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Amaurosis fugax — Clinical Guidelines

Overview

Amaurosis fugax refers to transient episodes of monocular vision loss lasting seconds to minutes, often indicative of an underlying vascular or embolic condition affecting the retinal arteries 1.

Diagnosis

Sudden, unilateral, transient vision loss (seconds to minutes) 1

Absence of pain or headache typically 1

Fundus examination may be normal between episodes 1

Fluorescein angiography or Doppler studies may reveal vascular abnormalities 1

Electroretinography (ERG) can show reduced or absent responses in chronic forms like Leber's congenital amaurosis 2 4

Management

Identify and treat underlying causes (e.g., carotid artery disease, atrial fibrillation) 1

Antiplatelet agents or anticoagulants as indicated by risk factors 1

No specific drug doses mentioned for amaurosis fugax; manage comorbidities accordingly 1

Genetic counseling and multidisciplinary approach for syndromes like thiamine responsive megaloblastic anemia (TRMA) 2

Special Populations

Pediatrics: Leber's congenital amaurosis associated with TRMA requires comprehensive management including thiamine supplementation, diabetes management, and ophthalmological care 2

Comorbidities: Cases may present with additional systemic issues such as cardiomyopathy, nephronophthisis, and hepatic fibrosis, necessitating integrated care 3 4

Key Recommendations

Evaluate and manage potential vascular risk factors in patients presenting with amaurosis fugax to prevent stroke (Evidence: Moderate 1)

Consider genetic testing and multidisciplinary support for patients with suspected syndromes like TRMA presenting with Leber's congenital amaurosis (Evidence: Weak 2)

Regular ophthalmologic follow-up is essential for monitoring and managing visual decline in special populations with associated systemic conditions (Evidence: Expert opinion 3 4)

References

1 Tsoucalas G, Michaleas SN, Sideris P, Karamanou M. An innovative hippocratic cranial intervention for amaurosis in classical Greece. Acta chirurgica Belgica 2021. link 2 Srikrupa NN, Meenakshi S, Arokiasamy T, Murali K, Soumittra N. Leber's congenital amaurosis as the retinal degenerative phenotype in thiamine responsive megaloblastic anemia: a case report. Ophthalmic genetics 2014. link 3 Singh V, Bhattacharjee S, Singh K, Narula MK. Leber's amaurosis with nephronophthisis and congenital hepatic fibrosis. Indian pediatrics 2004. link 4 Russell-Eggitt IM, Taylor DS, Clayton PT, Garner A, Kriss A, Taylor JF. Leber's congenital amaurosis--a new syndrome with a cardiomyopathy. The British journal of ophthalmology 1989. link

Amaurosis fugax