Colour Doppler Imaging of Ocular and Orbital Blood Vessels in Retinal Diseases

2011 ◽  
Vol 05 (01) ◽  
pp. 16 ◽  
Author(s):  
Galina Dimitrova ◽  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Central Retinal Artery ◽  
Age Related Macular Degeneration ◽  
Doppler Imaging ◽  
Retinal Diseases ◽  
Colour Doppler ◽  
Colour Doppler Imaging ◽  
Retinal Artery

Colour Doppler imaging (CDI) is an established method for investigation of the ocular and orbital blood flow characteristics. It has been employed for assessment of blood flow parameters in a number of studies that investigated retinal diseases, including vascular pathology, degenerations, dystrophies, tumours, retinal detachment, etc. Decreased retrobulbar blood flow velocity in the central retinal and the short posterior ciliary artery has been reported in diabetic retinopathy. Reduced blood flow velocity in the central retinal artery and vein was also reported in patients with central retinal artery and vein occlusion. In exudative age-related macular degeneration there was an irregular blood flow in the retrobulbar short posterior ciliary arteries that was suggested to play a role in the pathogenesis of the disease. In addition to research, CDI has also been reported as a valuable tool for the clinical management of retinal diseases.

scholarly journals Measurement of ocular blood flow velocity using colour doppler imaging in low tension glaucoma

Eye ◽  
1995 ◽  
Vol 9 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Zahida Butt ◽  
Graham McKillop ◽  
Colm O'Brien ◽  
Paul Allan ◽  
Peter Aspinall
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ocular Blood Flow ◽  
Doppler Imaging ◽  
Colour Doppler ◽  
Colour Doppler Imaging ◽  
Low Tension Glaucoma ◽  
Low Tension

scholarly journals The effect of preset intraoperative intraocular pressure during phacoemulsification on the blood flow velocity in the central retinal artery

2020 ◽  
Vol 12 (4) ◽  
pp. 5-12
Author(s):  
Yuri V. Takhtaev ◽  
Tatyana N. Kiseleva ◽  
Roman B. Shliakman
Keyword(s):  
Blood Flow ◽  
Intraocular Pressure ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ocular Blood Flow ◽  
Central Retinal Artery ◽  
Doppler Imaging ◽  
Diastolic Phase ◽  
Retinal Artery ◽  
Central Retinal Vein

Aim. To evaluate the effect of preset elevated intraocular pressure (IOP) level during phacoemulsification on central retina artery and central retinal vein hemodynamics and to determine possible compensatory mechanisms of the ocular blood flow autoregulation in response to intraoperational IOP jump. Methods. This prospective study included 23 cataract patients without concomitant ocular vascular conditions (15 women and 8 men) aged from 62 to 83 years. The mean age was 72.5 5.7 years. In all patients, an intraoperational color duplex scanning in the regimens of color Doppler imaging and pulsed wave velocity imaging using ultrasound scanner Logiq S8 (GE). The blood flow was estimated in retrobulbar vessels: central retinal artery, central retinal vein with maximal systolic velocity, end-diastolic velocity of the blood flow, and resistance index (RI). The investigation was performed under IOP control, which was measured using Icare Pro tonometer, and under blood pressure control using patient monitoring system Draeger Vista 120. In the operating room, ocular blood flow was examined three times: immediately before surgery, straight after the surgical incision sealing at preset intraoperational IOP level, and after IOP normalization and repeated sealing of the corneal tunnel. Results. Under preset intraoperational IOP maintenance on 58.01 8.10 mm Hg level, there was a clinically significant (p 0.05) decrease of blood flow velocity in the central retinal artery. In 30.4% of cases, the blood flow velocity in the central retinal artery during diastolic phase was not registered. The flow velocity in central retinal vein did not change significantly, and did not depend on IOP level (p 0.05). Conclusions. At the 5560 mm Hg IOP level, in humans, compensatory blood flow autoregulation mechanisms in response to intraoperational IOP jumps are absent, up to complete blood flow stop in the central retinal artery at the diastolic phase, and this could be a risk factor for retinal ischemia.

scholarly journals Agreement among three examiners of colour Doppler imaging retrobulbar blood flow velocity measurements

2011 ◽  
Vol 89 (8) ◽  
pp. e631-e634 ◽  
Author(s):  
Panayiota Founti ◽  
Alon Harris ◽  
Domniki Papadopoulou ◽  
Petros Emmanouilidis ◽  
Brent Siesky ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Doppler Imaging ◽  
Velocity Measurements ◽  
Colour Doppler ◽  
Colour Doppler Imaging ◽  
Retrobulbar Blood Flow

scholarly journals Hemodynamic parameters in the central retinal artery in active retinopathy of prematurity and their relationship with the central retinal vein

