Injection pressure levels for creating blebs during subretinal gene therapy.

Area of Science:

• Ophthalmology
• Retinal Surgery
• Gene Therapy

Background:

• Subretinal gene therapy delivery is associated with retinal damage due to increased injection pressure in animal models.
• Human clinical data on pressures required for subretinal bleb formation are lacking.

Purpose of the Study:

• To characterize intraoperative pressure levels during subretinal gene therapy delivery.
• To investigate the relationship between patient age, retinal condition, and injection pressure.

Main Methods:

• Analysis of intraoperative data from 70 patients undergoing pneumatic-assisted subretinal gene therapy.
• Use of a 41-gauge injection cannula and balanced salt solution (BSS) pre-bleb technique.
• Masked analysis of patient age and pressure data for BSS and vector injections.

Main Results:

• No significant differences in injection pressures were observed across eight different retinal conditions.
• Patient age was identified as a factor affecting maximum injection pressures for bleb propagation.
• The relationship between age and pressure varied depending on the specific retinal condition.

Conclusions:

• Intraoperative injection pressures in subretinal gene therapy are influenced by patient age, not solely by retinal condition.
• These findings are crucial for optimizing surgical protocols in subretinal gene therapy.
• Further research may refine pressure management strategies to minimize retinal damage.