Diagnosis and Management of Diabetic Ketoacidosis (DKA), How to on IV Ri drip, 5 I's of Precipitating DKA

A table that recaps the diagnostic criteria, treatment steps (including dosing and orders), and the criteria for resolution of Diabetic Ketoacidosis (DKA):

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1. Diagnosis of DKA

The diagnosis of DKA is confirmed with the following criteria:

• Serum Glucose: > 200 mg/dL (11 mmol/L).
• Two of the following criteria:
  • Serum Bicarbonate: ≤ 15 mEq/L (15 mmol/L).
  • Arterial pH: < 7.3 (venous pH < 7.3 can also be used to confirm metabolic acidosis).
• Additional laboratory findings that support the diagnosis include:
  • Elevated Ketones: Blood β-hydroxybutyrate > 3 mmol/L or positive urine ketones (> 2+).

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Precipitating Causes of DKA (The "5 I's")

DKA is often triggered by several factors, remembered by the mnemonic “5 I's”:

1. Infection: The most common trigger, leading to increased insulin resistance and elevated blood glucose.
2. Ischemia: Events such as myocardial infarction or stroke that increase metabolic stress.
3. Insulin Omission: Missing insulin doses, either intentionally or unintentionally.
4. Intoxication: Alcohol or drug use can lead to impaired insulin management.
5. Iatrogenic: Certain medications (e.g., corticosteroids) or incorrect insulin management.

Additional factors include:

• New-onset diabetes: DKA may be the first presentation of diabetes.
• Poor adherence to treatment: Whether due to misunderstanding, lack of access, or intentional omission (e.g., in eating disorders).
• Stressful events: Trauma, surgery, or severe illness.
• Substance abuse: Cocaine or alcohol use disrupts glucose metabolism.

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2. Pathophysiology of DKA

The pathophysiology of DKA revolves around the effects of insulin deficiency and counter-regulatory hormones, leading to the following changes:

1. Hyperglycemia: Due to insulin deficiency, glucose cannot enter cells, causing intracellular glucose deficiency despite hyperglycemia. This triggers gluconeogenesis and glycogenolysis, further increasing blood glucose levels.
2. Ketosis: Lipolysis is enhanced, leading to the production of ketones (ketogenesis), which accumulate in the blood (ketonemia) and are excreted in urine (ketonuria).
3. Osmotic Diuresis: Hyperglycemia causes glucose to be lost in urine (glycosuria), leading to the loss of electrolytes like sodium, potassium, and phosphate. This results in electrolyte imbalances.
4. Dehydration: Due to osmotic diuresis, significant water loss occurs, causing dehydration.

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3. Clinical Presentation of DKA

Signs and symptoms of DKA often present in children with type 1 diabetes for the first time:

• Dehydration: Low blood pressure, rapid heart rate; in severe cases, shock may occur.
• Kussmaul Breathing: Deep and labored breathing indicating metabolic acidosis.
• Gastrointestinal Symptoms: Nausea, vomiting, and abdominal pain.
• Altered Mental Status: From lethargy to coma.

Other symptoms may include:

• Polyuria and Polydipsia: Increased urination and thirst.
• Polyphagia: Increased hunger and weight loss.

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4. Severity Classification of DKA

The severity of DKA is categorized by the degree of metabolic acidosis:

Routine workup in my hospital includes VBG and electrolytes every 4 hours (q 4 hr).

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5. Initial Treatment of DKA

The primary goals of DKA management are to restore fluid volume, reverse ketosis, and correct electrolyte imbalances.

A. Fluid Management

Adult (Non-weight-based)

1. Initial Fluid Resuscitation:
   • Start with 0.9% normal saline (NSS) at 1 liter over the first hour to address dehydration and restore intravascular volume.
2. After the First Hour:
   • Continue IV fluids at a rate of 250-500 mL/hour, adjusting based on clinical parameters such as volume status, urine output, and vital signs.
3. Switch to Dextrose:
   • Once blood glucose levels fall below 200-250 mg/dL, switch to 5% dextrose with 0.45% NaCl to prevent hypoglycemia while continuing insulin therapy.
   • Note: In this phase, two IV lines may be needed to administer both saline and dextrose.

