Retrobulbar Hyaluronidase Injection: Does It Reach the Eye?

Area of Science:

• Ophthalmology
• Pharmacology
• Biochemistry

Background:

• Retrobulbar injections are common ophthalmic procedures.
• Hyaluronidase is an enzyme that degrades hyaluronic acid, potentially affecting tissue permeability.

Purpose of the Study:

• To investigate if retrobulbar hyaluronidase injection reaches the vitreous cavity.
• To quantify hyaluronidase concentration in the vitreous after retrobulbar administration.

Main Methods:

• A prospective case-control study involving 30 patients undergoing eye evisceration.
• Retrobulbar injection of 3,000 IU hyaluronidase in test group; vitreous samples from controls undergoing vitrectomy.
• Hyaluronidase concentration measured using ELISA; analysis performed up to 60 minutes post-injection.

Main Results:

• Analyzed 15 test and 15 control vitreous samples.
• No significant difference in hyaluronidase concentration between retrobulbar injection group and controls.
• Detected hyaluronidase levels ranged from 1.5 to 3.0 µg/ml in both groups.

Conclusions:

• Retrobulbar hyaluronidase injection does not lead to higher concentrations in the posterior vitreous.
• The enzyme's presence in the vitreous cavity was not significantly elevated compared to controls within 60 minutes.