Background: Various risk factors have been proposed for severe coronavirus disease 2019 (COVID-19); nonetheless, the prognostic role of serum electrolytes has not been widely studied. Objectives: The present study aimed to identify the potential prognostic role of electrolyte imbalance in hospitalized COVID-19 patients. Methods: This retrospective study was conducted in Imam Reza Hospital, Mashhad, Iran. The medical records of all COVID-19 patients admitted to the emergency department from May to August 2020 were evaluated. Demographic data and clinical findings upon admission were collected. Disease severity, lung involvement severity on imaging, inflammatory serum biomarkers, admission to the intensive care unit, and serum levels of sodium, potassium, magnesium, calcium (corrected by serum albumin level), and phosphorus were documented. Results: Most patients (60%) were male, and the mean age of the total population was 58.87 ± 1.82 years. Severe COVID-19 was detected in most cases (94.9%) who were significantly older (P = 0.037), had hypertension (P = 0.032), ischemic heart disease (P = 0.033), and higher serum urea (P = 0.001) and serum potassium (P < 0.001). Patients with poor prognosis based on computed tomography (CT) scores had significantly higher serum urea (P = 0.002) and magnesium (P = 0.035) than patients with good prognosis, while serum calcium was significantly higher in the latter group (P = 0.007). Furthermore, there was a significant relationship between COVID-19 severity and serum potassium (P < 0.001). Conclusions: Abnormal serum electrolytes are correlated with COVID-19 severity. Moreover, serum potassium level is a predictor of severe disease.
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