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BRIEF COMMUNICATION
Year : 2010  |  Volume : 58  |  Issue : 5  |  Page : 425-432
 

Hemi-central retinal artery occlusion in young adults


Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, 18, College Road, Chennai-600 006, Tamil Nadu, India

Date of Submission15-Dec-2008
Date of Acceptance25-Jun-2009
Date of Web Publication2-Aug-2010

Correspondence Address:
Pukhraj Rishi
Sankara Nethralaya, 18, College Road, Chennai-600 006, Tamil Nadu
India
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DOI: 10.4103/0301-4738.67069

PMID: 20689202

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   Abstract 

Amongst the clinical presentations of retinal artery occlusion, hemi-central retinal artery occlusion (Hemi-CRAO) is rarely described. This case series of four adults aged between 22 and 36 years attempts to describe the clinical profile, etiology and management of Hemi-CRAO. Case 1 had an artificial mitral valve implant. Polycythemia and malignant hypertension were noted in Case 2. The third patient had Leiden mutation while the fourth patient had Eisenmenger's syndrome. Clinical examination and fundus fluorescein angiography revealed a bifurcated central retinal artery at emergence from the optic nerve head, in all cases. Color Doppler examination of the central retinal artery confirmed branching of the artery behind the lamina cribrosa. It is hypothesized that bifurcation of central retinal artery behind the lamina cribrosa may predispose these hemi-trunks to develop an acute occlusion if associated with underlying risk factors. The prognosis depends upon arterial recanalisation and etiology of the thromboembolic event.


Keywords: Central retinal artery occlusion, Eisenmenger′s syndrome, embolus, hemi-central artery occlusion, Leiden mutation, malignant hypertension, polycythemia, retinal artery occlusion, thrombosis


How to cite this article:
Rishi P, Rishi E, Sharma T, Mahajan S. Hemi-central retinal artery occlusion in young adults. Indian J Ophthalmol 2010;58:425-32

How to cite this URL:
Rishi P, Rishi E, Sharma T, Mahajan S. Hemi-central retinal artery occlusion in young adults. Indian J Ophthalmol [serial online] 2010 [cited 2014 Sep 3];58:425-32. Available from: http://www.ijo.in/text.asp?2010/58/5/425/67069


Acute retinal arterial obstruction presents as central retinal artery (CRA) obstruction in 57% cases, branch retinal obstruction in 38% and cilioretinal artery obstruction in 5%. [1] It may be related to known preexisting systemic disease or may be an initial manifestation of previously undiagnosed systemic abnormality. In young adults with retinal artery occlusion, associated etiological factors are more often obscure and diverse. [2] Hemi-central retinal artery occlusion (Hemi-CRAO) is an extremely uncommon clinical entity that has hardly been described in the literature. Hereby, we describe systemic and ophthalmologic characteristics of four patients ranging between 22 and 36 years of age, who presented with hemi-central retinal artery occlusion.


   Case Reports Top


Case 1

A 26-year-old gentleman presented with sudden, partial visual field loss in right eye. He had a prosthetic mitral valve implanted, 14 years back. Vision was 20/20 in both eyes. Anterior segment was essentially normal. Right fundus [Figure 1] showed two central retinal artery hemi-trunks instead of main central artery [Figure 2]. Supero-temporal arteriolar attenuation was noted; upper hemi-trunk was shorter. Retinal pigment epithelial alteration was noted; foveal reflex was dull. Left eye was normal. Findings of fundus fluorescein angiography (FFA) [Figure 3], visual field examination [Figure 4], optical coherence tomogram (OCT) [Figure 5], multifocal electroretinogram (mfERG) [Figure 6] and color Doppler study of right eye [Figure 7] are summarized in [Table 1]. A summary of systemic investigations and treatment is included in [Table 2]. A cardiology consult was sought; patient was advised to continue current treatment [Table 2] with regular follow-up.

Case 2

A 36-year-old gentleman reported with sudden visual loss in left eye. He had a similar problem two months back with spontaneous improvement, for which he did not seek any treatment. Vision was 20/20 in right eye and no perception of light in left. Anterior segment examination was normal. Right eye was normal. Left fundus revealed patchy areas of retinal edema over posterior pole and bifurcated central retinal artery [Figure 8] and [Figure 9]. Generalized arteriolar attenuation, box-carring of vessels and cherry red spot at fovea were seen. Treatment was initiated immediately [Table 2]. However, fundus appearance remained same. He was referred to the physician. Next day, the patient reported perception of light in that eye. A platelet-fibrin embolus could be made out in infero-temporal arcade. Findings of FFA [Figure 10]a and b, visual field examination [Figure 11], ERG [Figure 12] and color Doppler study of the right eye are summarized in [Table 1]. A summary of systemic investigations and treatment is included in [Table 2]. Five days later, vision recovered to 20/125. On the tenth day, it improved to 20/40 and after six months it was 20/20. The patient also had regular follow-ups with the hematologist and cardiologist.

