hyperosmolar hyperglycemic state

The hyperosmolar hyperglycemic state is what happens when blood sugar climbs to extreme heights and the body slowly dries out from the inside. So much glucose spills into the urine that it drags water with it day after day, until the blood becomes thick and concentrated — like seawater too salty to sustain the cells bathed in it.

HHS is a serious acute complication, mainly of type 2 diabetes, defined by very severe hyperglycemia (often above 33 mmol/L, or 600 mg/dL), profound dehydration, and high blood osmolality, but with little or no ketoacidosis. The key difference from DKA is that enough residual insulin remains to suppress fat breakdown and ketone formation, so the crisis is dominated by osmotic water loss rather than acidosis.

It develops gradually over days, often in older people with type 2 diabetes precipitated by infection, illness, or inability to drink enough fluids, and carries a higher mortality than DKA. The dominant features are extreme dehydration and altered mental status — drowsiness, confusion, even coma — sometimes with seizures. Treatment centers on aggressive but careful fluid replacement, insulin, and electrolyte correction, alongside treating the underlying trigger.