Intimal cushions in ciliary arteries of the dog

1974 ◽  
Vol 30 (2) ◽  
pp. 188-189 ◽  
Author(s):  
K. Jellinger
Keyword(s):  
Ciliary Arteries

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.

scholarly journals Choroidal Ischemia Sparing the Watershed Zone following Intra-Arterial Chemotherapy for Retinoblastoma

2018 ◽  
Vol 5 (3) ◽  
pp. 190-194 ◽  
Author(s):  
David Arturo Ancona-Lezama ◽  
Lauren A. Dalvin ◽  
J. Antonio Lucio-Alvarez ◽  
Pascal Jabbour ◽  
Carol L. Shields
Keyword(s):  
Vision Loss ◽  
Tumor Control ◽  
Bilateral Retinoblastoma ◽  
Choroidal Ischemia ◽  
Lateral Posterior ◽  
Ciliary Arteries ◽  
Choroidal Perfusion ◽  
Choroidal Vessels ◽  
Complete Tumor

Purpose: Intra-arterial chemotherapy (IAC) has become a mainstay in the management of retinoblastoma, especially in advanced or refractory disease. However, IAC is not without complications, and chemotherapy toxic effects can lead to partial or complete choroidal ischemia, often causing vision loss. Methods: This is a case report. Results: A 4-month-old girl with bilateral retinoblastoma was treated with secondary IAC (melphalan 5 mg) for recurrent tumor following intravenous chemotherapy. One month later, complete tumor control was achieved. However, she demonstrated broad choroidal ischemia in the nasal and temporal quadrants but sparing of the watershed zone superior and inferior to the optic disc and in the papillomacular region. Fluorescein angiography revealed poor perfusion of the choriocapillaris with visibility of the large choroidal vessels in the nasal and temporal areas but preserved perfusion of the watershed zone. The watershed zone remained intact on the 10-month follow-up, and the final visual acuity was fix and follow without strabismus. Conclusion: The pathophysiology of choroidal ischemia is not well understood, but the fortuitous watershed zone preservation in this case could represent uneven distribution of the chemotherapeutic drug, resulting in partial chemo-dilution of the medication in the watershed region, which represents the final downstream overlapping choroidal perfusion from both medial and lateral posterior ciliary arteries.

Topographic Analysis of Short Posterior Ciliary Arteries Using Wide-Field Swept-Source En-Face Optical Coherence Tomography

2021 ◽  
Author(s):  
Raphael Lejoyeux ◽  
Raphael Atia ◽  
Kiran Vupparaboina ◽  
Mohamed Ibrahim ◽  
Jose-Alain Sahel ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Posterior Pole ◽  
Wide Field ◽  
Temporal Part ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Swept Source ◽  
Topographic Analysis ◽  
En Face ◽  
Ciliary Arteries

Abstract Purpose: To study the topographic distribution of the short posterior ciliary arteries (SPCA) entry sites into the choroid in normal eyes using structural en-face swept source optical coherence tomography (SS-OCT). Methods: Retrospective analysis of SS-OCT scans (wide-field structural SS-OCT 12x12mm) of 13 healthy subjects was performed. Cross-sectional swept-source OCT scans derived from a volume scan were represented as en-face image display following the Choroid-Scleral Interface to obtain en-face OCT. SPCAs in their last scleral location before choroidal entrance were identified manually, counted and localized by two masked observers. Correlations between two masked observers were analyzed using inter- and intra- class correlation. Results: Accuracy for the choroidal inner and outer border segmentation was 95-99%. Eighteen eyes from 13 normal subjects were included for SPCA analysis. The mean number of arteries was 13.8±3.5 per eye. Thirty-six percent were in the center of the posterior pole image; however, 21% were in the temporal part of the posterior pole. Median accuracy of the detection is 0.94. The correlation between the two observers was fair (0.54).Conclusion: Our algorithm allows visualization of the SPCA at the posterior pole of the eye using wide-field en-face SS-OCT. It can also help the clinicians to study the SPCAs in numerous ocular diseases, particularly its relationship with focal choroidal diseases.

