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Polyquaternium-1–Associated Dendritiform Keratopathy

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Purpose: To report a case of polyquaternium-1 (Polyquad, PQ-1)–associated dendritiform keratopathy that developed after exposure to the tear substitute Systane (Alcon Laboratories, Inc, Fort Worth, TX). Methods: A retrospective review of the case was performed. Results: Dendritiform keratopathy developed in the patient after an increase in the use of topical Systane from 4 times per day to every hour. Keratopathy resolved with discontinuation of Systane. Conclusions: Polyquaternium-1–associated dendritiform keratopathy can occur in patients who have previously tolerated the preservative. Because keratopathy seems to have developed and improved because of dose-dependent factors, the mechanism is more likely toxicity than hypersensitivity.
Ovid Technologies (Wolters Kluwer Health)
Title: Polyquaternium-1–Associated Dendritiform Keratopathy
Description:
Purpose: To report a case of polyquaternium-1 (Polyquad, PQ-1)–associated dendritiform keratopathy that developed after exposure to the tear substitute Systane (Alcon Laboratories, Inc, Fort Worth, TX).
Methods: A retrospective review of the case was performed.
Results: Dendritiform keratopathy developed in the patient after an increase in the use of topical Systane from 4 times per day to every hour.
Keratopathy resolved with discontinuation of Systane.
Conclusions: Polyquaternium-1–associated dendritiform keratopathy can occur in patients who have previously tolerated the preservative.
Because keratopathy seems to have developed and improved because of dose-dependent factors, the mechanism is more likely toxicity than hypersensitivity.

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