (801 [78.5%]) were 4 mg or less. Conclusion: The intermittent administration of IV bolus doses of morphine at the study hospital followed common standards for the treatment of postoperative pain. Most doses were no more than 4 mg. On the basis of this information, only 2-mg vials of morphine are now stocked on the ward. The hospital's change in monitoring practices will increase the surveillance of patients receiving IV bolus doses of morphine. Copyright ©2011 Canadian Society of Hospital Pharmacists.