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Concept
Hyperosmolar hyperglycemic state
Summary
Hyperosmolar hyperglycemic state (HHS), also known as hyperosmolar non-ketotic state (HONK), is a complication of diabetes mellitus in which high blood sugar results in high osmolarity without significant ketoacidosis. Symptoms include signs of dehydration, weakness, leg cramps, vision problems, and an altered level of consciousness. Onset is typically over days to weeks. Complications may include seizures, disseminated intravascular coagulopathy, mesenteric artery occlusion, or rhabdomyolysis.
The main risk factor is a history of diabetes mellitus type 2. Occasionally it may occur in those without a prior history of diabetes or those with diabetes mellitus type 1. Triggers include infections, stroke, trauma, certain medications, and heart attacks. Diagnosis is based on blood tests finding a blood sugar greater than 30 mmol/L (600 mg/dL), osmolarity greater than 320 mOsm/kg, and a pH above 7.3.
Initial treatment generally consists of intravenous fluids to manage dehydration, intravenous insulin in those with significant ketones, low molecular weight heparin to decrease the risk of blood clotting, and antibiotics among those in whom there are concerns of infection. The goal is a slow decline in blood sugar levels. Potassium replacement is often required as the metabolic problems are corrected. Efforts to prevent diabetic foot ulcers are also important. It typically takes a few days for the person to return to baseline.
While the exact frequency of the condition is unknown, it is relatively common. Older people are most commonly affected. The risk of death among those affected is about 15%. It was first described in the 1880s.
Symptoms of high blood sugar including increased thirst (polydipsia), increased volume of urination (polyuria), and increased hunger (polyphagia).
Symptoms of HHS include:
Altered level of consciousness
Neurologic signs including: blurred vision, headaches, focal seizures, myoclonic jerking, reversible paralysis
Motor abnormalities including flaccidity, depressed reflexes, tremors or fasciculations
Hyperviscosity and increased risk of blood clot formation
Dehydration
Weight loss
Nausea, vomiting, and abdominal pain
Weakness
Low blood pressure with standing
The main risk factor is a history of diabetes mellitus type 2.
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