Diabetic Ketoacidosis Mortality Prediction Model (DKA MPM) Score

Why use it

DKA mortality remains approximately 0.2–5% in developed countries, rising substantially with older age, severe acidosis, and altered consciousness. The DKA MPM score allows rapid identification of patients at high mortality risk who require ICU admission, aggressive monitoring, and intensified management beyond standard DKA protocols. It adds predictive value beyond the ADA severity classification alone.

About

The Diabetic Ketoacidosis Mortality Prediction Model (DKA MPM) Score is a validated clinical scoring system derived by Efstathiou and colleagues to predict in-hospital mortality in patients presenting with diabetic ketoacidosis (DKA). Using logistic regression in a cohort of 1,496 DKA episodes, the model identified four independent predictors of in-hospital death: (1) serum osmolality > 320 mOsm/kg, (2) blood urea nitrogen (BUN) > 35 mg/dL, (3) arterial pH < 7.10, and (4) Glasgow Coma Scale (GCS) score < 12. A score of 0 carries a predicted mortality < 1%; scores of 3–4 carry mortality exceeding 10–20%. This tool complements the ADA DKA severity classification (mild/moderate/severe) by adding a mortality risk dimension. It is particularly useful in the emergency department and ICU triage of DKA patients for appropriate level-of-care assignment.

When to use

• All adult patients presenting with confirmed or suspected DKA
• ED triage to determine appropriate disposition (ward vs. step-down vs. ICU)
• Rapid risk stratification when ICU beds are limited and prioritization is needed
• Baseline mortality estimation for informed consent and family communication
• Quality assurance monitoring of DKA outcomes at institutional level

Formula

Pearls & pitfalls

• The DKA MPM Score was derived and validated specifically for ADULT DKA — do NOT apply to pediatric DKA, which uses different scoring systems (e.g., PECARN DKA severity score).
• GCS < 12 (item 4) is the strongest single predictor of DKA mortality — any impairment of consciousness should prompt immediate ICU evaluation.
• Serum osmolality > 320 mOsm/kg often indicates significant dehydration and/or concurrent hyperosmolar hyperglycemic state (HHS) — these mixed DKA/HHS patients have worse prognosis.
• The ADA 2009 DKA guidelines define severity as: Mild (pH 7.25–7.30, HCO₃ 15–18), Moderate (pH 7.00–7.24, HCO₃ 10–14), Severe (pH < 7.00, HCO₃ < 10). The DKA MPM complements this classification with a mortality dimension.
• BUN > 35 mg/dL reflects severe dehydration — aggressive fluid resuscitation in the first 2 hours is the most critical intervention to lower mortality.
• Calculated serum osmolality = 2 × Na + (glucose/18) + (BUN/2.8). Use measured osmolality if available.
• Cerebral edema, a rare but catastrophic complication (primarily in children), is NOT specifically captured by the DKA MPM Score.
• Precipitating factors (infection, new-onset T1DM, insulin omission, MI) must be identified and treated concurrently — failure to address the precipitant leads to DKA recurrence.

Next steps

DKA MPM Score 0 (< 1% mortality): Standard DKA protocol. IV fluids, insulin infusion, electrolyte replacement. Ward or step-down level. Monitor q1–2h. Score 1 (< 5% mortality): Close monitoring. Consider step-down/HDU. Standard insulin infusion protocol. Reassess GCS and metabolic parameters q1h. Score 2 (5–10% mortality): ICU-level care preferred. Continuous monitoring. Senior physician involvement. Consider early endocrinology consultation. Score 3–4 (> 10–20% mortality): ICU admission required. Aggressive resuscitation. Early intensivist and endocrinologist involvement. Consider mechanical ventilation if GCS deteriorating. Discuss prognosis with family.

Evidence

Efstathiou SP et al. Predictors of mortality in diabetic acidosis: a 10-year experience. Diabet Med. 2002;19(5):374-380. PMID:12027921. Derived from 1,496 DKA episodes (1984–1994). Logistic regression identified 4 independent mortality predictors. AUROC = 0.88. Score 0: 0.6% mortality; Score 1: 4.5%; Score 2: 8.9%; Score 3: 15.8%; Score 4: ~25%. ADA DKA management guidelines: Kitabchi AE et al. Hyperglycemic crises in adult patients with diabetes. Diabetes Care. 2009;32(7):1335-1343.

References

1. Efstathiou SP et al. Predictors of mortality in diabetic acidosis: a 10-year experience. Diabet Med. 2002;19(5):374-380. — link
2. Kitabchi AE et al. Hyperglycemic crises in adult patients with diabetes: a consensus statement from the American Diabetes Association. Diabetes Care. 2009;32(7):1335-1343. — link
3. Dhatariya K et al. Management of diabetic ketoacidosis in adults. BMJ. 2023;381:e070bjo. — link