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Diabetes mellitus affects an estimated 11 million people in the US and over 100 million worldwide. Approximately 90% of these patients have type 2 or non-insulin-dependent diabetes. The remainder are classified as type 1 or insulin-dependent diabetics.
Diabetes is characterized by chronic hyperglycemia that often requires lifelong treatment. Untreated, chronic hyperglycemia eventually leads to both micro- and macrovascular complications affecting virtually every organ system. As a result, diabetics frequently present to the emergency department (ED) with complications such as severe infections, myocardial infarction (MI), stroke, renal disease, and lower extremity ischemia and skin ulcerations.
This chapter focuses on the diagnosis and management of acute metabolic derangements frequently encountered in diabetic patients. These consist of diabetic ketoacidosis (DKA), hyperglycemic hyperosmolar state (HHS), and hypoglycemia.
DKA is a potentially life-threatening medical emergency. It occurs predominantly in type 1 diabetics and accounts for the initial presentation of glucose-related problems in about 25% of diabetics. Despite advances in treatment, the mortality rate for this condition remains 2–4%.
DKA is a syndrome characterized by hyperglycemia, ketonemia, and metabolic acidosis caused by either relative or absolute insulin deficiency. The treatment consists of fluid and electrolyte replacement, together with continuous low-dose insulin infusion.
Precipitating causes for DKA include infection, MI, trauma, pregnancy, or stress. In many cases, there isn't an intercurrent disease process, and noncompliance with insulin therapy is recognized as a significant precipitant of DKA. Errors of insulin dosage may occasionally be a contributing factor.
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