Cerebral Edema and Diabetic Ketoacidosis
Cerebral edema is the most feared emergent complication of pediatric diabetic ketoacidosis. Fortunately, it is relatively rare, but the rarity can lead to some confusion when it comes to its management. We recently discussed the use of mannitol and hypertonic saline for pediatric traumatic brain injury, but when should we consider these medications for the patient presenting with DKA?
Cerebral Edema with Pediatric DKA Basics
- Cerebral Edema is a relatively rare.
- Incidence <1% of patients with DKA.
- Overall tends to occur in the newly diagnosed diabetic patient (4.3% vs 1.2%).
- While rare, it is a devastating complication.
- 1990 study showed case fatality rate was 64%.
- Those treated BEFORE respiratory failure had lower rate of mortality (30%).
- Lesson = treat early!
- The exact mechanism is not known… and may be varied between individual patients.
- Signs and Symptoms develop in:
- 66% within the first 7 hours of treatment (these tend to be younger).
- 33% within 10-24 hours of treatment.
- The diagnosis is clinical!
- ~40% of initial brain imaging of kids with cerebral edema are NORMAL!
Risk Factors for Developing Cerebral Edema
This is the area that often leads to finger pointing… most often those fingers being pointed toward the Emergency Physician who was initially caring for the kid.
- Much of the literature focused on interventions, but:
- Administration of Bicarb
- Sodium Bicarb was shown to be associated with Cerebral Edema in one study…
- Unfortunately, this study did not adjust for illness severity.
- Type of IV Fluids
- Generally, there is an absence of evidence that associates volume, tonicity, or rate change in serum glucose with Cerebral Edema development.
- There are cases presenting with cerebral edema prior to any therapies.
- Administration of Bicarb
- Risk Factors that seem to stay consistent:
- Kids < 5 years of age
- More likely to have delayed diagnosis
- More severely ill at presentation
- Severity of Acidosis
- Elevated BUN
- Greater degree of dehydration
- Kids < 5 years of age
- Early detection and treatment is the best means to prevent brain injury and death.
- But, abnormal neurological signs are common in kids with DKA and they don’t all need therapy.
- GCS score is not sensitive enough.
- Muir et al published a Bedside Evaluation of Neuro State of Kids with DKA
- Diagnostic Criteria
- Abnormal motor or verbal response to pain
- Decorticate or Decerebrate posture
- Cranial Nerve Palsy (especially III, IV, or VI)
- Abnormal neurologic respiratory pattern (grunting, Cheyne-Stokes, etc)
- Major Criteria
- Altered mentation / fluctuating level of consciousness
- Heart rate decelerations (decline of more than 20 bpm) not due to improved hydration or sleep
- Age-inappropriate incontinence
- Minor Criteria
- Lethargy or being not easily aroused from sleep
- Diastolic BP > 90 mmHg
- Age < 5 yrs
- Having either 1 Diagnostic Criterion, 2 Major Criteria, or 1 Major and 2 Minor criteria lead to 92% sensitivity and 96% specificity for recognition of Cerebral Edema early enough for intervention.
- This does lead treating an additional 5 children who don’t have Cerebral Edema for every 1 child who does.
- Diagnostic Criteria
- A critical MORSEL is that for every child you treat for DKA needs to have an initial thorough neuro exam including Cranial Nerves and then frequent reassessments… and document it (so your colleagues who take over care for the kid can know if there has been a change)!
- Mannitol 1 gram/kg over 20 minutes.
- May repeat as needed in 1-2 hours.
- Hypertonic Saline 5-10 mL/kg 3% saline is an option if no improvement with Mannitol.
- Decrease IV Fluids
- Head of Bed at 30 degrees.
- AVOID if able to… associated with worse outcomes.
- Reserve only for those with respiratory failure.
- The consideration of cerebral edema does not require intubation.
White PC1, Dickson BA. Low morbidity and mortality in children with diabetic ketoacidosis treated with isotonic fluids. J Pediatr. 2013 Sep;163(3):761-6. PMID: 23499379. [PubMed] [Read by QxMD]
Rosenbloom AL. The management of diabetic ketoacidosis in children. Diabetes Ther. 2010 Dec;1(2):103-20. PMID: 22127748. [PubMed] [Read by QxMD]
Morales AE1, Daniels KA. Cerebral edema before onset of therapy in newly diagnosed type 2 diabetes. Pediatr Diabetes. 2009 Apr;10(2):155-7. PMID: 19261103. [PubMed] [Read by QxMD]
Lawrence SE1, Cummings EA, Gaboury I, Daneman D. Population-based study of incidence and risk factors for cerebral edema in pediatric diabetic ketoacidosis. J Pediatr. 2005 May;146(5):688-92. PMID: 15870676. [PubMed] [Read by QxMD]
Muir AB1, Quisling RG, Yang MC, Rosenbloom AL. Cerebral edema in childhood diabetic ketoacidosis: natural history, radiographic findings, and early identification. Diabetes Care. 2004 Jul;27(7):1541-6. PMID: 15220225. [PubMed] [Read by QxMD]
Marcin JP1, Glaser N, Barnett P, McCaslin I, Nelson D, Trainor J, Louie J, Kaufman F, Quayle K, Roback M, Malley R, Kuppermann N; American Academy of Pediatrics. The Pediatric Emergency Medicine Collaborative Research Commitee. Factors associated with adverse outcomes in children with diabetic ketoacidosis-related cerebral edema. J Pediatr. 2002 Dec;141(6):793-7. PMID: 12461495. [PubMed] [Read by QxMD]
Glaser N1, Barnett P, McCaslin I, Nelson D, Trainor J, Louie J, Kaufman F, Quayle K, Roback M, Malley R, Kuppermann N; Pediatric Emergency Medicine Collaborative Research Committee of the American Academy of Pediatrics. Risk factors for cerebral edema in children with diabetic ketoacidosis. The Pediatric Emergency Medicine Collaborative Research Committee of the American Academy of Pediatrics. N Engl J Med. 2001 Jan 25;344(4):264-9. PMID: 11172153. [PubMed] [Read by QxMD]
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For one of the minor criteria, it seems that most kids have a “◾Diastolic BP < 90 mmHg", is this supposed to be the systolic BP?
YOU WIN THE EAGLE EYE AWARD!
The correct minor criteria should read “>” not “<" for diastolic BP. Thank you for your excellent vision and obvious critical appraisal! The correction has been made within the post. It now reads: Diastolic > 90.
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