There are multiple mechanisms by which The Coronavirus-19 (COVID-19) infection can cause electrolyte abnormalities, which may not be the case for bacterial causes of pneumonia. This study aimed to assess the differences in electrolyte levels between patients suffering from COVID-19 and bacterial pneumonia. This is an original, retrospective study. Two cohorts of hospitalized patients were included, 1 suffering from COVID-19 and the other from bacterial pneumonia. Their day 1 and day 3 levels of sodium, potassium, magnesium, and phosphorus, as well as their outcomes, were extracted from the charts. Statistical analysis was subsequently performed. Mean admission levels of sodium, potassium, phosphorus, and magnesium were 135.64 ± 6.13, 4.38 ± 0.69, 3.53 ± 0.69, and 2.03 ± 0.51, respectively. The mean day 3 levels of these electrolytes were 138.3 ± 5.06, 4.18 ± 0.59, 3.578 ± 0.59, and 2.11 ± 0.64, respectively. Patients suffering from bacterial pneumonia were significantly older (N = 219, mean = 64.88 ± 15.99) than patients with COVID-19 pneumonia (N = 240, mean = 57.63 ± 17.87). Bacterial pneumonia group had significantly higher serum potassium (N = 211, mean = 4.51 ± 0.76), and magnesium (N = 115, mean = 2.12 ± 0.60) levels compared to COVID-19 group (N = 227, mean = 4.254 ± 0.60 for potassium and N = 118, mean = 1.933 ± 0.38 for magnesium). Only magnesium was significantly higher among day 3 electrolytes in the bacterial pneumonia group. No significant association between electrolyte levels and outcomes was seen. We found that COVID-19 patients had lower potassium and magnesium levels on admission, possibly due to the effect of COVID-19 on the renin-angiotensin-aldosterone system as well as patient characteristics and management. We did not find enough evidence to recommend using electrolyte levels as a determinator of prognosis, but more research is needed.
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