title: Evaluation of resistive index using color Doppler imaging of orbital arteries in geriatric patients with hypertension.
abstract: OBJECTIVE
  Resistive index (RI) is an indirect measurement of blood flow resistance that can be used to evaluate vascular damage in ophthalmologic disease. The purpose of this study was to evaluate the association between RI values of orbital arteries using the color Doppler imaging (CDI) in geriatric hypertensive patients with or without retinopathy.
  
  
  METHODS
  Designed as a cross-sectional study.
  
  
  METHODS
  We evaluated 60 geriatric patients with hypertension (Group 1) and 30 healthy subjects (Group 2). Further, the patients with hypertension were grouped into two: Group 1a consisted of patients with retinopathy (n = 30), and group 1b consisted of patients without retinopathy (n = 30). The mean RI values of ophthalmic artery (OA), central retinal artery (CRA), and posterior ciliary artery (PCA) were measured using CDI.
  
  
  RESULTS
  Compared to group 2, group 1 had significantly higher mean resistive index of PCA levels (P = 0.017), whereas there were no statistical difference in mean resistive indexes of OA and CRA (both P > 0.05). Besides, there were no statistical difference in mean resistive indexes of OA, CRA, and PCA between the group 1a and group 1b (P > 0.05 for all). Mean resistive indexes of OA, CRA, and PCA were significantly correlated with the duration of hypertension (r = 0.268, P = 0.038; r = 0.315, P = 0.014; r = 0.324, P = 0.012, respectively).
  
  
  CONCLUSIONS
  Our study indicates that RI might be a useful marker for the ocular hemodynamic of retinal vessels, provides morphologic and vascular information in hypertension and hypertensive retinopathy.
authors.affiliation: Department of Ophthalmology, Harran University, Sanlıurfa, Turkey.
authors.forename: Ali
authors.initials: A
authors.lastname: Akal
authors.forename: Turgay
authors.initials: T
authors.lastname: Ulas
authors.forename: Tugba
authors.initials: T
authors.lastname: Goncu
authors.forename: Ekrem
authors.initials: E
authors.lastname: Karakas
authors.forename: Omer
authors.initials: O
authors.lastname: Karakas
authors.forename: Fatih
authors.initials: F
authors.lastname: Kurnaz
authors.forename: Fatima Nurefsan
authors.initials: FN
authors.lastname: Boyaci
authors.forename: Omer Faruk
authors.initials: OF
authors.lastname: Yilmaz
authors.forename: Abdulgafur
authors.initials: A
authors.lastname: Bata
authors.forename: Sema
authors.initials: S
authors.lastname: Yildiz
mesh_terms: D000368:Aged; D019842:Ciliary Arteries / Q000000981:diagnostic imaging* / Q000503:physiopathology; D003430:Cross-Sectional Studies; D005123:Eye / Q000098:blood supply*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000503:physiopathology*; D008297:Male; D009880:Ophthalmic Artery / Q000000981:diagnostic imaging* / Q000503:physiopathology; D012161:Retinal Artery / Q000000981:diagnostic imaging* / Q000503:physiopathology; D012164:Retinal Diseases / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D012189:Retrospective Studies; D018615:Ultrasonography, Doppler, Color / Q000379:methods*; D014655:Vascular Resistance