Pediatric (Weight-based)

1. Initial Fluid Resuscitation:
   • Assess DKA severity and calculate the fluid deficit based on severity:
     • Mild: 3-5% fluid deficit
     • Moderate: 5-7% fluid deficit
     • Severe: 7-10% fluid deficit
2. Shock Present:
   • Administer 0.9% NaCl (NSS), Ringer’s lactate (RLS), or Plasmalyte at 20 mL/kg over 15-30 minutes via IV bolus. If shock persists, repeat the bolus as needed.
3. No Shock:
   • Begin IV fluids with 0.9% NaCl at 10 mL/kg/hour (not exceeding 1-1.5 liters in the first hour, adjusted for obese children). This may be repeated but should not exceed 30 mL/kg in the first 2 hours.
4. Maintenance and Deficit Replacement:
   • After the initial bolus, calculate the required fluid for maintenance and deficit replacement over 48 hours.
   • Rate of IV fluids calculation:Rate(mL/hour)=(2×MaintenanceFluidfor24hours)+FluidDeficit−InitialFluidBolus48Rate (mL/hour) = \frac{(2 \times Maintenance Fluid for 24 hours) + Fluid Deficit - Initial Fluid Bolus}{48}Rate(mL/hour)=48(2×MaintenanceFluidfor24hours)+FluidDeficit−InitialFluidBolus​
   • Continue using 0.9% NaCl, RLS, or Plasmalyte for the first 4-6 hours. Afterward, switch to 0.45% NaCl based on the patient’s sodium levels.
5. Switch to Dextrose:
   • Once blood glucose drops below 250-300 mg/dL, switch to 5% dextrose with 0.45% NaCl to prevent hypoglycemia while continuing insulin therapy.

B. Insulin Therapy (Regular Insulin - RI)

Adult (Non-weight-based)

1. Insulin Drip Preparation:
   • Mix 100 units of regular insulin (RI) in 100 mL of normal saline (NSS) to achieve a concentration of 1 unit/mL.
2. Initial Infusion Rate:
   • Begin the insulin infusion at 0.1 units/kg/hour. For a 70 kg patient, this equals 7 mL/hour.
   • No bolus insulin is necessary to avoid rapid glucose drops, which can lead to complications like cerebral edema.
3. Glucose Monitoring:
   • Monitor blood glucose every 1-2 hours, aiming for a gradual reduction of 50-70 mg/dL/hour. Adjust the insulin rate accordingly to maintain this rate of glucose reduction.

Pediatric (Weight-based)

1. Insulin Drip Preparation:
   • Mix 50 units of regular insulin in 50 mL of 0.9% NaCl, resulting in a concentration of 1 unit/mL, to allow for accurate dosing in smaller children.
2. Initial Infusion Rate:
   • Begin insulin at 0.05-0.1 units/kg/hour, depending on the child’s size and DKA severity.
     • For younger children (<5 years) or those with increased insulin sensitivity, start at 0.05 units/kg/hour.
   • No insulin bolus should be given to prevent rapid glucose reduction, which could cause cerebral edema.
3. Glucose Monitoring:
   • Check blood glucose every hour and aim for a reduction of 50-100 mg/dL/hour. When blood glucose drops below 250-300 mg/dL, switch to dextrose-containing fluids while continuing insulin.
4. Adjusting Insulin:
   • If the blood glucose drops too quickly or falls below 150 mg/dL, increase the dextrose concentration rather than reducing the insulin rate. However, in young children or those with excellent insulin sensitivity, the insulin infusion rate may be reduced to 0.03 units/kg/hour.

C. Electrolyte Management

• C.1. Potassium Management in DKA

  • Initial Potassium Level > 5.2 mEq/L:
    • No potassium supplementation.
    • Monitor potassium levels closely every 2-4 hours to detect any decrease.
  • Potassium Level 3.3 - 5.2 mEq/L:
    • Add 20-30 mEq potassium (as KCl, KPO₄, or K₂CO₃) to each liter of IV fluid.
  • Potassium Level < 3.3 mEq/L:
    • Hold insulin until potassium is replaced (at least >3.3 mEq/L).
    • Potassium replacement should be started with 20-40 mEq/L of IV fluids.

