Association Between Heart Rate Variability and Systemic Endothelin-1 Concentration in Normal-tension Glaucoma

To investigate the association between heart rate variability (HRV) and the plasma level of endothelin-1 (ET-1) in normal-tension glaucoma (NTG).Twenty-four patients with NTG were enrolled. Subjects with systemic diseases were excluded. All patients underwent a complete ophthalmic examination and were referred to the rheumatology department, where HRV assessment was performed. Patients were divided into two groups according to the standard...