This review discusses important aspects of the diagnosis and management of Sjögren's syndrome, covering clinical features, diagnosis and management, and summarizes recent developments in diagnosis, prognostication and treatment.

Background The differential diagnosis of acute shortness of breath in a pregnant woman with COVID-19 is broad. Pregnancy is a ketosis-prone state, which can result in metabolic acidosis and tachypnoea. Methods We describe four pregnant women with COVID-19 and breathlessness where ketoacidosis was found to contribute to symptomatic tachypnoea. Results One patient did not have associated COVID-19 pneumonitis, but presented with severe tachypnoea and metabolic acidosis; three women had pneumonitis and metabolic acidosis. Corrective treatment for the metabolic abnormalities resulted in resolution of the ketoacidosis in all cases. No women had coexistent diabetes. Conclusion This is the first series of COVID-19 in pregnancy complicated by ketoacidosis and symptomatic tachypnoea. Ketoacidosis associated with COVID-19 is an important cause of tachypnoea requiring specific treatment, which should not be overlooked. Potential mechanisms for this are discussed with a framework for interpretation of blood gas results during pregnancy.

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Extreme hyperferritinaemia is associated with a broad differential diagnosis of significant medical conditions, including iron overload, infections, cancer and liver disease. Rare infectious causes were also identified, and this series reports a greater proportion of cases of HLH than has previously reported. Unexplained hyperferritinaemia was associated with significant mortality.