Chapter 41

Acute Metabolic Complications of Diabetes

Diabetic Ketoacidosis and the Hyperosmolar Hyperglycaemic State in Adults

Philip Newland-Jones

Philip Newland-Jones

University Hospital Southampton NHS Foundation Trust, Southampton, UK

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Mayank Patel

Mayank Patel

University Hospital Southampton NHS Foundation Trust, Southampton, UK

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Ketan Dhatariya

Ketan Dhatariya

Norfolk and Norwich University Hospitals NHS Foundation Trust and University of East Anglia, Norwich, UK

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First published: 12 January 2024

Summary

Diabetic ketoacidosis (DKA) and hyperosmolar hyperglycaemic state (HHS) are life-threatening emergencies in diabetes. Both are characterized by hyperglycaemia with insulinopaenia, with only the degree of hyperglycaemia, level of associated dehydration, and severity of the associated metabolic acidosis distinguishing them. This chapter reviews the pathogenesis and pathophysiology, precipitating factors, clinical presentation, management, complications, and prevention of DKA and HHS. Although the mechanisms for the development of DKA are multifactorial, there is always an undercurrent of absolute or relative insulin deficiency, often with a concomitant increase in counter-regulatory hormones. Insulin administration is an essential element of DKA management, as it both increases peripheral glucose utilization and decreases hepatic glucose output. Moreover, it inhibits the release of free fatty acid from adipose tissue and decreases ketogenesis. Improved education around awareness and risk factors for developing HHS are key to reducing future risk.

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