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Endocrine

Diabetic Ketoacidosis

DKA High-yield Verified · Sep 2026

Diabetic ketoacidosis is a serious, potentially life-threatening complication of diabetes defined by the triad of hyperglycemia, ketonemia, and metabolic acidosis — most often in type 1 diabetes, but it occurs in type 2 as well.

The highest-yield endocrine emergency: one broken hormone explains the hyperglycemia, the acidosis, the breathing pattern, and the potassium paradox — and the order you fix them in is the whole test.

What’s going wrong in the body

The normal physiology, where it fails, and why the body’s compensation backfires.

01 No insulin — glucose everywhere, usable nowhere

DKA begins with an absolute (or relative) insulin deficiency plus a surge of counterregulatory hormones — a falling insulin-to-glucagon ratio. The liver responds as if the body were starving: gluconeogenesis rises, glycogenolysis accelerates, and peripheral tissues, lacking insulin, can’t take glucose up. Sugar floods the blood while the cells go hungry.

All that glucose spills into the urine and drags water with it — osmotic diuresis. The patient urinates constantly, drinks constantly, and still dehydrates; the fluid deficit can reach 10–15% of body weight, with electrolytes washing out alongside the water. This is why DKA is a volume emergency before it is a glucose emergency.

One caveat worth knowing: glucose is the least reliable leg of the triad. In euglycemic DKA the glucose is below 250 mg/dL yet the ketoacidosis is real — a subtype that has grown with SGLT2 inhibitors and also appears with pregnancy, fasting or carbohydrate restriction, surgery, infection, and alcohol use disorder. Its treatment twist: dextrose 5% goes into the fluids from the start.

02 Fat becomes acid — the cascade that names the disease

With no insulin to oppose them, the counterregulatory hormones unlock adipose tissue: free fatty acids pour out (lipolysis) and the liver oxidizes them without restraint into ketone bodies — β-hydroxybutyrate and acetoacetate, with acetone as a breakdown product of acetoacetate. Ketoacids accumulate faster than the body can buffer them: ketonemia becomes an anion-gap metabolic acidosis.

The lungs try to compensate. Kussmaul breathing — deep, rapid respirations blowing off CO₂ — is the respiratory answer to metabolic acidosis, and the breath carries a fruity odor because acetone is volatile and leaves through the lungs. A student sees “respiratory distress”; the nurse recognizes compensation, and reads the acid–base story off the patient’s breathing pattern from the doorway.

One deficiency, two cascades: unusable glucose drives osmotic dehydration while unrestrained fat breakdown drives ketoacid production and the anion-gap acidosis.

03 The potassium paradox — the lab that lies

Acidosis and insulin deficiency push potassium out of cells and into the serum, so the admission K⁺ is usually normal or even elevated. But the osmotic diuresis has been flushing potassium into the toilet for days: total-body potassium is depleted — roughly 3–6 mmol/kg — no matter what the first lab says. The serum value is a snapshot of where the potassium is, not how much the body has.

This paradox is why the treatment sequence is unforgiving. The moment insulin starts, it drives potassium back into cells, and a “normal” serum K⁺ can plummet to arrhythmia territory within hours. Hypokalemia is the most common complication after insulin is started — which is exactly why potassium is checked, and if needed replaced, before the infusion begins.

The potassium paradox: shifts inflate the serum number while the total-body store is depleted — then insulin reverses the shift and the serum level can crash.

04 Reversing it — in exactly this order

Treatment mirrors the pathophysiology in reverse, and the sequence is the teaching. Fluids first: isotonic 0.9% NaCl at roughly 15–20 mL/kg in the first hour (500–1000 mL/h for the first 2–4 hours) begins refilling a tank that is 10–15% empty. Then check the potassium before any insulin: if K⁺ is below 3.5 mmol/L, insulin is held and potassium replaced first, because insulin would drive an already-depleted K⁺ dangerously lower. Only then does the continuous IV infusion of regular insulin at 0.1 U/kg/h start — shutting off gluconeogenesis and, critically, the lipolysis-to-ketone cascade that is producing the acid.