• C.2. Bicarbonate (HCO₃⁻) Management

• Bicarbonate therapy is controversial in DKA and typically not recommended unless the pH is severely low (below 7.0).
  • pH < 7.0:
    • Administer 7.5% Sodium Bicarbonate in 100 mL sterile water (or D5W)
    • Repeat every 2 hours until the pH is ≥ 7.0.
    • Monitor serum bicarbonate levels closely to avoid overcorrection and associated complications like Cerebral edema, Paradoxical cerebral acidosis,Severe hypokalemia, and metabolic alkalosis.
  • pH ≥ 7.0:
    • Bicarbonate therapy is not required.
    • Continue with fluid resuscitation and insulin therapy to correct metabolic acidosis through natural processes.

• C.3. Phosphate (PO₄³⁻) Management

• Phosphate depletion is common in DKA due to osmotic diuresis. However, routine phosphate replacement is not usually necessary unless the patient has specific risk factors or symptoms of hypophosphatemia (weakness, respiratory failure, or cardiac dysfunction).
  • Phosphate Level < 1.0 mg/dL or symptomatic hypophosphatemia:
    • Administer 20-30 mEq/L potassium phosphate (KPO₄) in IV fluids.
  • Phosphate Level ≥ 1.0 mg/dL:
    • Routine phosphate replacement is not recommended, but levels should be monitored.

d. Ketone and Lactate Monitoring

• Blood Ketones (β-hydroxybutyrate): Check every 2-4 hours to ensure that ketoacidosis is resolving. The goal is for β-hydroxybutyrate to fall below 1 mmol/L.
• Lactate: Monitor if there is concern for lactic acidosis.

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6. Criteria for Resolution of DKA

A patient is considered out of DKA when the following criteria are met:

1. Blood Glucose: Less than 200 mg/dL.
2. Serum Bicarbonate: Greater than or equal to 18 mEq/L.
3. Arterial pH: Greater than 7.30.
4. Serum Ketones (BOHB): Less than 0.6 mmol/L.

Important Considerations:

1. One-Time Drop Counts:
   • If any one of these values has dropped into the target range (for example, blood glucose < 200 mg/dL or ketones < 0.6 mmol/L), then it counts as having "resolved" for that particular parameter. Even if the value rises slightly later (for example, glucose rises to 220 mg/dL or ketones rise to 2.5 mmol/L), we still consider that parameter resolved as long as the other three criteria have been met.
2. Focus on Remaining Criteria:
   • If a patient's blood glucose or ketone levels fall within the required range at least once, you will only need to focus on the remaining criteria (pH and bicarbonate) to confirm full resolution of DKA. The fact that one parameter fluctuates or rises slightly again does not reverse the progress toward resolving DKA unless all the other criteria return to abnormal levels.
3. No Immediate Re-diagnosis of DKA:
   • Even if one parameter (like glucose or ketones) later rises back into the abnormal range after having resolved, we do not re-diagnose the patient with DKA unless all four of the original criteria for DKA are met again simultaneously.
4. Ketone Buffer Zone:
   • Ketones can rise above 0.6 mmol/L but not exceed 3 mmol/L. This is considered acceptable, as ketones fluctuate naturally. If ketones initially drop below 0.6 mmol/L, a slight increase later does not mean the patient is still in DKA.

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7. Transition from IV Insulin to Subcutaneous Insulin

Once the patient is out of DKA, you can transition from IV insulin to subcutaneous insulin.

Transition Protocol:

1. Overlapping Insulin: Administer a dose of long-acting subcutaneous insulin (such as glargine or detemir) 2 hours before discontinuing IV insulin to prevent rebound hyperglycemia and recurrence of ketosis.
2. Regular Insulin: Resume the patient's regular insulin regimen, typically a sliding scale or scheduled subcutaneous insulin injections.

a. Sliding Scale Insulin (SSI) aka. RI Scale

• After transitioning out of DKA, continue using a sliding scale insulin (SSI) regimen based on blood glucose levels.
• For example:
  • DTX Levels and Management Instructions:
    1. DTX < 80 mg/dL:
       • Management: Administer 50% Glucose 50 mL IV.
       • Note: This is for managing hypoglycemia (low blood sugar).
    2. DTX 181 - 200 mg/dL:
       • Management: Administer RI 2 units subcutaneously (sc).
    3. DTX 201 - 250 mg/dL:
       • Management: Administer RI 4 units sc.
    4. DTX 251 - 300 mg/dL:
       • Management: Administer RI 6 units sc.
    5. DTX 301 - 350 mg/dL:
       • Management: Administer RI 8 units sc.
    6. DTX > 350 mg/dL:
       • Management: Administer RI 10 units sc.
    Notes:
    • Serial DTX Measurement: This protocol applies specifically to patients who require serial DTX measurements, not those receiving continuous RI drip or those adjusting their glucose levels with other interventions.
    • High DTX Protocol: In cases of very high DTX levels, blood sugar should be measured and sent to the laboratory for verification each time insulin is administered.

b. Continue Monitoring

• Monitor Blood Glucose: Continue to check blood glucose levels every 4-6 hours while on subcutaneous insulin.
• Monitor BOHB: Continue monitoring β-hydroxybutyrate every 2 hours until it remains consistently < 0.6 mmol/L.

