Spasmodic Occlusion of Central Retinal Artery, Early Restoration of Blood Flow, But no Useful Vision

1929 ◽  
Vol 12 (10) ◽  
pp. 827-828 ◽  
Author(s):  
George L. King
Keyword(s):  
Blood Flow ◽  
Central Retinal Artery ◽  
Retinal Artery ◽  
Early Restoration

The effect of increased intraoperative intraocular pressure on blood flow in the central retinal artery and posterior short ciliary arteries during phacoemulsification

2020 ◽  
pp. 147-148
Author(s):  
R.B. Shliakman ◽  
◽  
Y.V. Takhtaev ◽  
T.N. Kiseleva ◽  
◽  
...  
Keyword(s):  
Blood Flow ◽  
Intraocular Pressure ◽  
Vision System ◽  
Central Retinal Artery ◽  
Ciliary Arteries ◽  
Retinal Artery

Актуальность. Принципом факоэмульсификации является поддержание баланса ирригационно-аспирационных потоков. Баланс достигается за счет различных систем подачи жидкости, позволяющих хирургу задавать и поддерживать постоянный уровень ВГД во время операции. Вопрос об оптимальном безопасном уровне ВГД во время вмешательства на сегодняшний день остается открытым. Цель. Оценить влияние повышенного уровня интраоперационного офтальмотонуса на скорость кровотока в центральной артерии, вене сетчатки, и задних коротких цилиарных артериях. Материал и методы. В исследование было включено 29 пациентов с начальной катарактой. Факоэмульсификация выполнялась на приборе Alcon Centurion vision system на предустановленном интраоперационном уровне ВГД 60 мм.рт.ст. Скорость кровотока измеряли путем дуплексного сканирования в режиме ЦДК трёхкратно: до вскрытия глазного яблока, интраоперационно на уровне ВГД (58.77±8.28 мм.рт. ст) и сразу после герметизации доступа и нормализации ВГД. Каждое измерение сопровождалось контролем ВГД и АД. Результаты. При значении уровня ВГД 58.77±8.28 мм.рт. ст в ЦАС и ЗКЦА отмечалось статистически достоверное снижение максимальной систолической скорости кровотока. С 12,62±3,07 до 9,93±2,77 см/с и снижение конечной диастолической скорости кровотока с 3,94±1,09 до 1,79±1,64 см/с. В 11 из 29 (37,9%) случаев скорость кровотока в ЦАС в диастолическую фазу не регистрировалась. Максимальная систолическая скорость кровотока в ЗКЦЛА снизилась на 22%. Конечная диастолическая снизилась с 5,11±1,83 до 2,97±1,27 см/с. Аналогично, максимальная систолическая скорость кровотока с медиальной стороны упала с 12,37±2,74 до 9,50±1,68 см/с, а конечная диастолическая скорость кровотока снизилась с 4,54±1,35 до 2,73± 0,91 см/с. Скорость кровотока в ЦВС менялась незначительно и не зависела от уровня ВГД. Выводы. На уровне ВГД 58.77±8.28 мм. рт. ст. у человека отсутствуют компенсаторные механизмы ауторегуляции глазного кровотока в ответ на резкое повышение интраоперационного уровня ВГД, вплоть до полного прекращения кровотока в ЦАС в диастолическую фазу, что может приводить к ишемии тканей сетчатки.

Association of systemic cardio-vasculature status with retinal vascular endothelium in diabetes

2020 ◽  
Vol 1 (1) ◽  
pp. 52-57
Author(s):  
Galina Dimitrova ◽  
Keyword(s):  
Blood Flow ◽  
Diabetic Retinopathy ◽  
Optic Nerve ◽  
Arterial Stiffness ◽  
Vascular Endothelium ◽  
Lamina Cribrosa ◽  
Central Retinal Artery ◽  
Diabetic Patients ◽  
Retinal Artery ◽  
Central Retinal Vein

