Diabetic Ketoacidosis vs Hyperosmolar Hyperglycemic State
Diabetic Ketoacidosis and Hyperosmolar Hyperglycemic State are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Diabetic Ketoacidosis vs Hyperosmolar Hyperglycemic State at a glance
- Diabetic Ketoacidosis: Acute metabolic emergency of insulin deficiency producing hyperglycemia, ketonemia, and anion-gap acidosis.
- Hyperosmolar Hyperglycemic State: Severe hyperglycemia with profound hyperosmolarity and dehydration but minimal ketoacidosis.
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Side-by-side comparison
| Feature | Diabetic Ketoacidosis | Hyperosmolar Hyperglycemic State |
|---|---|---|
| At a glance | Acute metabolic emergency of insulin deficiency producing hyperglycemia, ketonemia, and anion-gap acidosis. | Severe hyperglycemia with profound hyperosmolarity and dehydration but minimal ketoacidosis. |
| Classic presentation | Young T1DM patient with Kussmaul respirations, fruity breath, abdominal pain, and altered sensorium after missing insulin doses.; Polyuria, polydipsia, fatigue progressing over hours to days; Nausea, vomiting, diffuse abdominal pain (mimics surgical abdomen, especially in children); Altered mental status from drowsiness to coma… | Elderly nursing-home resident with insidious mental decline, profound dehydration, glucose >600, no Kussmaul breathing, and no significant ketosis.; Insidious onset over days to weeks (vs hours in DKA); Polyuria, polydipsia, then progressive lethargy as dehydration worsens; Weakness, weight loss, decreased oral intake; Altered mental… |
| Workup / key labs | ADA criteria: glucose >250 mg/dL (or <250 in euglycemic DKA), arterial pH <7.30, bicarbonate <18, anion gap >12, positive serum/urine ketones. Severity: mild (pH 7.25-7.30), moderate (7.00-7.24), severe (<7.00).; POC glucose, then serum glucose (>250 mg/dL; may be normal in euglycemic DKA); VBG or ABG: pH <7.30, HCO3 <18 mEq/L; Anion… | Glucose >600 mg/dL, effective serum osmolarity >320 mOsm/kg, arterial pH >7.30, bicarbonate >18, minimal/absent ketones, and altered mental status. Glucose alone is not sufficient — osmolarity and mental status define HHS.; Glucose >600 mg/dL (often 1000+); Effective serum osmolarity = 2(Na) + glucose/18 >320 mOsm/kg; Serum sodium —… |
| Imaging | CXR if infection suspected; CT head only if focal deficits or persistent altered mentation despite metabolic correction (cerebral edema risk in pediatrics) | CXR for pneumonia; CT head if focal deficits persist after fluid resuscitation or if seizure; CT abdomen/pelvis if abdominal source suspected |
| First-line treatment | IV fluids — 0.9% NaCl 15-20 mL/kg in the first hour, then transition to 0.45% NaCl if corrected serum Na normal/elevated; switch to D5-0.45% NaCl when glucose <200-250 to allow continued insulin infusion; Insulin — IV regular insulin 0.1 unit/kg bolus then 0.1 unit/kg/hr infusion (omit bolus in pediatrics); titrate to lower glucose… | Aggressive IV fluids — 0.9% NaCl 1-1.5 L in the first hour; total deficit 8-12 L replaced over 24-48 hours; Switch to 0.45% NaCl if corrected serum Na is normal/elevated and patient is hemodynamically stable; goal to lower osmolarity gradually (no faster than 3 mOsm/kg/hr); Add D5 when glucose <300 to allow continued insulin without… |
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