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I now have comprehensive content from two authoritative sources. Let me synthesize the full clinical picture of DKA.
Diabetic Ketoacidosis (DKA) — Clinical Overview
Definition / Diagnostic Criteria
The three fundamental biochemical features of DKA are:
- Hyperglycemia (or known diabetes) — "D"
- Ketonuria ≥2+ or serum ketones ≥3.0 mmol/L — "K"
- pH <7.3 (arterial or venous) — "A"
DKA severity by pH: mild 7.20–7.30; severe <7.00.
Pathophysiology
DKA results from insulin deficiency + glucagon excess, which drives:
- Hyperglycemia → osmotic diuresis → profound dehydration and electrolyte loss
- Lipolysis → elevated free fatty acids → hepatic ketogenesis (β-hydroxybutyrate, acetoacetate, acetone)
- Proteolysis → amino acid release → gluconeogenesis → worsening hyperglycemia
- Acidosis → Kussmaul breathing (respiratory compensation), depressed mental status, hyper-kalaemia (K⁺ shifts out of cells)
In 95% of patients, total sodium is normal or low, but serum K⁺ is often falsely elevated due to acidosis — true total-body K⁺ is always depleted.
Common Precipitants
| Most Common | Other |
|---|---|
| Infection | CVA, PE, pancreatitis |
| Missed/inadequate insulin | Alcohol intoxication |
| New-onset T1DM (~25% of cases) | Corticosteroids, clozapine, SGLT2 inhibitors |
| Acute coronary syndrome | Cocaine, sympathomimetics, thiazides |
Clinical Features
- Symptoms: Polyuria, polydipsia, polyphagia, blurred vision, weakness, weight loss, nausea/vomiting, abdominal pain (~50%, especially in children)
- Signs: Kussmaul breathing, tachycardia, hypotension/orthostasis, acetone breath, dehydration, ± altered sensorium
- Fever is not caused by DKA itself — suggests infection
Labs (DKA vs HHS)
| Parameter | DKA | HHS |
|---|---|---|
| Glucose | >350 mg/dL | >700 mg/dL |
| Sodium | Low 130s mEq/L | 140s mEq/L |
| Potassium | ~4.5–6.0 mEq/L | ~5 mEq/L |
| Bicarbonate | <10 mEq/L | >15 mEq/L |
| BUN | 25–50 mg/dL | >50 mg/dL |
| Serum ketones | Present | Absent |
Average fluid/electrolyte deficits in severe DKA:
- Water: 70–120 mL/kg (weight-dependent)
- Sodium: 8–10 mEq/kg
- Potassium: 5–7 mEq/kg
- Phosphorus: ~3 mEq/kg
Pitfall: Standard nitroprusside ketone tests detect acetoacetate only — β-hydroxybutyrate (often predominant) is not detected, so ketosis may be underestimated. As insulin therapy begins, β-hydroxybutyrate converts to acetoacetate, falsely suggesting worsening ketosis. Point-of-care capillary ketone monitors are preferred.
WBC is often elevated in DKA even without infection. Elevated amylase is usually non-pancreatic.
Treatment
1. Fluids (First Priority)
- Fluid losses of 5–10 L, sodium losses 5–10 mmol/kg, potassium losses up to 7 mmol/kg
- Restore circulating volume first — this is paramount
- Caution: Large volumes of 0.9% NaCl can cause hyperchloraemic (non-anion-gap) metabolic acidosis
2. Insulin
- Insulin inhibits lipolysis and gluconeogenesis, and stimulates glucose uptake
- IV infusion is standard; subcutaneous rapid-acting analogues are also effective
- Do not start insulin until K⁺ is ≥3.5 mEq/L — insulin drives K⁺ into cells and can cause fatal hypokalaemia
3. Potassium Replacement
- Even when serum K⁺ is initially elevated, it falls rapidly after insulin is started
- Replace K⁺ once it drops; monitor continuously
- In DKA on insulin pumps: assume pump failure, disconnect, and start IV insulin
4. Monitoring
- Continuous cardiac monitoring (ICU or intermediate care)
- Capillary ketone monitoring to guide resolution
- Bicarbonate use is not routinely recommended
DKA vs Alcoholic Ketoacidosis
| Feature | DKA | AKA |
|---|---|---|
| Glucose | High (>350) | Normal or low |
| pH | Acidaemic | Often alkalaemic |
| Context | Diabetes | Recent alcohol abstinence |
| Main ketone | β-hydroxybutyrate | β-hydroxybutyrate |
Sources: ROSEN's Emergency Medicine, pp. 2542–2546; Goldman-Cecil Medicine, pp. 2483–2484
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