title: Determination of the effect of a single hemodialysis session on retrobulbar blood hemodynamics by color Doppler ultrasonography.
abstract: BACKGROUND
  Retrobulbar hemodynamic alterations can occur during hemodialysis sessions, and patients with chronic renal failure may experience visual problems.
  
  
  OBJECTIVE
  To evaluate the effect of single-session hemodialysis on retrobulbar vessel hemodynamics by color Doppler ultrasonography.
  
  
  METHODS
  Thirty-five patients were included in the study. Retrobulbar blood flows were examined before and after dialysis sessions. Doppler spectral patterns of retrobulbar blood flow were evaluated. The t test for paired samples and the Wilcoxon matched-pairs signed-rank test were used for comparing the flow values before and after dialysis.
  
  
  RESULTS
  Systolic and diastolic blood flow velocities of the ophthalmic artery, central retinal artery, central retinal vein, nasal posterior ciliary artery, and temporal posterior ciliary artery were found to be decreased bilaterally after hemodialysis sessions. No significant change was observed in resistivity index values after hemodialysis sessions.
  
  
  CONCLUSIONS
  Our findings reveal that retrobulbar circulation was disturbed after a single hemodialysis session.
authors.affiliation: Department of Radiology, Ankara Atatürk Education and Research Hospital, Ankara, Turkey. ztosun@yahoo.com
authors.forename: O
authors.initials: O
authors.lastname: Tosun
authors.forename: B
authors.initials: B
authors.lastname: Davutluoglu
authors.forename: K
authors.initials: K
authors.lastname: Arda
authors.forename: M
authors.initials: M
authors.lastname: Boran
authors.forename: A
authors.initials: A
authors.lastname: Yarangumeli
authors.forename: A
authors.initials: A
authors.lastname: Kurt
authors.forename: D
authors.initials: D
authors.lastname: Ozkan
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D005123:Eye / Q000098:blood supply* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000000981:diagnostic imaging* / Q000503:physiopathology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D012039:Regional Blood Flow / Q000502:physiology; D006435:Renal Dialysis; D018615:Ultrasonography, Doppler, Color; D014655:Vascular Resistance / Q000502:physiology