Optical Coherence Tomography Imaging of Erythematotelangiectatic Rosacea During Treatment With Brimonidine Topical Gel 0.33%: A Potential Method for Treatment Outcome Assessment
July 2014 | Volume 13 | Issue 7 | Original Article | 821 | Copyright © July 2014
Jennifer Urban BS,a Arunee H. Siripunvarapon MD,b Adam Meekings BS,c
Amy Kalowitz BS,b and Orit Markowitz MD FAADb
aStony Brook University School of Medicine, Stony Brook, NY
bDepartment of Dermatology, Mount Sinai Medical Center, New York, NY
cMichelson Diagnostics Ltd., Orpington, Kent, United Kingdom
OBJECTIVE: To examine and describe how OCT skin morphology changes when exposed to brimonidine topical gel 0.33% in the treatment of erythematotelangiectatic rosacea.
METHODS: Normal in vivo telangiectasias and erythematous patches and papules were examined prior to treatment clinically, dermatoscopically, and through OCT scans. Brimonidine topical gel 0.33% was applied to the face and OCT images were acquired at defined time intervals: baseline; immediately (<5 minutes) after application; 4 hours after application; and after 2 weeks’ once daily application. OCT morphology was then described.
RESULTS: OCT imaging showed an increase in the mean gray value (MGV), a measure of dermal reflectivity, corresponding to a decrease in dermal edema. MGV measurements for the nasal telangiectasia were: baseline, MGV 10,471 (standard deviation [SD] 6,847); immediate, MGV 15,634 (SD 8,983); after 4 hours, MGV 16,357 (SD 7,647); and after 2 weeks, MGV 15,505 (SD 6,870). MGV measurements for the chin erythema were: baseline, MGV 8,850 (SD 4,969); immediate, MGV 10,799 (SD 5,266); after 4 hours, MGV 12,419 (SD 6,714); and after 2 weeks, MGV 13,395 (SD 6,170). No significant change in vessel lumen diameter was appreciated. Vessel lumen diameter for the facial papule ranged from 0.13 mm at baseline, 0.09 mm immediately after treatment, 0.09 mm after 4 hours, and 0.11 mm after 2 weeks.
CONCLUSIONS: OCT scanning showed a decrease in the dermal hyporeflectivity of the dermis consistent with a decrease in dermal edema. The OCT scans obtained did not show any significant change in vessel lumen diameter. These results may reflect an increase in vascular tone, which can be attributable to the clinical improvement and decreased erythema noted in the patient. This technology could potentially be used for the non-invasive in vivo monitoring of other topical treatments.
J Drugs Dermatol. 2014;13(7):821-826.