Glucose normalizes before ketone production stops — and this is where treatment is most often fumbled. When glucose falls to about 200–250 mg/dL, the answer is not to stop the insulin; it is to add dextrose 5–10% to the fluids and reduce the insulin to 0.05 U/kg/h, so the infusion can keep running until the ketoacidosis itself resolves — plasma β-hydroxybutyrate < 0.6 mmol/L with pH ≥ 7.3 or bicarbonate ≥ 18 mmol/L. Even the exit has an overlap rule: subcutaneous basal insulin is given 1–2 hours before the drip stops, so there is never a moment without insulin coverage. Bicarbonate, for all its intuitive appeal, is not routine — the 2024 consensus reserves it for a pH below 7.0.

The DKA treatment sequence (ADA/EASD 2024): fluids, then the potassium decision, then insulin, then dextrose — and the infusion never stops until the ketoacidosis resolves.

Causes & risk factors

Modifiable factors are teaching targets — the patient can act on them.

Infection — the most common precipitant globally (14–58%; pneumonia and UTI most cited) Insulin omission / nonadherence (13–60% of cases) modifiable New-onset (previously undiagnosed) diabetes (6–23%) Insulin-pump problems — a clogged pump or a pump-management error modifiable SGLT2 inhibitors (euglycemic DKA; ≈ 7-fold relative risk in type 2 diabetes) Myocardial infarction or stroke Pancreatitis Pulmonary embolism Trauma or surgery Alcohol or substance use modifiable Pregnancy, fasting, or strict carbohydrate restriction (euglycemic-DKA triggers)

Signs & symptoms

Each finding tied to the mechanism that produces it — and the triage it calls for.

Polyuria — urinating far more than usual early Expected
Why: Glucose spilling into the urine drags water with it — the osmotic diuresis that drains up to 10–15% of body weight.
Polydipsia — being very thirsty early Expected
Why: The body’s answer to osmotic water loss; the patient drinks constantly and still falls behind the diuresis.
Fruity-smelling breath early
Why: Acetone — a breakdown product of the ketone acetoacetate — is volatile and leaves through the lungs. Smellable evidence of ketonemia.
Kussmaul respirations — deep, rapid breathing late Expected
Why: Respiratory compensation for the metabolic acidosis: the lungs blow off CO₂ to raise pH. Read it as acid–base physiology, not a primary lung problem.
Dry skin and mouth, flushed face late Expected
Why: The visible face of dehydration as GI and renal fluid losses mount.
Nausea, vomiting & abdominal pain late Hold & notify
Why: Classic later features — and vomiting compounds the GI fluid and electrolyte losses that are already driving hypovolemia.
Headache & muscle aches late
Why: Later systemic features of the acidosis and dehydration — and a new headache during treatment carries a different, darker meaning (see cerebral edema below).
Decreased alertness — drowsy, hard to rouse late Hold & notify
Why: Osmolar stress and dehydration dulling the brain; mentation tracks severity (alert in mild DKA, stupor or coma in severe).
Altered mental status or unresponsiveness late Report immediately
Why: A report-and-act-immediately finding — severe DKA, or cerebral edema declaring itself.
Dyspnea / respiratory distress Report immediately
Why: Breathing difficulty beyond compensatory Kussmaul breathing is an emergency-care trigger, not something to watch.
Abnormal vital signs Report immediately
Why: Hypovolemia from combined GI and renal losses destabilizes the circulation — report immediately.

