Abstract
BACKGROUND: Malarial retinopathy refers to a constellation of changes seen in severe or complicated malaria cases. These include: retinal whitening, vessel changes-whitening, tramlining, retinal hemorrhages, and papilledema. There are very few Indian studies on this entity. Since retina can be easily visualized by direct ophthalmoscopy, this study was done to determine prevalence of malarial retinopathy among malaria cases and to determine relationship between malarial retinopathy and severity of the disease.
MATERIALS AND METHODS: The study was done at Indoor and Outdoor Departments of Tropical Medicine, School of Tropical Medicine (STM), Kolkata, with the support of the Department of Ophthalmology, Regional Institute of Ophthalmology (RIO), Medical College, Kolkata. Adult malaria cases, both complicated/severe and uncomplicated, were included. Patients unable or unwilling to cooperate with eye examination, contraindications to tropicamide eye drops (angle closure glaucoma or known allergy to product), severe corneal scarring or cataracts hindering view by ophthalmoscopy, diabetes mellitus, hypertension, intracranial space occupying lesions, epilepsy, alcohol use, chronic renal failure, age > 60 years and any other known ocular/systemic disease that can cause retinopathy changes were excluded. Severe malaria was diagnosed as per the WHO criteria. Cases with acute febrile illness of other causes were taken in control arm, and normal population subjects were taken as controls. All patients were assessed clinically, followed by appropriate laboratory investigations and then direct ophthalmoscopic examination was done. Ocular findings were be collaborated with severity of illness.
RESULTS: A total of 71 malaria cases were included in our study. Among them, 12 cases were of severe malaria, and rest of the cases were uncomplicated. Of the 12 severe malaria cases, 8 were Plasmodium vivax, 3 were Plasmodium falciparum, and 1 was mixed. Uncomplicated malaria cases were mostly P. vivax (35 out of 59). Features suggestive of malarial retinopathy were noted in 9 out of 12 cases of severe malaria (75%) and 2 out of 59 cases of uncomplicated malaria (3.4%). We noted two cases of retinal changes-one case of retinal whitening in falciparum malaria and one case of vivax malaria with retinal hemorrhage in the uncomplicated group. Both of the cases subsequently needed admission for recurrent vomiting, reduced urine output, and severe weakness 40 dengue cases were included in control arm of AFI cases-20 DHF cases and 20 cases of DF with warning signs. Among them, retinal hemorrhage was noted in one case of DHF (2.5%). Out of 40 sepsis cases, retinal hemorrhage was seen in one case (2.5%). No retinal changes were noted among 40 other AFI cases which included scrub typhus, enteric fever, chikungunya, and acute viral hepatitis. Also, no abnormality was detected on ophthalmoscopy in 40 healthy individuals. The presence of retinopathy was suggestive of severe malaria (p < 0.05). We found the sensitivity and specificity of malarial retinopathy as a marker of severe malaria to be 75% and 96.6% with a positive predictive value of 81.8%.
CONCLUSION: Malarial retinopathy may serve as an important clinical biomarker for predicting severe malaria. All clinicians should be appropriately trained in performing direct ophthalmoscopy to detect the retinopathy changes.