Compare two conditions

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

Diabetic Ketoacidosis

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In one line

·No insulin → sugar cannot enter cells → body burns fat for fuel → fat breakdown creates acids (ketones) that make the blood acidic.

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Normal physiology

·The pancreas (an organ behind your stomach) makes insulin. Insulin is the key that opens the door on every cell so sugar (glucose) can get inside. Sugar inside the cells fuels the whole body — the brain, the muscles, the heart, everything. When you eat and blood sugar rises, the pancreas releases insulin. When blood sugar drops, insulin drops. The body keeps blood sugar in a tight, safe window all day and night.

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What goes wrong

·Insulin is missing or almost missing. Either the pancreas (in type 1 diabetes) does not make any insulin, or a big stress like an infection, missed doses, or sickness makes the insulin the body has stop working well enough. Sugar cannot get into cells. The body panics and thinks it is starving, even though the blood is flooded with sugar.

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Hallmark signs

·Extreme thirst
·Peeing constantly (polyuria)
·Nausea and vomiting
·Belly pain
·Deep, fast breathing (Kussmaul breathing)
·Fruity or acetone breath
·Confusion, drowsiness, or hard to wake
·Weakness and fatigue

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Red flags · escalate now

·Breathing slowing down or becoming shallow in a patient who is still acidotic—the respiratory muscles are tiring out and respiratory arrest may be next
·Sudden severe headache, worsening confusion, vomiting, or decline in mental status during treatment (especially in children under 18)—warns of cerebral swelling (edema), brain swelling that can be fatal
·Blood sugar dropping quickly but the anion gap still wide and bicarbonate still low—ketoacid is still being made or not cleared, do not stop insulin even if glucose is normal
·Chest pain, new trouble breathing, troponin elevation, or signs of heart failure—a heart attack or severe infection may have triggered the DKA and needs urgent treatment alongside DKA care
·Blood pressure staying low or dropping despite fluid—suggests septic shock, cardiogenic shock, or severe volume depletion; needs immediate ICU-level support

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Workup

·Blood sugar (glucose) — fingerstick and lab draw from a vein
·Venous or arterial blood gas — pH, bicarbonate (HCO₃), and carbon dioxide (pCO₂)
·Anion gap (calculated from sodium, chloride, and bicarbonate)
·Beta-hydroxybutyrate (blood ketone level)
·Basic metabolic panel (BMP) — sodium, potassium, chloride, bicarbonate, BUN, creatinine, glucose
·Urinalysis — ketones, sugar, white blood cells, nitrites, bacteria
·EKG (electrocardiogram — heart tracing)
·Infection and trigger work-up — chest X-ray, blood cultures, urinalysis, troponin, lipase, pregnancy test

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Treatment

·IV fluids — normal saline (0.9% NaCl), 1 to 2 liters in the first hour, then 250 to 500 mL per hour
·Check potassium before starting insulin. If potassium is under 3.3 mEq/L, give potassium chloride (20 to 40 mEq) through the IV over 1 to 2 hours before starting insulin.
·IV insulin — regular insulin drip at 0.1 units per kilogram per hour (or 0.14 units/kg bolus, then 0.1 units/kg/hour infusion). Start after fluids are running and potassium is safe.
·Add dextrose (sugar) to the IV fluids when blood sugar drops below 200 to 250 mg/dL. Use 5% dextrose in half-normal saline (D5 1/2 NS) or 10% dextrose if sugar keeps dropping.
·Treat the trigger — antibiotics for infection (e.g. ceftriaxone for pneumonia or UTI), aspirin and catheterization for heart attack, insulin education and social work for missed doses, etc.
·Bicarbonate (sodium bicarbonate 100 mEq in 400 mL sterile water, given over 2 hours) — only if pH is under 6.9
·Transition to subcutaneous (under-the-skin) insulin when DKA is resolved: pH over 7.3, bicarbonate over 18 mEq/L, anion gap under 12, and patient can eat. Give long-acting insulin (e.g. glargine or detemir) 2 hours before stopping the drip, or give rapid-acting insulin (e.g. lispro or aspart) with a meal 30 minutes before stopping the drip.

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NCLEX trap

·Always start fluids FIRST. Check the potassium level before you give any insulin. If potassium is below 3.3, replace it until it reaches at least 3.3, then start the insulin drip. Insulin forces potassium into cells, which drops the blood level dangerously low and can stop the heart.
·Keep the insulin drip running until the acid clears from the blood—that means the anion gap closes and the pH comes back up. When blood sugar falls below 200, add dextrose (sugar) to the IV fluids so the patient does not go hypoglycemic. You need insulin to clear the ketones (the acids), not just to lower sugar.
·Only give bicarbonate if the blood pH is below 6.9 AND the patient has dangerous heart rhythm problems or severe shock that is not getting better with fluids. Using bicarbonate when it is not needed makes outcomes worse and raises the risk of cerebral swelling (edema) (brain swelling), especially in children.
·The total body potassium is ALWAYS low in DKA, even when the blood test looks normal or high. This is because acid in the blood pushes potassium out of cells into the bloodstream. Once you start insulin and fluids, potassium rushes back into cells and the blood level drops fast. If it drops below 3.3, the heart can stop. Replace potassium in every patient unless the level is above 5.2.
·DKA is a life-threatening emergency. Subcutaneous insulin is absorbed too slowly and unpredictably, especially when the patient is dehydrated and in shock. You must use IV regular insulin as a continuous drip so you can control the rate closely and adjust it quickly.

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