Diagnostics

Test In this disorder Normal
Blood glucose Older criteria taught > 250 mg/dL, and it still appears on exams. Glucose can be < 250 in euglycemic DKA (think SGLT2 inhibitors) — never rule DKA out on glucose alone ≥ 200 mg/dL (11.1 mmol/L) — or any glucose with a known history of diabetes ADA/EASD 2024 —
β-hydroxybutyrate (blood ketones) Blood β-hydroxybutyrate is preferred over urine nitroprusside testing; resolution target is < 0.6 mmol/L — the number that finally lets the insulin drip stop ≥ 3.0 mmol/L (or urine ketones ≥ 2+) ADA/EASD 2024 —
pH (ABG/VBG) Severity travels with mentation: alert in mild, drowsy in moderate, stupor/coma in severe. pH < 7.0 is also the only threshold at which bicarbonate is considered < 7.30 · severity: mild > 7.25 · moderate 7.0–7.25 · severe < 7.0 ADA/EASD 2024 —
Serum bicarbonate The classic cutoff of < 15 mEq/L still circulates in older materials; the 2024 consensus criterion is < 18 < 18 mmol/L · severity: 15–18 mild · 10 to < 15 moderate · < 10 severe ADA/EASD 2024 —
Anion gap The gap is the ketoacid load. Watching it close is watching the DKA resolve — the classic resolution set used gap ≤ 12 as a criterion Elevated — > 14–15 mEq/L StatPearls ≈ 12 mEq/L (reference)
Serum potassium The most important lab of the sequence: check it before insulin, and if < 3.5 mmol/L, hold insulin and replace potassium first Usually normal or elevated at presentation — despite a total-body deficit of 3–6 mmol/kg ADA/EASD 2024 —

Complications

Warning: Hypokalemia once insulin starts — the most common treatment complication Hold & notify
Insulin drives potassium into cells, unmasking the total-body deficit: risk of cardiac arrhythmias and arrest. Severe hypokalemia (≤ 2.5 mmol/L) carries a threefold mortality increase.
The prevention is the sequence itself: verify K⁺ ≥ 3.5 before insulin, add 20–30 mEq per litre of fluid when K⁺ is 3.5–5.0 (target 4–5 mmol/L), confirm urine output before replacing, and keep the patient on a cardiac monitor with electrolytes every 2 hours.
Warning: Hypoglycemia during treatment Hold & notify
An estimated 5–25% of patients drop low during therapy — risking seizures and arrhythmias — because glucose normalizes hours before the ketoacidosis does.
This is what the dextrose step is for: at glucose ≈ 200–250 mg/dL, add dextrose 5–10% and reduce the insulin to 0.05 U/kg/h — never stop it. Hourly glucose checks are the safety net.
Warning: Cerebral edema — the most important cause of DKA mortality Report immediately
Usually in younger patients; develops in 0.3–0.9% of pediatric DKA with 21–24% mortality. Risk factors: severe acidosis, severe dehydration, markedly elevated BUN.
Warning signs during treatment: new headache, recurrent vomiting, altered mental status, urinary incontinence, Cushing triad (bradycardia, irregular respirations, hypertension). Treatment is mannitol 0.5–1 g/kg IV or 3% saline — and pediatric protocols omit the insulin bolus entirely because it is thought to raise this risk. (Honest footnote: the 2018 PECARN trial found no difference in neurological outcomes between faster and slower pediatric fluid replacement.)
Caution: Arrhythmias, renal strain & the untreated precipitant Hold & notify
Potassium shifts keep the myocardium irritable throughout treatment; the kidneys take a hypovolemic hit (follow BUN/creatinine); and whatever triggered the DKA — often an infection — is still there.
Continuous cardiac monitoring, trending renal function, and obtaining cultures to hunt the precipitating infection are part of the DKA workup, not extras.

Medications for this condition

Why each class is prescribed here — every card links to its full pharmacology page.

Insulins First-line High-alert
Endocrine

IV regular insulin by continuous infusion (0.1 U/kg/h) is the mainstay of DKA treatment: it restores glucose uptake and shuts off gluconeogenesis and glycogenolysis — and, by correcting the deficiency itself, stops the lipolysis-to-ketone cascade producing the acid. Its short action (onset ≈ 1 h, IV-titratable, duration ≈ 4 h) is exactly what an hourly-titrated drip needs. Demands close glucose and potassium monitoring — see the sequence.
Electrolyte & Fluid Replacement First-line High-alert
Renal

First-line and before insulin: isotonic 0.9% NaCl reverses an osmotic-diuresis deficit of up to 10–15% of body weight; potassium added to the fluids pre-empts insulin-induced hypokalemia (total-body deficit 3–6 mmol/kg despite the normal-looking serum value); and dextrose joins the fluids once glucose falls below ~250 mg/dL so the insulin can keep running until the gap closes.

