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==Background==
==Background==
*1% of patients with DKA<ref>Cooke & Plotnick. Management of diabetic ketoacidosis in children and adolescents. Pediatr Rev. 2008 Dec;29(12):431-5</ref>
 
*Almost all affected pts are <20yr <ref>Glaser NS, Wootton-Gorges SL, Buonocore MH, Marcin JP, Rewers A, Strain J, et al. Frequency of sub-clinical cerebral edema in children with diabetic ketoacidosis. Pediatr Diabetes. Apr 2006;7(2):75-80.</ref>
*Most feared complication of pediatric [[Special:MyLanguage/DKA|DKA]]; accounts for 50-65% of all DKA deaths<ref name="ISPAD2022">Glaser N, Fritsch M, Priyambada L, et al. ISPAD Clinical Practice Consensus Guidelines 2022: Diabetic ketoacidosis and hyperglycemic hyperosmolar state. Pediatr Diabetes. 2022;23(7):835-856. doi:10.1111/pedi.13406</ref>
*Associated with initial bicarb level; not rate of glucose drop
*Occurs in 0.5-1% of pediatric DKA episodes (up to 4-5% with subclinical edema on imaging)<ref name="Cooke">Cooke & Plotnick. Management of diabetic ketoacidosis in children and adolescents. Pediatr Rev. 2008 Dec;29(12):431-5</ref><ref name="Glaser2006">Glaser NS, Wootton-Gorges SL, Buonocore MH, Marcin JP, Rewers A, Strain J, et al. Frequency of subclinical cerebral edema in children with diabetic ketoacidosis. Pediatr Diabetes. Apr 2006;7(2):75-80.</ref>
*Mortality rate: 21-24%; significant neurologic morbidity (10-26%) in survivors<ref name="ISPAD2022"/><ref name="Muir2004">Muir AB, 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.</ref>
*Almost all affected patients are <20 years old<ref name="Glaser2006"/>
*Mental status abnormalities (GCS <14) occur in 4-15% of children treated for DKA and are often associated with mild cerebral edema on imaging<ref name="ISPAD2022"/>
 
===Pathophysiology===
 
*Previously attributed to osmotic shifts with rapid IV fluid administration; this model has been largely disproven
*Current understanding favors cerebral hypoperfusion and reperfusion injury during DKA treatment as the primary mechanism<ref name="PECARN">Kuppermann N, Ghetti S, Schunk JE, et al. Clinical Trial of Fluid Infusion Rates for Pediatric Diabetic Ketoacidosis. N Engl J Med. 2018;378(24):2275-2287. doi:10.1056/NEJMoa1716816</ref><ref name="ISPAD2022"/>
*Cerebral edema has been found on imaging even before treatment is initiated, including in children found dead at home from undiagnosed DKA<ref name="ISPAD2022"/>
*Bicarbonate administration is independently associated with cerebral edema (persists after correcting for DKA severity) — avoid bicarbonate in pediatric DKA<ref name="Glaser2001">Glaser N, Barnett P, McCaslin I, et al. Risk factors for cerebral edema in children with diabetic ketoacidosis. N Engl J Med. 2001;344(4):264-269.</ref>


===Risk Factors===
===Risk Factors===
*Age <5yo
 
*Age <5 years
*New-onset diabetes (first DKA presentation)
*Severe [[Special:MyLanguage/acidosis|acidosis]] (pH <7.1, pCO₂ <20)
*Higher [[Special:MyLanguage/BUN|BUN]] at presentation (marker of dehydration severity)<ref name="Glaser2001"/>
*Failure of corrected sodium to rise with treatment<ref name="Glaser2001"/>
*Severe hyperosmolality
*Severe hyperosmolality
*Failure of Na to rise w/ therapy
*Bicarbonate administration<ref name="Glaser2001"/>
*Severe acidosis
*Late presentation for medical evaluation
*Overaggressive fluid resuscitation is NOT a risk factor
*Previous episodes of DKA
*Overaggressive fluid resuscitation is ''NOT'' a proven risk factor — the PECARN FLUID trial (1,389 episodes) showed neither fluid rate nor sodium content significantly affected neurologic outcomes<ref name="PECARN"/>
 


==Clinical Features==
==Clinical Features==
*Begins 6-12hr after onset of therapy or may begin before initiation of treatment or up to 48h afterward
 
**Many appear to be improving from their DKA before deteriorating from cerebral edema
*Typically begins 4-12 hours after onset of therapy, but may occur before treatment or up to 48 hours later<ref name="ISPAD2022"/>
*Premonitory symptoms:
**Many children appear to be improving from DKA before deteriorating from cerebral edema
**[[Headache]]  
**Can occur at presentation in new-onset diabetes (including type 2)<ref name="ISPAD2022"/>
**Incontinence
 