Case 3

A 28-year-old lady reported with sudden, painless visual loss in right eye since five days. Diagnosed to have systemic hypertension, rheumatic mitral valve regurgitation and chorea, she was under treatment for the same [Table 2]. Vision was 20/60 in the right eye and 20/20 in the left. Anterior segment examination was unremarkable. Right fundus revealed retinal edema involving superior half, sparing fovea with no embolus [Figure 13] and [Figure 14]. Left eye was normal. Findings of FFA [Figure 15], multifocal ERG [Figure 16] and color Doppler study of the right eye [Figure 17] are summarized in [Table 1]. A summary of systemic investigations and treatment is included in [Table 2]. The patient was detected to have Factor V Leiden mutation (Real time Polymerase Chain Reaction, RT PCR) and was also advised a regular follow-up with cardiologist and hematologist.

Case 4

A 22-year-old young man, a known case of congenital heart disease, reported with decreased vision in left eye since two days. Vision was 20/20 in both eyes. Anterior segment examination was essentially normal. Right fundus was normal. Left fundus revealed retinal edema involving superior half, sparing fovea with no embolus [Figure 18]. Findings of FFA [Figure 19], ERG [Figure 20], visual field examination [Figure 21] and color Doppler study of the right eye [Figure 22] are summarized in [Table 1]. A summary of systemic investigations and treatment is included in [Table 2]. Diagnosed to have Eisenmenger syndrome, the probable cause of vascular occlusion was paradoxical embolism through ventricular septal defect. At six weeks review, retinal edema had reduced with no evidence of anterior segment neovascularisation.


   Discussion Top


CRA commonly originates as a separate stem from the first part of the ophthalmic artery and usually divides into two branches at the disc, each of which further bifurcates into temporal and nasal divisions. Anatomical variations of branching patterns are known. [3] Reports describe a case with two CRAs running independently up to the optic disc and joining at the optic disc to form a loop, from the summit of which arose terminal branches that followed the usual course. [4] However, this anatomical arrangement was not seen in any of our cases. Singh and Dass also describe a branch of CRA originating from behind the lamina cribrosa that supplied the supero-medial part of the retina but this was more of a 'branching' than a 'bifurcation'. [5]

On entering the eye, CRA loses the elastic lamina and has a prominent muscularis as it bifurcates at the optic disc. These histological changes distinguish retinal arteries from muscular arteries of the same size in other tissues. Additionally, the unusually developed muscularis may allow greater constriction of the vessels in response to chemical and pressure changes. [6] These histological changes coupled with the pre-lamina cribrosa branching of CRA may make these hemi-trunks more 'vulnerable' to vascular occlusion, especially in subjects with systemic co-morbid conditions. Hence, hemi-CRAO may be a manifestation of a preexisting systemic condition or a harbinger of a hitherto undiagnosed systemic condition.

Thromboembolic events are the main culprits in the pathogenesis of retinal artery occlusions which can manifest as 'Hemi-CRAO' in a proximally bifurcated CRA. [7],[8] A sole report has described hemi-CRAO occurring in association with sexual activity and sildenafil citrate; a coincidental finding as mentioned by the author. [9] In our series, Case 1 had an artificial mitral valve and was on anticoagulation therapy. Case 2 had polycythemia. Both are well documented etiological factors, [10],[11],[12] which lead to the devastating vascular episode. Genetic mutation in Factor V renders it resistant to anticoagulant effect of endogenous anticoagulant protein C. The most common of these mutations is called the Leiden mutation. [13] Similar etiological factor was reported in a 25-year-old woman with multiple bilateral retinal arteriolar occlusion [14] and in a 33-year-old lady with branch retinal vein occlusion. [15] Case 3 had Leiden mutation. There have been isolated case reports of ocular ischemic features in association with Eisenmenger's syndrome. [16],[17] However, its manifestation as hemi-CRAO (Case 4 in our series) is reported as first of its kind. All patients in this unique case series were young, had angiographic evidence of hemi-CRAO owing to proximal, pre-lamina cribrosal branching pattern of CRA (confirmed by color Doppler) and also had remarkable visual recovery of 20/60 or better.

To conclude, unusual pre-lamina cribrosa (extraocular) branching pattern of central retinal artery coupled with the unique histological features of the retinal arterioles (hemi-trunks) may predispose to the development of 'hemi-central retinal artery occlusion' in young adults with underlying systemic conditions. However, further histopathological studies are required to understand this clinical entity better.