Beyond medications

  • Hunt the precipitant — screen for infection and obtain cultures; the DKA is often the messenger for a pneumonia, UTI, MI, or missed insulin, and the trigger needs its own treatment.
  • Sick-day plan — when sick or when glucose is 250 mg/dL or above, check blood sugar every 4 to 6 hours and test for ketones; blood β-hydroxybutyrate is more specific than urine testing. Illness raises insulin needs even when the patient isn’t eating.
  • Insulin-pump vigilance — a clogged insulin pump is one of the recognized routes into DKA, and in pump users management errors and infection are even more common triggers than device failure.
  • Medical ID — consider a bracelet noting the diabetes and the DKA episode.
  • Lifestyle & follow-up — smoking cessation, abstaining from alcohol, a healthy diet, and kept follow-up appointments; nonadherence and substance use are both recognized precipitants.

Nursing considerations

The RN-specific layer — each action paired with the reason it matters.

Assessment & monitoring
Check glucose hourly during the initial phase (point-of-care, hospital-calibrated meter).
Why: The infusion is titrated against it, and hypoglycemia strikes 5–25% of patients during treatment — glucose falls long before the ketones clear.
Trend electrolytes hourly at first, then every 2 hours until stable, then every 4 hours — watch the K⁺ line hardest.
Why: Insulin shifts potassium into cells continuously; the serum K⁺ that looked fine at admission can reach arrhythmia territory mid-infusion.
Keep the patient on a cardiac monitor and track vital signs closely.
Why: Potassium shifts in both directions make arrhythmias the standing threat of DKA treatment; abnormal vitals are a report-immediately finding.
Confirm urine output and renal function — before potassium goes in the bag, and throughout.
Why: Potassium replacement into failing kidneys invites hyperkalemia; BUN and creatinine also track the hypovolemic hit the kidneys took.
Auscultate the lungs for rales and crackles at every assessment.
Why: Aggressive volume resuscitation can overshoot — crackles are the early warning of fluid overload.
Reassess mental status every check; treat new headache, recurrent vomiting, or any drop in alertness as cerebral edema until proven otherwise.
Why: Cerebral edema is the most important cause of DKA mortality, and its warning signs (including incontinence and the Cushing triad) appear during treatment.
The acute phase — running the sequence
Start two large-bore IVs and begin 0.9% NaCl — about 15–20 mL/kg in the first hour (500–1000 mL/h for the first 2–4 h), as ordered.
Why: Fluids come first: the deficit can reach 10–15% of body weight, and perfusion is the immediate threat — not the glucose number.
Verify the serum potassium before the insulin infusion starts; if K⁺ < 3.5 mmol/L, hold the insulin and replace potassium first.
Why: Insulin shifts K⁺ into cells — starting it on a low-normal potassium converts a paper abnormality into a real arrhythmia.
Run the regular insulin infusion at 0.1 U/kg/h as ordered (no bolus in pediatric patients).
Why: The fixed-rate drip shuts off ketogenesis at its source; pediatric protocols omit the bolus because it is thought to raise cerebral-edema risk.
Add potassium 20–30 mEq per litre of IV fluid while K⁺ sits between 3.5 and 5.0 mmol/L, targeting 4–5; above 5.0, no potassium yet — just frequent rechecks.
Why: Replacement chases a 3–6 mmol/kg total-body deficit that the insulin keeps pushing intracellularly.
When glucose reaches ≈ 200–250 mg/dL, anticipate adding dextrose 5–10% to the fluids and reducing insulin to 0.05 U/kg/h — never stopping it.
Why: The insulin must keep running until the ketoacidosis resolves (β-hydroxybutyrate < 0.6, pH ≥ 7.3 or HCO₃⁻ ≥ 18); dextrose is what makes that safe.
At transition, give the subcutaneous basal insulin 1–2 hours before the IV infusion stops, with a glucose and metabolic check first.
Why: IV insulin vanishes fast — without the overlap, the patient has a coverage gap and the ketogenesis can reignite.
Patient teaching (preventing the next one)
Never omit insulin — even when sick, vomiting, or not eating. Contact the care team instead of skipping doses.
Why: Insulin omission drives 13–60% of DKA episodes — the single most modifiable precipitant on the list.
Learn the sick-day rule: test ketones during any illness — urine strip first, blood β-hydroxybutyrate to quantify.
Why: Infection is the most common DKA trigger worldwide; ketone testing catches the cascade while it is still outpatient-manageable.
Pump users: know that a clogged pump stops insulin just as a missed injection does — check blood sugar often, especially when sick.
Why: Missing insulin — from skipped shots or a clogged pump — is one of the two most common causes of DKA.
Go to the emergency room or call 911 for drowsiness or confusion, blood sugar that stays at 300 mg/dL or above, fruity-smelling breath, vomiting with inability to keep food or drinks down, trouble breathing, several DKA symptoms together, or high ketones.
Why: These are the herald signs of established ketoacidosis — past the point of home management.
On an SGLT2 inhibitor? Check ketones when ill even if glucose looks fine.
Why: Euglycemic DKA presents with glucose under 250 mg/dL — a normal meter reading can hide a real ketoacidosis.