**[[Seizure]]
===Warning Signs (use Muir Criteria for early detection)===
**Acute [[Mental Status Change]]
 
**Signs of herniation
Diagnostic criteria (any ONE is diagnostic):<ref name="Muir2004"/>
*Abnormal motor or verbal response to pain
*[[Special:MyLanguage/Decorticate posturing|Decorticate]] or [[Special:MyLanguage/decerebrate posturing|decerebrate]] posture
*[[Special:MyLanguage/Cranial nerve palsies|Cranial nerve palsy]] (especially III, IV, VI)
*Abnormal neurogenic respiratory pattern (grunting, tachypnea, Cheyne-Stokes, apneusis)
 
Major criteria:<ref name="Muir2004"/>
*Altered mentation / fluctuating level of consciousness
*Sustained heart rate deceleration (>20 bpm decrease) not attributable to improved intravascular volume or sleep
*Age-inappropriate [[Special:MyLanguage/urinary incontinence|incontinence]]
 
Minor criteria:<ref name="Muir2004"/>
*[[Special:MyLanguage/Vomiting|Vomiting]]
*[[Special:MyLanguage/Headache|Headache]]
*Lethargy or difficulty arousing
*Diastolic BP >90 mmHg
*Age <5 years
 
Interpretation: 1 diagnostic criterion, OR 2 major criteria, OR 1 major + 2 minor criteria → 92% sensitivity and 96% specificity for cerebral edema<ref name="Muir2004"/>
 
*GCS alone is not sensitive enough — use the Muir criteria above<ref name="Muir2004"/>
*Perform a thorough baseline neurologic exam (including cranial nerves) at presentation and document it so colleagues can identify changes
 


==Differential Diagnosis==
==Differential Diagnosis==
{{Hyperglycemia DDX}}
{{Hyperglycemia DDX}}


==Diagnosis==
*Also consider: [[Special:MyLanguage/hypoglycemia|hypoglycemia]] (most important to rule out first), [[Special:MyLanguage/cerebral venous thrombosis|cerebral venous thrombosis]], intracranial hemorrhage, stroke<ref name="ISPAD2022"/>
*Stat head CT (non-contrast)
 
 
==Evaluation==
 
*'''Cerebral edema in DKA is a CLINICAL diagnosis — do NOT delay treatment for imaging'''<ref name="ISPAD2022"/><ref name="Muir2004"/>
*Capillary [[Special:MyLanguage/glucose|glucose]] measurement '''immediately''' to rule out [[Special:MyLanguage/hypoglycemia|hypoglycemia]] as the cause of altered mental status
*[[Special:MyLanguage/CT brain|Head CT]] (non-contrast) — obtain after treatment has been initiated, NOT before<ref name="ISPAD2022"/>
**CT may be normal early (sensitivity is limited); used primarily to rule out other pathology (hemorrhage, thrombosis)
**CT may show diffuse cerebral edema, small ventricles, or loss of sulcal markings
*Monitor corrected sodium during DKA treatment — failure of corrected sodium to rise as glucose falls suggests excess free water and increased risk<ref name="Glaser2001"/><ref name="ISPAD2022"/>
**Corrected Na = Measured Na + [1.6 × (glucose – 100) / 100]
 
===Monitoring During DKA Treatment (Prevention)===
 
*Hourly neurologic assessments for the first 12 hours of DKA therapy (minimum), including cranial nerves<ref name="ISPAD2022"/>
**Increase frequency to q30min in children <5 years or with pH <7.1
*Avoid [[Special:MyLanguage/sodium bicarbonate|bicarbonate]] administration<ref name="Glaser2001"/>
*Follow corrected sodium — should trend upward during treatment<ref name="ISPAD2022"/>
 
 
==Management<ref name="ISPAD2022"/><ref name="Cooke"/>==
 
'''Treat IMMEDIATELY when suspected — do not wait for imaging'''
 
===Immediate Actions===
 
*Elevate head of bed to 30 degrees
*Reduce IVF rate by one-third
*'''Avoid intubation unless absolutely necessary''' (loss of hyperventilatory drive worsens cerebral edema)<ref name="ISPAD2022"/>
**If intubation is required, maintain pCO₂ near pre-intubation level — '''avoid aggressive hyperventilation''' (associated with worse outcomes)<ref name="Marcin2002">Marcin JP, Glaser N, Barnett P, et al. Factors associated with adverse outcomes in children with diabetic ketoacidosis-related cerebral edema. J Pediatr. 2002;141(6):793-797.</ref>
 
