Type II Diabetes Mellitus

Hyperosmotic hyperglycemic nonketotic (HHNK) state (also known as hyperosmolar hyperglycemic state) is a significant acute complication of type 2 diabetes mellitus, especially for those over 65 years of age. It is characterized by extreme hyperglycemia and hyperosmolarity with little ketosis. The main clinical effect of extreme hyperosmolarity is somnolence or confusion. The absence of severe ketonemia is attributed to residual insulin secretion that is sufficient to restrain lipolysis. HHNK state is marked by extreme dehydration, with both a marked deficit of free water and serious compromise of intravascular volume and tissue perfusion. Most patients with HHNK state have hypotension, extremely dry mucous membranes, and gross elevation of urea nitrogen and creatinine. Urinary tract infection, pneumonia, stroke, myocardial infarction, and sepsis may precipitate HHNK state. Elderly patients are particularly vulnerable because their thirst mechanisms are less sensitive to a rising serum osmolality. Fluid replacement is the most important component of therapy for HHNK state. Restoration of circulating volume is an urgent first priority and is accomplished by relatively rapid intraveno