Mechanical versus Electronic Infusion Systems in Subcutaneous Immunoglobulin Therapy: A Structured Literature Review of Infusion-Site Reactions and Device Performance.

Objective: Objective was to compare spring-driven mechanical and electronic infusion systems used for subcutaneous immunoglobulin (SCIg) therapy in patients with primary or secondary immunodeficiency (PID, SID) and chronic inflammatory demyelinating polyneuropathy (CIDP), with a focus on local infusion-site reactions and reliable dose delivery. Methods: A structured literature review was conducted (PubMed, Cochrane Library, Google Scholar; January 26, 2026). Eligible studies reported safety outcomes. As direct measures of dose delivery were not consistently reported, infusion system performance was evaluated using pharmacodynamic response, with immunoglobulin G (IgG) levels at the end of the study period considered an indicator of successful dose delivery. Data were extracted and descriptively aggregated across studies. Risk of bias was appraised using validated tools appropriate to study design. Results: Fourteen studies met the inclusion criteria (4 mechanical, 10 electronic). Mechanical infusion systems were associated with lower reported proportions of local infusion-site reactions, including swelling (23.1% vs 61.4%), redness (28.6% vs 44.0%), and soreness (22.9% vs 50.0%) compared with electronic infusion systems. Variability across studies was substantial, likely reflecting differences in patient populations, immunoglobulin formulations, infusion protocols, publication era, and outcome reporting methods. Across studies, both mechanical and electronic infusion systems achieved IgG levels consistent with therapeutic targets, supporting effective SCIg delivery. Conclusion: Mechanical infusion systems were associated with consistently lower reported rates of local infusion-site reactions compared with electronic infusion systems in this descriptive synthesis, while both system types effectively achieved IgG levels consistent with adequate dose delivery. Although variability across studies warrants cautious interpretation, the overall pattern suggests a favorable tolerability profile for mechanical systems. Device selection should remain individualized, and further comparative research is warranted.