Histology Evaluation of Radiofrequency Ablation

Summary

Trichiasis is a disorder of misdirected eyelashes in which the lashes grow inward towards the eye. Trichiasis can occur as a result of chronic inflammation, infection, such as in herpes or trachoma, trauma, or rare diseases like ocular cicatricial pemphigoid or Stevens-Johnson syndrome. Trichiasis can result significant pain and corneal compromise, ranging from punctate erosions to frank abrasions, as the lashes constantly contact and irritate the ocular surface. Several treatment modalities are available, including mechanical epilation, electroepilation, cryotherapy, laser therapy, and surgical procedures to redirect the lashes. Radiofrequency ablation is a type of electroepilation that utilizes radiowaves to heat and destroy hair follicles. A fine needle is inserted into the follicle and current is applied to destroy the follicle. The needle allows the energy to be focused into the follicle and limits scarring of the surrounding tissues, and the follicles are in theory permanently destroyed in this procedure. Success rates are variable however, ranging from 56 to 90%. Currently, there is no standardized protocol for performing radiofrequency ablation. Many practitioners choose their power settings based on experience, and the Ellman Surgitron machine, a commonly used radiofrequency unit, actually states in their instructions that the power should be titrated based on user experience. In the literature, settings anywhere from 1 to 3 are seen. In this study, our purpose is to examine the effects of different power settings in radiofrequency at the histologic level. The investigators plan to test different power settings on eyelid tissue that would be normally excised and discarded during eyelid correction surgeries. The investigators hope to determine if there is an ideal power setting to achieve hair follicle destruction while minimizing surrounding tissue damage, which could then be used as the standard power setting for radiofrequency ablation of trichiatic lashes in clinical practice. The investigators hypothesize that as power increases, the extent and severity of tissue damage will increase.

Conditions

• Trichiasis

Interventions

DEVICE

Radiofrequency ablation

The eyelid segments to be excised as part of their planned lateral tarsal strip procedure will be marked and divided into 4 equal sections (2 sections on each lid). A corneal shield will be placed into the fornix prior to treatment. Each section will be treated with the designated power setting in the following manner. The probe will be inserted into the follicle under direct visualization to a depth of approximately 1.4 mm. The designated power will be applied for 1 second. All lashes in each segment will be treated. The segments will then be excised and placed into labelled and coded containers of formalin.

Sponsors & Collaborators

• Ochsner Health System

  lead OTHER

Principal Investigators

• Priya Sahu, MD · Ochsner Health System

• Jayne Weiss, MD · Louisiana State University Health Sciences Center

Study Design

Allocation

NON_RANDOMIZED

Purpose

OTHER

Masking

SINGLE

Model

FACTORIAL

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2019-07-02

Primary Completion

2020-06-22

Completion

2020-06-22

FDA Device

Yes