The relationship between diabetic retinopathy and macro-vascular complications in diabetes suggests a pathogenic association between these conditions. Vascular endothelium has been identified as a main site of blood vessel injury in diabetes. Diabetic retinopathy is associated with systemic arterial stiffness and altered vascular endothelium function and structure. Retinal vasculature endothelium at the macula, arterio-venous crossings, and in the optic nerve at the lamina cribrosa region is reported to differ from the endothelium in the rest of the retinal blood vessels. The central retinal artery and vein are in close proximity in the optic nerve where they share a common adventitia; thus, increased arterial wall stiffness and thickness may affect blood flow in the neighboring central retinal vein in this region. Moreover, increased arterial stiffness in small arterial beds is associated with retinal venular widening; it suggests the possibility of central retinal artery compressing the central retinal vein at the lamina cribrosa, thereby compromising venular outflow in the retina of diabetic patients. Altered blood flow in the central retinal vein in the postlaminar region has been detected in patients who experience progression of diabetic retinopathy. Increased hydrostatic pressure in the central retinal vein may play a major role in the pathogenesis of diabetic retinopathy. The aim of this review article is to emphasize this pathogenetic mechanism that has often been overlooked.

scholarly journals Associating the biomarkers of ocular blood flow with lamina cribrosa parameters in normotensive glaucoma suspects. Comparison to glaucoma patients and healthy controls

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248851
Author(s):  
Patrycja Krzyżanowska-Berkowska ◽  
Karolina Czajor ◽  
D. Robert Iskander
Keyword(s):  
Blood Flow ◽  
Ophthalmic Artery ◽  
Lamina Cribrosa ◽  
Ocular Blood Flow ◽  
Central Retinal Artery ◽  
Healthy Controls ◽  
Mean Flow ◽  
Posterior Ciliary Artery ◽  
Retinal Artery ◽  
Ciliary Artery

Purpose To evaluate association between ocular blood flow biomarkers and lamina cribrosa parameters in normotensive glaucoma suspects compared to glaucoma patients and healthy controls. Methods A total of 211 subjects (72 normotensive glaucoma suspects, 70 with primary open-angle glaucoma and 69 controls) were included. Ocular blood flow biomarkers in ophthalmic artery, central retinal artery, as well as in nasal and temporal short posterior ciliary arteries were measured using colour Doppler imaging. Lamina cribrosa position was assessed by measuring its depth, deflection depth, lamina cribrosa shape index and its horizontal equivalent (LCSIH) on B-scan images obtained using optical coherence tomography. Results Ocular blood flow biomarkers in glaucoma patients were statistically significantly reduced when compared to healthy controls in peak systolic velocity (PSV) (P = 0.001 in ophthalmic artery and P<0.001 in central retinal artery) and mean flow velocity (Vm) (P = 0.008 in ophthalmic artery and P = 0.008 in central retinal artery), but not statistically significantly different to that of glaucoma suspects except for PSV in central retinal artery (P = 0.011). Statistically significant correlations corrected for age, central corneal thickness and intraocular pressure were found in glaucoma patients between LCSIH and end diastolic velocity of central retinal artery (P = 0.011), and of nasal short posterior ciliary artery (P = 0.028), and between LCSIH and Vm of central retinal artery (P = 0.011) and of nasal short posterior ciliary artery (P = 0.007). No significant correlations were observed between these parameters in glaucoma suspects and healthy controls. Conclusions Impaired ocular blood flow associated with the deformation of lamina cribrosa was found in glaucoma patients, whereas glaucoma suspects had similar lamina cribrosa shape to glaucoma patients but that deformation was not associated with ocular blood flow biomarkers.

scholarly journals 15. Evaluation of Blood Flow of the Central Retinal Artery & Vein by Doppler Color Flow Imaging

1993 ◽  
Vol 49 (8) ◽  
pp. 1040
Author(s):  
Kaoru Matsubara ◽  
Satoru Abe ◽  
Takayuki Itoh ◽  
Katsumi Andoh ◽  
Masanori Yamada ◽  
...  
Keyword(s):  
Blood Flow ◽  
Central Retinal Artery ◽  
Flow Imaging ◽  
Color Flow ◽  
Color Flow Imaging ◽  
Retinal Artery ◽  
Doppler Color ◽  
Doppler Color Flow Imaging

1386: Assessment of Blood Flow Parameters in Central Retinal Artery in Healthy Children and Adolescents