scholarly journals Nitroxidergic nerve function is inhibited by neurogenic ACh but not by VIP in porcine ciliary arteries

1999 ◽  
Vol 79 ◽  
pp. 214
Author(s):  
Megumi Toda ◽  
Kazuhide Ayajiki ◽  
Hideyuki Fujioka ◽  
Tornio Okamura ◽  
Ikuo Azuma ◽  
...  
Keyword(s):  
Nerve Function ◽  
Ciliary Arteries

scholarly journals ANTERIOR SEGMENT ISCHEMIA AND STRABISMUS SURGERY: FROM THE ANATOMY TO THE CLINIC. Isquemia del segmento anterior y cirugía del estrabismo: Desde la Anatomía a la Clínica.

2016 ◽  
Vol 7 (1) ◽  
pp. 44-51
Author(s):  
Abraham Olvera-Barrios ◽  
Rodrigo E Elizondo Omaña ◽  
Verónica E Tamez-Tamez ◽  
María de los A. García-Rodríguez ◽  
Eliud V Villarreal-Silva ◽  
...  
Keyword(s):  
Risk Factors ◽  
Clinical Picture ◽  
Surgical Procedure ◽  
Preventive Measures ◽  
Anterior Segment ◽  
Strabismus Surgery ◽  
Extraocular Muscles ◽  
Factores De Riesgo ◽  
Ciliary Arteries ◽  
Anterior Segment Ischemia

La isquemia del segmento anterior es una complicación seria que puede presentarse después de la cirugía de estrabismo, particularmente después de desinsertar tres o cuatro músculos extraoculares, con la sección de sus respectivas arterias ciliares anteriores. Sin embargo, susceptibilidad individual y una cantidad considerable de factores de riesgo juegan también un papel importante en el desarrollo de esta condición que pone en peligro la vista. Una evaluación minuciosa es fundamental para cada paciente. Por lo tanto, conocer la irrigación del segmento anterior junto con los mecanismos que producen la isquemia de esta región del ojo es de suma importancia para evaluar a los pacientes, para planear y decidir qué procedimiento quirúrgico es el mejor para cada caso en particular, y para prevenir la ocurrencia de esta complicación. La revisión de la anatomía descriptiva y su posterior correlación con el cuadro clínico de esta entidad facilita el entendimiento de la patogénesis de la isquemia y crea conciencia acerca de la necesidad de instituir medidas preventivas. Anterior segment ischemia is a serious complication that may occur after strabismus surgery, particularly after the deinsertion of three or four extraocular muscles, with transection of their anterior ciliary arteries. However, individual susceptibility and a considerable amount of risk factors also play an important role in the development of this condition, which endangers sight. A thorough evaluation is essential for each patient. Therefore, knowing the irrigation of the anterior segment along with the mechanisms that produce ischemia of the eye region is very important to assess patients, plan and decide which surgical procedure is best for each particular case, and to prevent the occurrence of this complication. Review of the descriptive anatomy and its subsequent combination with the clinical picture of this entity facilitates understanding of the pathogenesis of ischemia and raises awareness about the need to institute preventive measures.  

Comparison of the autoregulatory mechanisms between central retinal artery and posterior ciliary arteries after thigh cuff deflation in healthy subjects

2011 ◽  
Vol 82 (3) ◽  
pp. 269-273 ◽  
Author(s):  
Semira Kaya ◽  
Julia Kolodjaschna ◽  
Fatmire Berisha ◽  
Leopold Schmetterer ◽  
Gerhard Garhöfer
Keyword(s):  
Healthy Subjects ◽  
Central Retinal Artery ◽  
Cuff Deflation ◽  
Ciliary Arteries ◽  
Retinal Artery

Calcific Emboli of the Retinal and Ciliary Arteries

1970 ◽  
Vol 69 (3) ◽  
pp. 372-375 ◽  
Author(s):  
Sahag A. Baghdassarian ◽  
J. Brooks Crawford ◽  
J. Earl Rathbun
Keyword(s):  
Ciliary Arteries
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