## Clinical Scenario Analysis This patient presents with **diabetic ketoacidosis (DKA)** — a medical emergency characterized by: - Severe hyperglycemia (450 mg/dL) - Metabolic acidosis (pH 7.25, HCO₃⁻ 12) - Positive serum ketones - Kussmaul respiration (compensatory hyperventilation) - Undetectable C-peptide (indicating absolute insulin deficiency → Type 1 diabetes) ## Management Algorithm for DKA ```mermaid flowchart TD A[DKA Diagnosis Confirmed]:::outcome --> B[Establish IV access]:::action B --> C[Fluid resuscitation: 0.9% NaCl]:::action C --> D[Continuous IV insulin infusion]:::action D --> E[Monitor K⁺, electrolytes q1-2h]:::action E --> F[Recheck ABG, glucose q2-4h]:::action F --> G[Transition to SC insulin when stable]:::action ``` ## Key Point: **Insulin infusion is the definitive treatment for DKA.** The combination of severe acidosis, ketosis, and absolute insulin deficiency (undetectable C-peptide) mandates immediate IV insulin after initial fluid and electrolyte correction. ## High-Yield Facts: - **Initial fluid resuscitation** (0.9% NaCl 1–1.5 L/h) corrects hypovolemia and lowers glucose osmotically before insulin is given - **Insulin infusion rate**: 0.1 U/kg/h IV (e.g., 6–10 U/h for a 70 kg patient); do NOT use bolus dosing in DKA - **Potassium monitoring**: K⁺ falls as insulin drives glucose and K⁺ intracellularly; replacement is essential even if initial K⁺ is high - **Resolution criteria**: pH > 7.30, HCO₃⁻ > 15, glucose < 250 mg/dL, anion gap closed ## Clinical Pearl: **Undetectable C-peptide = absolute insulin deficiency = Type 1 diabetes.** This patient requires lifelong insulin; oral agents alone are contraindicated. ## Warning: ~~Do not delay insulin waiting for HbA1c or other investigations~~ — DKA is a medical emergency requiring immediate IV insulin. HbA1c is useful for confirming chronicity of hyperglycemia but does not guide acute management.
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