摘要
Dear Editor,As we all know,pulmonary hypertension is a state of persistent pulmonary artery pressure above 25 mm Hg at rest and greater than 30 mm Hg during exercise.Based on the mechanism or underlying etiology,pulmonary hypertension was classified as primary with no identifiable cause or secondary because of increased pressure in the pulmonary venous or pulmonary capillary system[1].
作者简介
Co-first authors:Hai-Jiang Zhang;Co-first authors:Rong Huang;Correspondence to:Liang Liang.The First College of Clinical Medical Science,China Three Gorges University,Department of Ophthalmology,Yichang Central People’s Hospital,Yichang 443003,Hubei Province,China.Iiangliang419519@126.com。
