Background: Aspiration during intramuscular (IM) injection is a traditional technique intended to prevent intravascular administration. However, its routine use has been increasingly debated due to potential discomfort and lack of evidence supporting clinical benefit.
Aim: To systematically evaluate the effect of aspiration on pain intensity, procedure duration, and complications in IM injections through a meta-analysis of randomized controlled trials.
Methods: A comprehensive literature search was conducted in PubMed, Cochrane Library, Embase, Web of Science, Scopus, EBSCOhost, TR Dizin, and PsycINFO up to May 2, 2025. Eligible studies compared aspiration versus no-aspiration techniques in IM injections. Data were analyzed using RevMan 5.4.1, with standardized mean differences (SMD) and mean differences (MD) calculated using random-effects models. Subgroup analyses were performed by age group and injection site. Risk of bias was assessed using the Cochrane ROB-2 tool.
Results: Six studies involving 693 participants were included. Aspiration significantly increased pain scores (SMD = 0.83; 95% CI: 0.31-1.35; p = 0.002), particularly in pediatric populations (SMD = 1.29; 95% CI: 1.12-1.46) and in deltoid injections. It also prolonged injection time by an average of 4.53 s (MD = 4.53; 95% CI: 3.87-5.20). No serious complications were reported in association with omitting aspiration.
Conclusion: Aspiration during IM injections increases pain and procedure time without reducing complication risk. These findings support current international guidelines discouraging routine aspiration, particularly in pediatric and vaccine-related applications. Injection technique should be individualized based on patient characteristics and medication type.
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