   Acknowledgment Top


Dr. V Suresh, Director, Mediscan Imaging, Chennai for the Doppler imaging.

 
   References Top

1.Brown GC, Reber R. An unusual presentation of branch retinal artery obstruction in association with ocular neovascularization. Can J Ophthalmol 1986;21:103-6.  Back to cited text no. 1  [PUBMED]    
2.Brown GC, Magargal LE, Shields JA, Goldberg RE, Walsh PN. Retinal arterial obstruction in children and young adults. Ophthalmology 1981;88:18-25.  Back to cited text no. 2  [PUBMED]    
3.Duke-Elder S. Blood vessels and nerves of the eye. In: Wyber K, editor. The anatomy of the visual system. System of ophthalmology. Vol. 2. 1 st ed. London: Henry Kimpton; 1969. p. 339-86.  Back to cited text no. 3      
4.Singh S, Dass R. The central artery of the retina I: Origin and course. Br J Ophthalmol 1960;44:193-212.  Back to cited text no. 4  [PUBMED]  [FULLTEXT]  
5.Singh S, Dass R. The central artery of the retina II: Origin and course. Br J Ophthalmol 1960;44:280-99.  Back to cited text no. 5  [PUBMED]  [FULLTEXT]  
6.Park SS, Sigelmann J. Anatomy and cell biology of the retina. In: Tasman W, Jaeger EA, editors. Duane's foundations of clinical ophthalmology Vol. 1. 15 th ed. Hagerstown, MD: Lippincott Williams and Wilkins; 2004. p. 50.  Back to cited text no. 6      
7.Karjailainen K. Occlusion of the central retinal artery and retinal branch arterioles: A clinical, tonographic and fluorescein angiographic study of 175 patients. Acta Ophthalmol Suppl 1971;109:1-95.  Back to cited text no. 7      
8.Sharma S, Brown GC, Pater JL, Cruess AF. Does a visible retinal embolus increase the likelihood of hemodynamically significant carotid artery stenosis in patients with acute retinal arterial occlusion? Arch Ophthalmol 1998;116:1602-6.  Back to cited text no. 8  [PUBMED]    
9.Bertolucci A, Latkany RA, Gentile RC, Rosen RB. Hemi-retinal artery occlusion associated with sexual activity and sildenafil citrate (Viagra). Acta Ophthalmol Scand 2003;81:198-200.  Back to cited text no. 9  [PUBMED]  [FULLTEXT]  
10.Woldoff HS, Gerber M, Desser KB, Benchimol A. Retinal vascular lesions in two patients with prolapsed mitral valve leaflets. Am J Ophthalmol 1975;79:382-5.  Back to cited text no. 10  [PUBMED]    
11.Wilson LA, Keeling PW, Malcolm AD, Russel RW, Webb-Peploe MM. Visual complications of mitral leaflet prolapse. Br Med J 1977;2:86-8.  Back to cited text no. 11  [PUBMED]  [FULLTEXT]  
12.Appen RE, Wray SH, Cogan DG. Central retinal artery occlusion. Am J Ophthalmol 1975;79:374-81.  Back to cited text no. 12  [PUBMED]    
13.Recchia FM, Brown GC. Systemic disorders associated with retinal vascular occlusion. Curr Opin Ophthalmol 2000;11:462-7.   Back to cited text no. 13  [PUBMED]  [FULLTEXT]  
14.Dori D, Beiran I, Gefland Y, Lanir N, Scharf J, Miller B, et al. Multiple retinal arteriolar occlusions associated with coexisting primary antiphospholipid syndrome and factor V Leiden mutation. Am J Ophthalmol 2000;129:106-8.  Back to cited text no. 14      
15.Dhar-Munshi S, Ayliffe WH, Jayne D. Branch retinal arteriolar occlusion associated with familial factor V Leiden polymorphism and positive rheumatoid factor. Arch Ophthalmol 1999;117:971-3.  Back to cited text no. 15  [PUBMED]    
16.Harino S, Motokura M, Nishikawa N, Fukuda M, Sasaoka A, Grunwald JE. Chronic ocular ischemia associated with the Eisenmenger's syndrome. Am J Ophthalmol 1994;117:302-7.  Back to cited text no. 16  [PUBMED]    
17.Krarup JC. Atypical rubeosis iridis in congenital cyanotic heart disease. Report of a case with microhaemangiomas at the pupillary margin causing spontaneous hyphaemas. Acta Ophthalmol 1977;55:581-5.  Back to cited text no. 17      


    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9], [Figure 10], [Figure 11], [Figure 12], [Figure 13], [Figure 14], [Figure 15], [Figure 16], [Figure 17], [Figure 18], [Figure 19], [Figure 20], [Figure 21], [Figure 22]
 
 
    Tables

  [Table 1], [Table 2]


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