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Accuracy and precision of intraocular injection volume
Jhansi R Raju1, David V Weinberg
1Department of Ophthalmology, Northwestern University Medical School, Chicago, Illinois 60611, USA.
American Journal of Ophthalmology
|April 5, 2002
Summary
Intraocular drug injections often deliver less medication than intended, impacting treatment efficacy. This study found that common clinical methods systematically underdeliver volumes, particularly at smaller doses.
Area of Science:
- Ophthalmology
- Pharmacology
- Medical Devices
Background:
- Accurate drug delivery is crucial for effective intraocular treatments.
- Variability in injection volumes can lead to suboptimal therapeutic outcomes.
Purpose of the Study:
- To evaluate the accuracy and precision of syringes used for intraocular drug injections.
- To determine if clinical methods consistently deliver the intended drug volume.
Main Methods:
- An experimental laboratory investigation involving 800 injections.
- Utilized 20 different 1-ml syringes for intended volumes of 0.10 ml and 0.05 ml.
- Injection volumes were precisely measured using an analytic balance.
Main Results:
- All syringes systematically underdelivered the intended volume (P <.001).
- 7% of 0.10 ml injections and 22% of 0.05 ml injections deviated by 20% or more.
- Overdelivery of medication was rarely observed.
Conclusions:
- Current clinical methods for intraocular injections exhibit significant underdelivery.
- This systematic underdelivery may compromise treatment effectiveness.
- Further research into standardized injection techniques and devices is warranted.