Purpose: Little is known on the mortality rate in COVID-19 related acute metabolic emergencies, namely diabetic ketoacidosis (DKA), hyperglycaemic hyperosmolar state (HHS), combined DKA/HHS, and euglycaemic diabetic ketoacidosis (EDKA). Methods: A systematic literature review was conducted using EMBASE, PubMed/Medline, and Google Scholar from January 1, 2020 to January 9, 2021 to identify all case report series, cross-sectional studies, and meta-analyses of case reports describing mortality

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... in DKA, HHS, and EDKA, in COVID-19 patients. The Joanna Briggs Institute critical appraisal checklist for case reports was used for quality assessment. Results: From 313 identified publications, 4 fulfilled the inclusion criteria and analyzed qualitatively and quantitatively. A systematic review and meta-analysis with subgroup analyses examined mortality rate in a total of 152 COVID-19 patients who had developed DKA, HHS, combined DKA/HHS, or EDKA. Combined mortality rate and confidence intervals (CI) were estimated using random effects model. The study was registered to PROSPERO database (ID: 230737). Results: Combined mortality rate was found to be 27.1% [95% CI: 11.2-46.9%]. Heterogeneity was considerable (I2=83%; 95% CI: 56-93%), corrected to 67% according to Von Hippel adjustment for small meta-analyses. Funnel plot presented no apparent asymmetry; Eggers and Beggs test yielded in P=0.44 and P=0.50, respectively. Sensitivity analysis failed to explain heterogeneity. Conclusion: COVID-19 related acute metabolic emergencies (DKA, HHS, and EDKA) are characterized by considerable mortality; thus, clinicians should be aware of timely detection and immediate treatment commencing.