Metabolic acidosis with elevated anion gap and euglycemic ketoacidosis in pregnant and postpartum women with severe Covid-19

Pregnant and postpartum women have a higher risk for developing severe Covid-19 and other clinical and obstetric complications. This study aims to evaluate the frequency of metabolic acidosis with elevated anion gap and describe a case series of euglycemic ketoacidosis (EKA) in pregnant and postpartum women with severe confirmed or suspected Covid-19. Observational retrospective study carried in a reference intensive care unit from May 2020 to June 2022. Cases were confirmed with positive RT-PCR or rapid antigen test. Cases with compatible clinical and radiologic findings were also included. Ketoacidosis was defined as the presence of metabolic acidosis with high anion gap (bicarbonate < 15 mEq/L and AG > 10 mEq/L) and ketonuria (2+ or more in urine test). Statistical analyses were made with R software. Of 101 admissions, 61 (60.4%) presented metabolic acidosis with high anion gap. The median age was 29 years, and most were in the third trimester. Evolution to invasive mechanical ventilation (54.0%) and obstetric complications (78.0%) were frequent. The prevalence of metabolic acidosis with high anion gap and absence of hyperlactatemia was of 43.6% (44/101). Six (5.94%) women met the criteria for EKA. Despite severity, there were no deaths. The prevalence of metabolic acidosis and EKA in pregnant and postpartum women with severe Covid-19 was high. This condition should be routinely, so it can be promptly treated.