Comparative Study Between Lidocaine Gel 2% and 5% for Ophthalmic Procedures

Area of Science:

• Ophthalmology
• Anesthesiology
• Clinical Trials

Background:

• Topical anesthetic gels are commonly used for ophthalmic procedures.
• Lidocaine gel is a frequent choice for topical anesthesia.
• Comparing different concentrations of lidocaine gel is important for optimizing patient comfort and safety.

Purpose of the Study:

• To compare the same-day pain control and safety of 5% and 2% lidocaine gel.
• To determine if 5% lidocaine gel is more effective in reducing pain during conjunctival clamping compared to 2% lidocaine gel.
• To assess corneal and conjunctival safety profiles of both concentrations.

Main Methods:

• Prospective, randomized, double-blind clinical trial.
• Patients received either 2% or 5% lidocaine gel in each eye.
• Pain during gel instillation and conjunctival clamping was assessed at 5 and 10 minutes post-application.
• Corneal and conjunctival staining was graded using the Oxford scale.

Main Results:

• Eighty eyes from 40 patients were analyzed.
• 5% lidocaine gel showed higher initial discomfort during instillation (P=0.092).
• Pain during conjunctival clamping was significantly lower with 5% lidocaine gel at 5 and 10 minutes (P<0.001).
• No significant difference in tear break-up time was observed between groups.
• The majority of patients (80%) experienced no corneal or conjunctival staining.

Conclusions:

• Both 5% and 2% lidocaine gel demonstrate similar efficacy in pain control at 5 minutes post-instillation.
• 5% lidocaine gel appears to offer a longer duration of action for pain relief.
• Neither concentration of lidocaine gel resulted in corneal toxicity.