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Optimizing needle length and site choice for adult immunization.
Markos Mardourian1, Kevin A Hao1, Whitman Wiggins1
1College of Medicine, University of Florida, Gainesville, FL, USA.
Vaccine
|June 26, 2023
Summary
Optimal deltoid vaccine injection sites and needle lengths were identified using CT scans. A specific posterior and inferior site is recommended over current guidelines to improve intramuscular vaccine delivery.
Area of Science:
- Anatomy
- Vaccinology
- Medical Imaging
Background:
- Current deltoid vaccination guidelines lack robust data.
- Needle length and site selection are critical for intramuscular vaccine efficacy.
Purpose of the Study:
- Determine optimal needle length and vaccination site for deltoid intramuscular injections.
- Improve vaccine administration safety and effectiveness.
Main Methods:
- Utilized 120 shoulder CT scans, categorized by patient weight and sex.
- Measured skin-to-fascia distance and muscle width at various sites.
- Simulated needle lengths (0.625″, 1.0″, 1.5″) to assess inoculation depth.
Main Results:
- A 0.625″ needle at 4 cm distal (Group 1) yielded 100% success.
- 1.0″ and 1.5″ needles at 4 cm distal (Groups 2-4) showed high success rates (>80%) with minimal overpenetration.
- Overpenetration correlated with anterior and superior injection sites.
Conclusions:
- The ideal injection site is 4 cm distal to the posterolateral acromion corner, posterior and inferior to current recommendations.
- Avoid 1.5″ needles for patients under 118 kg to prevent overpenetration.
- This site maximizes intramuscular vaccine delivery and minimizes nerve injury risk.
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