A randomized, double blind, placebo controlled trial on effectiveness of preemptive analgesia with paracetamol on reduction of occurrence of headache after electro convulsive therapy

Abstract

INTRODUCTION: Electro convulsive therapy (ECT) is a safe and effective treatment for a wide range of psychiatric disorders. However, its utility is mainly limited by side effects and stigma. Post ECT headache is one of the commonest side effects of ECT. There is little evidence to suggest Pre-ECT analgesia would prevent the occurrence of post ECT headache. OBJECTIVES: Objective was to compare the incidence and severity of the post ECT headache of the patients who had paracetamol 1g, 2hrs before the induction of anaesthesia with those who had a placebo. METHOD: This was a double-blind, placebo controlled trial. Sixty two patients were given placebo and 73 received paracetamol tablets. Ethical approval was granted by an Ethics Review Committee, University of Kelaniya, and the trial was registered in the clinical trial registry (SLCTR/2015/27). Post ECT headache was measured 2 hours after the administration of ECT by a visual analogue test and verbal descriptive scale. Variables were tested for normality and Mann-Whitney U test was used to compare groups. Subsequent analysis was non-parametric, with Mann-Whitney U test. RESULTS: Both intervention and controlled groups had comparable baseline demographic and clinical variables. One third (34%) of the paracetamol group experienced post ECT headache, while 62% of the placebo group experienced same. There was a statistically significant reduction in the incidence and severity of post-ECT headache in the test group (p <0.05). This remained significant after confounding factors were adjusted for in the regression analysis for the duration of illness and headache during this episode. CONCLUSIONS: Preemptive analgesia with paracetamol, 2hours beforeECT, reduces post ECT headache and this could be routinely practiced to ameliorate ECT induced headache.