How a real nurse thinks

The clinical-judgment loop, worked for a typical presentation — reasoning, not reference.

  1. 1
    Recognize cues

    The cues that matter: two days without insulin, vomiting and abdominal pain, deep rapid respirations with fruity breath, drowsiness, dry membranes with HR 118 and BP 98/60 — and the lab trio of glucose 486, pH 7.12 with HCO₃⁻ 11, and β-hydroxybutyrate 5.6. The SpO₂ of 98% and temperature of 37.2 °C are the background noise: this is not a lung or fever story yet.

  2. 2
    Analyze cues

    The pattern is the full DKA triad — hyperglycemia, ketonemia, acidosis — precipitated by insulin omission. Severity: pH 7.0–7.25 with HCO₃⁻ 10 to < 15 and drowsiness = moderate DKA. The RR of 28 is Kussmaul compensation, not respiratory disease. And the K⁺ of 5.2 is the paradox, not reassurance: shifts have inflated the serum number while osmotic diuresis has drained the total-body store.

  3. 3
    Prioritize

    Circulation and volume outrank the glucose number: he is down as much as 10–15% of his body weight, tachycardic, and hypotensive. Sequence: fluids first → confirm the potassium before insulin → insulin infusion → anticipate dextrose. The vomiting, the cultures, and the abdominal pain all matter — after the sequence is running.

  4. 4
    Generate solutions

    Two large-bore IVs and the 0.9% NaCl bolus — at 60 kg, 15–20 mL/kg is roughly 900–1200 mL in the first hour. Confirm K⁺ ≥ 3.5 (his 5.2 clears the threshold; above 5.0 means no added potassium yet with frequent rechecks). Then the regular insulin infusion at 0.1 U/kg/h ≈ 6 units/h. Set up the hourly glucose and q2h electrolyte cadence, cardiac monitor on, cultures drawn.

  5. 5
    Take action

    Fluids running before anything else. Potassium verified against the 3.5 threshold — insulin started only then. Monitor on, and eyes on two traps for the hours ahead: the K⁺ will fall as insulin pushes it into cells (replacement starts once it drops below 5.0), and the glucose will reach 250 long before the ketones clear — the call to the provider then is for dextrose, never to stop the drip.

  6. 6
    Evaluate

    Success is the acidosis resolving, not the glucose normalizing: β-hydroxybutyrate < 0.6 mmol/L with pH ≥ 7.3 or HCO₃⁻ ≥ 18 — with K⁺ held at 4–5, lungs clear despite the volume, and mentation brightening. Re-escalate immediately for new headache, recurrent vomiting, or falling alertness — cerebral edema is the killer complication. At the end, the drip stops only 1–2 hours after the SubQ basal dose is given.

Scenario — you’re the nurse

Work each question before revealing the answer. Rationales explain the wrong options too.

Emergency department · 1930, triage handoff

A 22-year-old with type 1 diabetes, brought in by a roommate for a day of vomiting and abdominal pain. He ran out of insulin two days ago and hasn’t injected since. Weight 60 kg. Drowsy but arousable, breathing deep and fast; the triage nurse notes a fruity odor to his breath.

