Hyperosmolar Hyperglycemic State (HHNS) typically occurs in which patient population and has what key features?

• A. Younger Type 1 patients with ketosis
• B. Type 2 diabetics with very high glucose and severe dehydration but minimal ketosis
• C. Type 1 diabetics with rapid ketosis
• D. Non-diabetic individuals

Answer: (B)

HHNS is a hyperglycemic emergency seen most often in Type 2 diabetes, typically in older adults. It features extremely high blood glucose with profound dehydration from osmotic diuresis, but only minimal ketosis and little to no acidosis because enough insulin is still present to suppress lipolysis and ketogenesis. The severe hyperglycemia raises serum osmolality, leading to mental status changes and a risk of coma. It’s usually triggered by illness, dehydration, or poor intake. The description in this scenario fits a Type 2 patient with very high glucose and severe dehydration but minimal ketosis, which is characteristic of HHNS and helps distinguish it from diabetic ketoacidosis, which occurs more with Type 1 diabetes and involves significant ketosis and acidosis. Non-diabetic individuals would not display this pattern.