2009 ◽  
Vol 35 (8) ◽  
pp. S204
Author(s):  
Irina P. Shuruigina ◽  
Elena V. Gushina ◽  
Olga L. Eroshenko ◽  
Maxim N. Morgunov
Keyword(s):  
Blood Flow ◽  
Children And Adolescents ◽  
Central Retinal Artery ◽  
Healthy Children ◽  
Flow Parameters ◽  
Retinal Artery

Comparision of the effects of subtenon’s and subconjunctival anesthesia on retroorbital hemodynamics

Open Medicine ◽  
2009 ◽  
Vol 4 (1) ◽  
pp. 84-90
Author(s):  
Hasan Cakmak ◽  
Mehmet Coskun ◽  
Huseyin Simavli ◽  
Mehmet Gumus ◽  
Ali Ipek ◽  
...  
Keyword(s):  
Blood Flow ◽  
Pulsatility Index ◽  
Ophthalmic Artery ◽  
Color Doppler ◽  
Central Retinal Artery ◽  
Doppler Imaging ◽  
Cataract Operation ◽  
Anesthesia Group ◽  
Ciliary Arteries ◽  
Retinal Artery

AbstractThe aim of the study was to compare retroorbital blood flow hemodynamics between subconjunctival and sub-Tenon’s anesthesia. This was a prospective, blinded study and included 80 cases. Patients were monitored and treated in the First Ophthalmology Clinic, Ataturk Training and Research Hospital, Turkey. Sub-Tenon’s anesthesia was performed in 42 cases, and subconjunctival anesthesia was performed in 38 cases. Color Doppler imaging to measure ocular blood flow parameters was performed preoperatively and 21 days after cataract operation in each case. Preoperative and postoperative values of resistivity and pulsatility indices in the ophthalmic, central retinal, and short posterior ciliary arteries were compared. Postoperative mean blood flow velocity measurements of ophthalmic artery were not statistically different between the subconjunctival anesthesia group and the sub-Tenon’s anesthesia group (49.63 ± 14.00 vs. 45.85 ± 13.41; P=0.389). Postoperative RI values were higher in the Subtenon’s anesthesia group than in the subconjunctival anesthesia group, but the difference between two groups was not statistically significant (0.81 ± 0.14 vs. 0.74 ± 0.08; P=0.079). The postoperative pulsatility index of the ophthalmic artery, RI of ophthalmic artery, pulsatility index of the central retinal artery, RI of the central retinal artery, and pulsatility index of the posterior ciliary arteries were not significantly different between the subconjunctival and sub-Tenon’s anesthesia groups. In conclusion, the study suggests that postoperative retroorbital blood flow hemodynamics are the same following sub-Tenon’s and subconjunctival anesthesia.

Effects of Hachimi-jio-gan (Ba-wei-di-huang-wan) on Blood Flow in the Human Central Retinal Artery

2003 ◽  
Vol 31 (03) ◽  
pp. 425-435 ◽  
Author(s):  
Hideyuki Isobe ◽  
Kazuhiko Yamamoto ◽  
Jong-Chol Cyong
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Vascular Resistance ◽  
Eye Diseases ◽  
Central Retinal Artery ◽  
Mean Flow ◽  
Positive Effects ◽  
Before And After ◽  
Retinal Artery ◽  
Blood Flow Velocities

Hachimi-jio-gan (HJG), a chinese herbal formula, and a placebo were given to 12 healthy adults, and the changes in blood flow in the central retinal artery were observed with the latest ultrasonic diagnosis device before and after administration. After administration of HJG, the systolic flow velocity, diastolic flow velocity and mean flow velocity in the central retinal artery showed significant increases. No change was observed in vascular resistance. The subjects deemed suitable for use of HJG showed remarkable increases in blood flow. No changes in blood flow velocities and vascular resistance were observed after administration of the placebo. HJG is frequently used in the aged, often with eye diseases such as cataract. It has been reported that a decrease of blood flow in the central retinal artery becomes more marked in proportion to the progress of various eye diseases. As increases in blood flow were obvious in the cases that were treated with HJG, it is suggested that increases in blood flow in the central retinal artery due to HJG give direct evidence supporting the positive effects of HJG on eye diseases.

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