1930 vitals — HR 118 · BP 98/60 · RR 28, deep and regular · T 37.2 °C · SpO₂ 98% on room air
Assessment — dry mucous membranes, flushed face; drowsy, oriented when roused; abdomen diffusely tender, no guarding
1940 labs — glucose 486 mg/dL · pH 7.12 · HCO₃⁻ 11 mmol/L · β-hydroxybutyrate 5.6 mmol/L · anion gap 24 mEq/L · K⁺ 5.2 mmol/L · creatinine 1.3 mg/dL
Orders in — 0.9% NaCl bolus; regular insulin infusion per DKA protocol; hourly glucose; electrolytes q2h; cardiac monitor; blood and urine cultures
Q1 Select all that apply
On the initial assessment, which findings are consistent with diabetic ketoacidosis? Select all that apply.
  1. A. Deep, rapid respirations at 28/min
  2. B. Fruity odor to the breath
  3. C. Serum potassium 5.2 mmol/L
  4. D. SpO₂ 98% on room air
  5. E. HR 118 with BP 98/60
Reveal answer & rationale
Answer: A, B, C, E
Kussmaul respirations are the respiratory compensation for metabolic acidosis; the fruity breath is exhaled acetone from ketone breakdown; the K⁺ of 5.2 is classic — acidosis and insulin deficiency shift potassium out of cells, so serum K⁺ is normal or high at presentation despite total-body depletion; and the tachycardia with low-normal BP is the hypovolemia of osmotic diuresis. The normal SpO₂ (D) is neither expected nor unexpected in DKA — it simply isn’t part of the pattern; the breathing change is acid-driven, not oxygen-driven.
Q2 Multiple choice
The nurse reviews the admission potassium of 5.2 mmol/L. Which interpretation is correct?
  1. A. Total-body potassium is elevated; potassium replacement will not be needed at any point
  2. B. Acidosis and insulin deficiency have shifted potassium out of cells — the serum value is high while total-body potassium is depleted, and it will fall once insulin starts
  3. C. A potassium above 5.0 means the insulin infusion must be held
  4. D. The value is likely a hemolyzed specimen and should simply be redrawn
Reveal answer & rationale
Answer: B
This is the potassium paradox (B): the serum number reflects where potassium is, not how much exists — the total-body deficit runs 3–6 mmol/kg, and insulin will drive the serum level down fast. (A) confuses serum with total-body stores; replacement is anticipated once K⁺ drops below 5.0. (C) inverts the rule — insulin is held for K⁺ < 3.5, not for an elevated value; above 5.0 simply means no added potassium yet with frequent monitoring. (D) manufactures an error where physiology already explains the number.
Q3 Put in order
Place the nurse’s actions for this admission in the correct order:
  1. A. Start the regular insulin infusion at 0.1 U/kg/h
  2. B. Begin 0.9% NaCl at 15–20 mL/kg for the first hour via two large-bore IVs
  3. C. Verify the serum potassium is at least 3.5 mmol/L
  4. D. Anticipate adding dextrose 5–10% to the fluids as glucose approaches 200–250 mg/dL
Reveal answer & rationale
Correct order: B → C → A → D
The sequence is the answer: fluids first (the volume deficit is the immediate threat), then the potassium check before insulin (K⁺ < 3.5 means hold insulin and replace first — insulin started on a low K⁺ invites arrhythmia), then the insulin infusion, then dextrose once glucose falls so the infusion can continue until the ketoacidosis resolves. Starting insulin first (A) is the classic trap — it treats the most visible number while skipping the two steps that keep the patient safe.
Q4 Multiple choice
Two hours into the infusion, the potassium returns at 3.2 mmol/L (glucose 310 mg/dL). What should the nurse do?
  1. A. Continue the infusion unchanged — potassium normalizes as the acidosis clears
  2. B. Notify the provider now; anticipate pausing the insulin and replacing potassium until it is above 3.5 mmol/L
  3. C. Stop the IV fluids to prevent further dilution of the potassium
  4. D. Encourage potassium-rich foods and recheck at the next scheduled draw
Reveal answer & rationale
Answer: B
A K⁺ below 3.5 is the hold-insulin threshold (B): guidelines postpone insulin until potassium is above 3.5, because continuing to drive K⁺ into cells at 3.2 risks the arrhythmias that make hypokalemia the most common — and most dangerous — treatment complication. (A) has the physiology backwards: insulin therapy causes the fall; it will not self-correct while the drip runs. (C) punishes the wrong therapy — the fluids are treating the volume deficit, not diluting potassium. (D) is far too slow for an actively falling K⁺ on an insulin infusion.
Q5 Multiple choice
At hour five, glucose is 210 mg/dL, β-hydroxybutyrate 3.8 mmol/L, pH 7.21. Which provider order should the nurse anticipate?
  1. A. Discontinue the insulin infusion — the glucose is nearly normal
  2. B. Add dextrose 5–10% to the IV fluids and reduce the insulin to 0.05 U/kg/h, continuing until the ketoacidosis resolves
  3. C. Give the subcutaneous basal dose and stop the drip at the same time
  4. D. Administer IV sodium bicarbonate to speed pH correction
Reveal answer & rationale
Answer: B
Glucose normalizes before ketogenesis stops — the ketones (3.8) and pH (7.21) say the DKA is still active, so the answer is dextrose plus a reduced insulin rate (B), running until β-hydroxybutyrate is < 0.6 with pH ≥ 7.3 or HCO₃⁻ ≥ 18. Stopping insulin now (A) reignites the lipolysis-to-ketone cascade the drip was suppressing. (C) breaks the overlap rule — SubQ basal insulin goes in 1–2 hours before the infusion stops, and only once resolution criteria are met. (D) fails the threshold: bicarbonate is reserved for pH < 7.0, and this patient is at 7.21.

