The Efficacy of Patient Controlled Analgesia for Acute Non Traumatic Abdominal Pain in Emergency Department

Abstract

INTRODUCTION: Patient-Controlled Analgesia (PCA) is an intravenous selfadministration of small doses of opioids (such as morphine) using a programmable pump, The goal of PCA is to efficiently reduce patients’ pain at patient's preferred dose and schedule. Thus, we conducted a study to compare patient PCA morphine with intravenous bolus morphine for acute abdominal pain of non-traumatic origin in the emergency department (ED). MATERIALS AND METHODS: A randomised, non-blinded clinical trial was conducted in patients presented with severe acute non traumatic abdominal pain of less than 24 hours requiring opioid analgesic based on numerical pain score of more than seven at triage. The primary outcome was visual analogue pain score (VAS) recorded at 0, 30th, 60th and 120th minutes during the management in the ED and after admission to wards, and the secondary outcomes were total dosage of morphine used and degree of patient satisfaction. RESULTS: A total of 62 participants who fulfilled study criteria were randomized into PCA morphine group or bolus morphine group. The average amount of analgesic used for bolus morphine group was lower compared to PCA morphine (4.23 mg)(s.d 1.89 vs 5.29 mg)(s.d 2.16) (p=0.027). Despite of significant VAS score changes within group analysis, between group repeated measure ANOVA (RMA) VAS score analysis was not statistically significant. [Bolus group (6.7+2.03) compared to PCA group (5.83 + 2.38)](p=0.089). Patient satisfaction was statistically significant for the PCA group [PCA (1.65+0.709) compared to bolus group (2.23+0.920)](p=0.007). CONCLUSIONS: There was no significant difference in pain score reduction between PCA and intravenous bolus of morphine for the management of severe acute non traumatic abdominal pain in ED. However, PCA provided more patient satisfaction and should be considered as an alternative modality of acute pain management in ED.