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Clinical aspects of malarial retinopathy: a critical review

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PATHOGENS AND GLOBAL HEALTH
卷 117, 期 5, 页码 450-461

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TAYLOR & FRANCIS LTD
DOI: 10.1080/20477724.2022.2128568

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Cerebral malaria; malarial retinopathy; retina; fundoscopy; macular whitening; vessel discoloration

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The discovery of malarial retinopathy is important for accurately diagnosing cerebral malaria. However, the lack of recognition by the World Health Organization has led to significant false-positive diagnoses. Raising awareness of malarial retinopathy can improve the accuracy of cerebral malaria diagnosis.
This review will provide a better understanding of a set of signs known as malarial retinopathy. The discovery of this retinopathy in association with cerebral malaria is important because it best distinguishes patients with true cerebral malaria from those with coma due to other causes and incidental Plasmodium falciparum parasitemia. Identifying a comatose patient with malarial retinopathy increases the likelihood of an accurate severe or cerebral malaria diagnosis. As the World Health Organization does not specify that malarial retinopathy is one of the factors included in determining a cerebral malaria diagnosis, there are significant false-positive diagnoses of cerebral malaria. Once a cerebral malaria diagnosis is assigned, other possibilities and treatments are often excluded making an incorrect diagnosis of cerebral malaria potentially fatal. However, Plasmodium falciparum may also contribute to coma in some children with retinopathy-negative cerebral malaria, as this group is still not clinically well characterized, so all children with the WHO definition of cerebral malaria should be treated for severe malaria. Nevertheless, by raising awareness about malarial retinopathy, there could be a greater potential to accurately diagnose cerebral malaria and thus achieve more positive patient outcomes in the future. This literary review aims to raise awareness of the retinopathy by defining what it is to non-experts, explaining its pathology, clarifying the techniques needed to accurately diagnose malarial retinopathy, as well as the barriers that prevent clinicians from providing a proper diagnosis in malaria-endemic regions; and finally, discuss future directions to continue the study of malarial retinopathy.

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