Qom University of Medical Sciences Journal

Background and Objectives: Injection is one of the most painful and common medical interventions that more than 12 billion of it are administered annually throughout the world. In spite of the wide use of this intervention, its associated pain remains as one of the unsolved health problems. So, this study was performed in order to determine the effect of multiple blunt pins pressure on the pain of intramuscular injection site.   Methods: This study was conducted as a single-blind randomized clinical trial at the injection section of kamkar-Arabnia Hospital in Qom, 2011-12. In this Study, 50 women aged from 16 to 60 years who had intramuscular injection of penicillin 6.3.3 were randomly assigned to two equal groups. The first group received intramuscular injection using a plastic device (an oval disc that supports multiple blunt pins) and in the second group (control), routine injection was performed. Pain was measured using a visual analogue scale. Data were analyzed by chi-square, Fisher’s exact, independent t, kolmogorov-Smirnov, and Levene tests.   Results: The mean pain intensities in experimental and control groups were 27.04±8.6 and 36.6±14.1, respectively. After intramuscular injection, the pain intensity significantly decreased in the experimental group compared to control group (p<0.006). There was no significant statistical difference between the two groups in age and BMI.   Conclusion: The results of this study showed that pressure on the skin with multiple blunt pins is highly effective in reducing the pain of intramuscular injection.