2021 ◽  
pp. 21-29
Author(s):  
I.G. Trifanenkova ◽  
◽  
A.V. Tereshchenko ◽  
E.V. Erohina ◽  
◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Retinopathy Of Prematurity ◽  
Blood Flow Velocity ◽  
Central Retinal Artery ◽  
Duplex Scanning ◽  
Subsequent Stage ◽  
Hemodynamic Parameters ◽  
Retinal Artery ◽  
Central Retinal Vein

Purpose. To analyze the main hemodynamic parameters in the central retinal artery, as well as their relationship with hemodynamic indicators in the central retinal vein, depending on the stage and type of active ROP with the use of color duplex scanning. Material and methods. The 63 premature babies with various stages of active ROP and no signs of ROP were included in the study. The 55 children with active ROP included in the study were distributed according to the stages and type of disease course. All children were at the same gestational age at the time of examination – 37–38 weeks of postmenstrual age or at 6–11 weeks of life. For all these children were performed color duplex scanning of the vessels of the eye and orbit in the modes of color Doppler mapping and pulsed Doppler. Results. The study of the hemodynamic features of the central retinal artery in premature infants with active ROP showed that the progression of the disease was accompanied by a significant increase in blood flow velocity (Vsyst and Vdiast) with each subsequent stage of ROP. A higher index of peripheral vascular resistance is recorded in comparison with the non-progressive favorable type for children with an unfavorable course of the disease.The analysis of the ratio of the maximum blood flow velocities in the central retinal artery and central retinal vein made it possible to determine in which of the vessels the hemodynamic changes are most pronounced, depending on the stage and form of active ROP. Conclusion. Thus, there are statistically significant changes in such large vessels of the retinal bed as the central retinal artery and central retinal vein during active ROP. Color duplex scanning, having a significant diagnostic potential in assessing hemodynamic parameters, made it possible to obtain reliable information about the linear blood flow velocity and the state of peripheral resistance in the central retinal artery and their relationship with the central retinal vein. This information opens up prospects for improving the accuracy of predicting the nature of the course of the disease, especially i n the early stages. Keywords: color duplex scanning, active retinopathy of prematurity, hemodynamic parameters, central retinal artery, central retinal vein

Usefulness of orbital colour Doppler ultrasound in vascular-related monocular vision loss

2021 ◽  
pp. 1358863X2199321
Author(s):  
Gerardo Ruiz-Ares ◽  
Blanca Fuentes ◽  
Jorge Rodríguez-Pardo de Donlebún ◽  
Maria Alonso de Leciñana ◽  
Raquel Gutiérrez-Zúñiga ◽  
...  
Keyword(s):  
Blood Flow ◽  
Doppler Ultrasound ◽  
Vision Loss ◽  
Monocular Vision ◽  
Central Retinal Artery ◽  
Doppler Imaging ◽  
Colour Doppler ◽  
Colour Doppler Ultrasound ◽  
Transient Monocular Blindness ◽  
Retinal Artery

Acute, painless, monocular vision loss (APMVL) usually has a vascular aetiology. We conducted a prospective observational study from 2011 to 2018 to analyse the added value of colour Doppler imaging to assess orbital vessel blood flow in the diagnosis of APMVL. The study included 67 patients (39 [58.2%] men; mean age, 65.9 years [SD 13.7]) with APMVL evaluated at the Neurosonology Laboratory within the first 5 days of symptom onset, who were classified as having either transient or persistent monocular blindness. The blood flow in the ophthalmic and central retinal arteries was assessed using colour Doppler ultrasound with a linear 7.5-MHz transducer. Thirty-three (49.3%) patients presented transient monocular blindness, with reduced blood flow in either the ophthalmic or central retinal artery. The group with persistent vision loss included 24 cases of central retinal artery occlusion (CRAO) and 10 cases of ischaemic optic neuropathy (35.8% and 14.9%, respectively, of the total sample). These patients were older and had a higher prevalence of hypertension and mild carotid atherosclerosis. Orbital colour Doppler ultrasound (OCDUS) clarified the mechanism/cause of the ischaemia in 11 (16.4%) patients and showed abnormal flow in 46 (68.7%) patients, confirming the vascular origin in 19 (57.6%) of the transient monocular blindness cases. Lower peak systolic velocity was observed in patients with CRAO ( p < 0.001), and a velocity < 10 cm/s in the central retinal artery was independently associated with the diagnosis of CRAO. OCDUS can be helpful in confirming the vascular cause and identifying the aetiology of APMVL.

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