Systemic and Laboratory Risk Factors for Retinopathy and Detection of Tear Film SARS-CoV-2 RNA

ABSTRACT

Purpose: Coronavirus-19 (COVID-19) has been associated with ophthalmic manifestations. The relationship between tear film SARS-CoV-2 RNA, timing of illness and eye disease are unknown. We evaluated hospitalized COVID-19 inpatients for retinopathy and tear film viral RNA. Methods: Hospitalized COVID-19 inpatients were offered enrollment from January-June 2021. Full dilated ophthalmic examination and conjunctival swabs were taken for triplex RT-PCR for SARS-CoV-2 RNA targeting N2, E and RNAse P. Demographic, clinical outcomes and laboratory data were collected. Univariate and multivariate analyses of systemic disease and laboratory risk factors for retinopathy and SARS-CoV-2 RNA detection were assessed. Results: Sixty patients were prospectively enrolled in this cross-sectional, observational study. The mean age was 58.8 years (Standard deviation [SD] 15.2 years) and 29 (48%) were female. Retinopathy associated with COVID-19 in 12 of 60 patients (20%). Univariate analyses revealed that younger age, greater body mass index (BMI) and extracorporeal membrane (ECMO) requirement were associated with increased odds of COVID-19 retinopathy. The mean age (SD) of patients with COVID-19 retinopathy was 49.0. (11.6) compared to 61.2 (15.1) years in individuals without retinopathy (p=0.01). The mean BMI was 38.8 (9.8) in patients with retinopathy compared to 31.8 (9.0) in those without retinal disease findings (p=0.04). ECMO requirement was observed in 33% of patients with retinopathy compared to 8% in those without retinopathy (p=0.04). Multivariate analyses trended towards increased risk of retinopathy with younger age (aOR 0.95 (95% CI 0.90- 1.01, p=0.095) and with increased BMI (aOR. 1.08, 95% CI 1.00-1.18, p=0.056). Fifteen of 60 patients (25%) tested positive in their tear film for SARS-CoV-2 RNA with a trend towards a shorter length of illness and hospitalization in patients who were positive. The N2 gene was particularly sensitive with 18 of 19 eyes (94.7%) showing N2-positivity (with or without E gene detection), including 2 patients in whom the B.117 / B.1.525 alpha or ?United Kingdom? variant was detected. Conclusions: A 20% rate of retinopathy was observed and SARS-CoV-2 RNA within tear film was detected in 25% of hospitalized COVID-19 patients. Continued infection control precautions are required given the risk of viral RNA in tear film, which may also be sensitive for the detection of COVID-19 variants.