Common questions

What causes diabetic ketoacidosis?
Common causes and risk factors include infection — the most common precipitant globally (14–58%; pneumonia and uti most cited), insulin omission / nonadherence (13–60% of cases), new-onset (previously undiagnosed) diabetes (6–23%), insulin-pump problems — a clogged pump or a pump-management error, sglt2 inhibitors (euglycemic dka; ≈ 7-fold relative risk in type 2 diabetes), and others.
What are the early signs of diabetic ketoacidosis?
Early findings include Polyuria — urinating far more than usual, Polydipsia — being very thirsty, Fruity-smelling breath.
Which findings should a nurse report immediately in diabetic ketoacidosis?
Report immediately: Altered mental status or unresponsiveness, Dyspnea / respiratory distress, Abnormal vital signs, Cerebral edema — the most important cause of DKA mortality. These signal deterioration that needs rapid intervention.
Why are fluids given before insulin in DKA?
Because the immediate threat is a fluid deficit that can reach 10–15% of body weight from osmotic diuresis — isotonic 0.9% NaCl (15–20 mL/kg in the first hour) restores perfusion. Insulin also waits on one more check: if the potassium is below 3.5 mmol/L, insulin is held and potassium replaced first, because insulin shifts K⁺ into cells and can crash an already-depleted level.
Why can’t the insulin drip be stopped once the glucose comes down?
Glucose normalizes hours before ketone production stops. Stopping insulin at a glucose of 200 leaves the lipolysis-to-ketoacid cascade running — the acidosis persists or rebounds. Instead, dextrose 5–10% is added to the fluids around a glucose of 200–250 mg/dL and the insulin continues (at a reduced rate) until the ketoacidosis itself resolves: β-hydroxybutyrate < 0.6 mmol/L with pH ≥ 7.3 or bicarbonate ≥ 18 mmol/L.
What is euglycemic DKA?
Full ketoacidosis — metabolic acidosis plus ketonemia — with a glucose below 250 mg/dL. It has become more common with SGLT2 inhibitors (≈ 7-fold relative risk in type 2 diabetes) and also occurs with pregnancy, fasting or carbohydrate restriction, surgery, infection, and alcohol use disorder. Treatment differs in one key way: dextrose 5% is added to the fluids from the start.

Sources

Reviewed by Hae Suk Lee, RN

Educational summary for nursing students. Scenarios are fictional teaching cases. Always verify against current guidelines and your institution's protocols before acting in practice. Not medical advice.

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