Treatment of systemic hypertension is important for improvement of macular edema associated with retinal vein occlusion

BACKGROUND We report our findings in three cases of unilateral macular edema associated with retinal vein occlusion (RVO) that improved after successful treatment of systemic hypertension alone. METHODS All three cases had systemic hypertension but no diabetes mellitus or other ocular diseases associated with macular edema. All patients were treated only with medication for systemic hypertension. Optical coherence tomography was performed to determine the foveal thickness before and after treatment. RESULTS Case one was a 72-year-old woman with a central RVO who had macular edema in her left eye and a visual acuity (VA) of 20/50. Her blood pressure (BP) was 169/96 mmHg. One month after the initiation of a calcium blocker to treat her systemic hypertension, her BP was decreased, macular edema was reduced, and her VA improved to 20/20. Case two was a 62-year-old woman with branch RVO. Her VA was 20/40 and her BP was 165/97 mmHg. Six weeks after initiation of medication to treat her systemic hypertension, her RVO-related macular edema had decreased and her VA improved to 20/20. Case three was a 71-year-old man with branch RVO. His VA was 20/50 and his BP was 165/87 mmHg. One month after initiation of treatment for systemic hypertension, his RVO-related macular edema had disappeared and his VA improved to 20/20. All three cases had nonischemic RVO by fluorescein angiography, and they did not develop ischemic changes for at least 1 year. CONCLUSION The reduction of macular edema following a decrease in the systemic hypertension suggests that the edema was most likely caused by leakage of fluids from the blood vessels. We recommend that the blood pressure should be measured in all patients with macular edema before initiating intravitreal anti-VEGF therapy.