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Summary of Management Plan for DKA

1. Initial Insulin Therapy:
   • Insulin Drip: Start at 0.1 units/kg/hour for adults and pediatrics (adjust for younger children if needed). No bolus insulin to prevent rapid glucose shifts.
2. Fluid Management:
   • Initial Fluid Resuscitation: Start with 0.9% normal saline at 1 liter over the first hour in adults or weight-based fluid replacement in pediatrics.
   • After initial resuscitation, continue with maintenance fluids, adjusting based on clinical needs.
   • Switch to Dextrose: When blood glucose drops below 200-250 mg/dL, switch to 5% dextrose with 0.45% NaCl to prevent hypoglycemia while continuing insulin therapy.
3. Electrolyte Monitoring and Replacement:
   • Potassium: Monitor potassium every 2-4 hours and replace as needed. Potassium is added to IV fluids unless initial levels are elevated (> 5.2 mEq/L).
   • Bicarbonate: Only administer if pH is below 7.0 or in severe acidosis. Otherwise, correct acidosis with fluids and insulin.
   • Phosphate: Replace phosphate if levels are < 1.0 mg/dL or if clinical signs of hypophosphatemia are present.
4. Ketone and Lactate Monitoring:
   • Blood Ketones (β-hydroxybutyrate, BOHB): Regularly monitor every 2-4 hours to track the resolution of ketoacidosis. The target is now < 0.6 mmol/L, as per new guidelines.
   • Lactate: Monitor only if lactic acidosis is suspected.
5. Criteria for Resolution of DKA: A patient is considered out of DKA when the following criteria are met:
   • Blood Glucose: < 200 mg/dL.
   • Serum Bicarbonate: ≥ 18 mEq/L.
   • Arterial pH: > 7.30.
   • Serum Ketones (BOHB): < 0.6 mmol/L.
   Important Note:
   • One-Time Drop Counts: If any of these values reach the target range once (e.g., blood glucose < 200 mg/dL or ketones < 0.6 mmol/L), this counts as resolved for that parameter. Even if the value rises later (e.g., glucose rises to 220 mg/dL), as long as the other criteria are met, the patient can still be considered out of DKA.
   • No Immediate Re-diagnosis: If one parameter (e.g., glucose or ketones) later rises into the abnormal range, we do not re-diagnose DKA unless all four original criteria are met again.
6. Transition from IV Insulin to Subcutaneous Insulin:
   • Note: Continue IV insulin (RI drip) until the patient is able to eat and is confirmed to be out of DKA.
   • Overlapping Insulin: Administer long-acting subcutaneous insulin (such as glargine or detemir) 2 hours before discontinuing IV insulin to avoid rebound hyperglycemia.
   • Regular Insulin: Resume the patient’s regular insulin regimen with a sliding scale or scheduled subcutaneous insulin injections.
7. Ongoing Monitoring:
   • Continue monitoring blood glucose every 4-6 hours while on subcutaneous insulin.
   • Regularly check β-hydroxybutyrate (BOHB) every 2 hours until it consistently remains < 0.6 mmol/L.

Key Points for Safe and Effective Management:

• Insulin: Start at 0.1 units/kg/hour, no bolus. Continue until ketones resolve and the patient can eat.
• Fluids: Begin with saline, transition to dextrose when glucose normalizes.
• Electrolytes: Regular monitoring of potassium, bicarbonate, and phosphate.
• Ketones: Monitor β-hydroxybutyrate; the target is now < 0.6 mmol/L.
• Transition: Overlap subcutaneous insulin to ensure a smooth transition from IV insulin and avoid DKA recurrence.

This structured plan ensures safe and effective DKA management, focusing on fluid resuscitation, insulin therapy, and clear criteria for transitioning out of DKA.