Pediatric Diabetic Ketoacidosis and Cerebral Edema Risk
Eli is a 9-year-old boy, 38 kg, brought to the emergency department with 24 hours of vomiting and abdominal pain. He has polyuria and polydipsia for 2 weeks and a 4-kg weight loss. He is drowsy but arousable, with deep, rapid respirations and a fruity breath odor. Vital signs: HR 132, BP 96/58, RR 32, SpO2 98%, temperature 37.4°C. Capillary glucose is 512 mg/dL; venous pH 7.10; bicarbonate 8 mEq/L; potassium 5.4 mEq/L; sodium 132 mEq/L; BUN 28 mg/dL; large serum ketones. A 0.9% sodium chloride bolus of 20 mL/kg is ordered, followed by an insulin infusion at 0.05 units/kg/hr. The parents are frightened and ask why he cannot just receive a large dose of insulin. The unit has one RN and one UAP; another child with status asthmaticus is arriving.
1. What is the priority assessment and action, and why is a large insulin bolus dangerous?
Read the worked answer
Priority is ABCs and perfusion: assess airway, respiratory effort, mental status, capillary refill, and blood pressure while placing on continuous cardiac and pulse oximetry monitoring. Establish a second IV and begin the ordered isotonic fluid bolus; DKA causes profound dehydration, and shock can worsen if insulin is given before volume is restored. A large insulin bolus is dangerous because it drives glucose and potassium into cells rapidly, worsening hypotension and causing lethal hypokalemia; it also increases the risk of cerebral edema from rapid osmolar shifts. Low-dose insulin infusion after initial fluid resuscitation is safer.
Check glucose and potassium hourly initially, and add potassium to fluids once the potassium is below the upper limit and urine output is established. Do not give bicarbonate unless pH is severely low per protocol. Reassess the 20 mL/kg bolus with the provider if signs of shock are absent, because smaller volumes may be safer in pediatric DKA.
2. What signs suggest cerebral edema, and what immediate actions should the nurse take?
Read the worked answer
Suspect cerebral edema with headache, irritability, drowsiness, confusion, incontinence, pupillary changes, bradycardia, hypertension, or declining respiratory effort. In a child with DKA, these are emergencies, not expected recovery. Immediately reduce the fluid rate per protocol, elevate the head of the bed, ensure airway and oxygenation, give mannitol 0.5–1 g/kg or hypertonic saline 3% as ordered, and call the provider. Do not delay treatment for imaging if the child is unstable. Continue close neurologic checks every 15–30 minutes during the high-risk period. Document the time of onset and interventions. The nurse should also monitor for hypoglycemia, hypokalemia, and fluid overload.
3. How should the nurse delegate during the arrival of another critically ill child, and what should the parents be taught?
Read the worked answer
The UAP can obtain vital signs, weight, urine output, and fingerstick glucose if trained and competency-validated, but the RN must interpret values and assess neurologic status. The UAP should report a glucose below 70 or above 300, a falling heart rate, or a change in behavior immediately. The RN must remain with the child during neuro checks and teach the parents. Explain that DKA is not caused by bad parenting; insulin is needed even when the child is not eating, and sick-day rules include checking ketones, maintaining fluids, and calling the team early. Teach the parents never to skip insulin and to recognize vomiting, abdominal pain, and rapid breathing as warning signs. Because another critically ill child is arriving, request additional staffing rather than delegating assessment to the UAP.