Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

HHS · Hyperosmolar Hyperglycemic State

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In one line

·Blood sugar shoots above 600 mg/dL, blood turns thick like syrup, and the brain gets confused — but no big acid buildup like in DKA.

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Normal physiology

·The pancreas releases insulin, a hormone that unlocks cells so sugar (glucose) can move from the bloodstream into muscle, fat, and liver cells for energy or storage. At the same time, the kidneys filter blood and normally reabsorb every bit of glucose back into the body — none is wasted in urine. This keeps blood sugar steady between 70 and 100 mg/dL, even after meals.

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What goes wrong

·In type 2 diabetes, cells become resistant to insulin — the key still turns, but the lock is sticky, so less sugar gets inside. The pancreas tries to compensate by making more insulin, but over time it wears out and insulin levels drop. When a stressor hits (infection, heart attack, stroke, or stopping diabetes medicine), the body releases stress hormones like cortisol and epinephrine that push blood sugar even higher and block insulin further. Sugar climbs above 600 mg/dL. The kidneys try to dump the excess into urine, but sugar drags water with it by osmosis (water follows sugar), so the person urinates gallons and becomes severely dehydrated. Blood volume shrinks, blood thickens, and the kidneys — now low on blood flow — can no longer filter effectively, so sugar stays trapped in the blood, climbing higher still.

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Hallmark signs

·Extreme thirst and dry mouth
·Peeing much more than usual
·Severe dehydration—dry skin, sunken eyes, fast heart rate
·Confusion, drowsiness, or trouble waking up
·Weakness and fatigue
·Warm, flushed skin with no sweating
·Nausea or belly pain
·Vision changes or blurry sight

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Red flags · escalate now

·Confusion, extreme drowsiness, or can't be woken up—the brain is shutting down from dehydration and sky-high sugar; this can lead to coma and death without emergency treatment.
·Blood pressure dropping or heart racing over 120 beats per minute at rest—the blood volume is dangerously low and the heart is struggling to keep organs alive.
·Seizure or one-sided weakness—severe dehydration and thick blood can trigger a stroke or seizure, especially in older adults.

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Workup

·Serum glucose
·Serum osmolality (calculated or measured)
·Serum sodium (Na⁺)
·Serum potassium (K⁺)
·Arterial or venous blood gas (pH and bicarbonate)
·Serum or urine ketones
·Blood urea nitrogen (BUN) and creatinine
·Workup for the trigger: urinalysis and culture, chest X-ray, ECG, cardiac enzymes

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Treatment

·IV fluids: Start with 0.9% normal saline 1–1.5 L in the first hour, then 250–500 mL/h; switch to 0.45% half-normal saline once serum sodium is normal or high and blood pressure is stable
·Check potassium before starting insulin; if K⁺ < 3.3 mEq/L, hold insulin and give IV potassium (20–30 mEq/h) until K⁺ is ≥ 3.3; maintain K⁺ at 4–5 mEq/L during treatment
·IV insulin: Start regular insulin infusion at 0.1 units/kg/h (or 0.14 units/kg/h without a bolus) AFTER fluids have started and potassium is ≥ 3.3; aim to lower glucose by 50–70 mg/dL per hour
·Add 5% dextrose to IV fluids once glucose reaches 250–300 mg/dL, and continue insulin to normalize osmolality and mental status
·Find and treat the trigger: antibiotics for infection (UTI, pneumonia, sepsis), aspirin and cardiac catheterization for MI, adjust or restart home insulin if doses were missed
·Monitor glucose, sodium, potassium, and osmolality every 1–2 hours initially, then every 2–4 hours; track mental status and urine output closely
·Transition to subcutaneous insulin once glucose is < 250 mg/dL, mental status is normal, the person can eat and drink, and the trigger is controlled; overlap SC and IV insulin by 1–2 hours to avoid rebound high blood sugar (hyperglycemia)

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NCLEX trap

·Give IV fluids FIRST. Hyperosmolar hyperglycemic state is a water-loss emergency. The blood has become thick like syrup because the body has lost huge amounts of water through the kidneys. Fluids thin the blood back out. Insulin comes second, after you check that potassium is safe. If you give insulin before fluids, water rushes into brain cells too fast and the brain swells — that can kill.
·Hyperosmolar hyperglycemic state (HHS) and diabetic ketoacidosis (the acid crisis of missing insulin) (DKA) are different emergencies. In HHS, there is almost no acid in the blood — pH stays near normal. In DKA, the blood is very acidic because the body is burning fat for fuel and making acid waste called ketones. HHS usually happens in older adults with type 2 diabetes who still make a little insulin — enough to stop fat burning but not enough to control sugar. DKA happens in younger people with type 1 diabetes who make zero insulin. The upstream breaks are different, so the fixes are different.
·Bring blood sugar down SLOWLY in hyperosmolar hyperglycemic state — aim for sugar to drop about 50–70 points per hour, landing at 250–300 first, not all the way to normal. Fast drops pull water out of brain cells too quickly and the brain swells (called cerebral swelling (edema)). The confusion will get better as fluids soak into the blood and the blood gets less thick — you do not need to chase the sugar number down to see improvement.
·Hyperosmolar hyperglycemic state CAN have small amounts of ketones and mild acid — but nothing like the severe too much acid in the blood (acidosis) in DKA. The key to diagnosing HHS is blood sugar over 600, severe water loss (dehydration), thick blood (high serum osmolality, usually over 320), and little or no too much acid in the blood (pH above 7.30, bicarbonate above 15). Osmolality — a measure of how concentrated the blood is — is the real number that defines HHS.
·Confusion in hyperosmolar hyperglycemic state comes from thick blood starving the brain of oxygen and glucose it can use — not from permanent brain damage. You MUST find the trigger that kicked off the HHS: infection (like pneumonia or a urinary tract infection), heart attack, stroke, missed insulin doses, or a new medicine (like steroids). Treat the trigger or the HHS will come back. Never assume confusion in an older diabetic is 'just old age.'
·Always check potassium BEFORE you start insulin in hyperosmolar hyperglycemic state. Even if potassium looks normal or high at first, insulin pushes potassium out of the blood and into cells. If potassium is already low (below 3.3), insulin will drop it even more and the heart can stop (cardiac arrest). If potassium is below 3.3, give potassium first and wait for the level to come up before starting insulin. The order saves lives.

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