===Hyperosmolar Therapy===
 
*'''Give whichever agent is immediately available — do NOT delay treatment'''<ref name="BSPED">BSPED Guideline for the Management of Children and Young People under the age of 18 years with Diabetic Ketoacidosis. 2021.</ref>
*[[Special:MyLanguage/Mannitol|Mannitol]] 0.5-1 g/kg IV over 20 minutes<ref name="ISPAD2022"/>
**May repeat in 30 min to 2 hours if inadequate response
**Historically the most commonly used agent; best studied in this specific population
**Disadvantage: causes osmotic diuresis (may worsen dehydration)
*[[Special:MyLanguage/Hypertonic saline|3% Hypertonic saline]] 3-5 mL/kg (or 250 mL) IV over 15-30 minutes<ref name="ISPAD2022"/><ref name="BSPED"/>
**Increasingly used in pediatric ICU settings
**One retrospective study (DeCourcey 2013) found hypertonic saline as sole agent was associated with higher mortality than mannitol alone (OR 2.71), though this had significant limitations<ref name="DeCourcey2013">DeCourcey DD, Steil GM, Wypij D, Agus MS. Increasing use of hypertonic saline over mannitol in the treatment of symptomatic cerebral edema in pediatric diabetic ketoacidosis: an 11-year retrospective analysis of mortality. Pediatr Crit Care Med. 2013;14(7):694-700.</ref>
*If initial therapy is ineffective, give the other agent (i.e., if mannitol given first, try 3% saline; and vice versa)<ref name="ISPAD2022"/>
 
===Additional Measures===
 
*Consult [[Special:MyLanguage/neurosurgery|neurosurgery]] and PICU/ICU immediately
*Treat noncardiogenic [[Special:MyLanguage/pulmonary edema|pulmonary edema]] if present
*Hold insulin infusion during acute treatment of cerebral edema (the priority shifts to managing intracranial pressure)
*Consider [[Special:MyLanguage/intracranial pressure monitoring|ICP monitoring]] in consultation with neurosurgery


==Management<ref>Cooke & Plotnick. Management of diabetic ketoacidosis in children and adolescents. Pediatr Rev. 2008 Dec;29(12):431-5</ref>==
*Head of bed at 30 degrees
*Mannitol 0.5-1gm/kg IV bolus over 20 minutes
**Give a repeat does if there is an inadequate response
**If 2 doses of mannitol are ineffective, consider 3% saline 10mL/kg over 30min
*Fluid restriction - decrease the IVF infusion rate by 30%
**Treat noncardiogenic [[pulmonary edema]], if present
*Consult PICU and neurosurgery


==Disposition==
==Disposition==
Admit PICU/ICU
 
*Admit PICU/ICU — all patients
*Mortality remains high (21-24%) even with treatment; early recognition and treatment provides the best chance for good outcomes<ref name="ISPAD2022"/>
 
 
==Pearls==
 
*Cerebral edema is a CLINICAL diagnosis — treat first, image after
*Use the Muir criteria (not just GCS) for early detection — 92% Sn, 96% Sp
*Perform and document a thorough neuro exam at the start of DKA treatment so changes can be identified
*The old dogma that "rapid IVF causes cerebral edema" has been disproven by the PECARN FLUID trial<ref name="PECARN"/>
*'''Never give bicarbonate''' in pediatric DKA — it is an independent risk factor for cerebral edema<ref name="Glaser2001"/>
*Give whichever osmolar agent (mannitol or 3% saline) is '''immediately available''' — do not delay searching for one over the other
*If you must intubate, '''match the pre-intubation pCO₂''' — iatrogenic normalization of CO₂ worsens cerebral edema
*A child improving from DKA who suddenly deteriorates = cerebral edema until proven otherwise
 


==See Also==
==See Also==
*[[Diabetes mellitus (main)]]
 
*[[DKA]]
*[[Special:MyLanguage/Diabetes mellitus (main)|Diabetes mellitus (main)]]
*[[DKA (Peds)]]
*[[Special:MyLanguage/DKA|DKA]]
*[[Special:MyLanguage/DKA (Peds)|DKA (Peds)]]
*[[Special:MyLanguage/Cerebral edema|Cerebral edema]]
*[[Special:MyLanguage/Herniation syndromes|Herniation syndromes]]
 


==References==
==References==
<references/>
{{Reflist|2}}
 
[[Category:Endocrinology]]
[[Category:Endocrinology]]
[[Category:Neurology]]
[[Category:Neurology]]
[[Category:Critical Care]]
</translate>

Revisión actual - 09:26 22 mar 2026


Background

  • Most feared complication of pediatric DKA; accounts for 50-65% of all DKA deaths[1]
  • Occurs in 0.5-1% of pediatric DKA episodes (up to 4-5% with subclinical edema on imaging)[2][3]
  • Mortality rate: 21-24%; significant neurologic morbidity (10-26%) in survivors[1][4]
  • Almost all affected patients are <20 years old[3]
  • Mental status abnormalities (GCS <14) occur in 4-15% of children treated for DKA and are often associated with mild cerebral edema on imaging[1]

Pathophysiology

  • Previously attributed to osmotic shifts with rapid IV fluid administration; this model has been largely disproven
  • Current understanding favors cerebral hypoperfusion and reperfusion injury during DKA treatment as the primary mechanism[5][1]
  • Cerebral edema has been found on imaging even before treatment is initiated, including in children found dead at home from undiagnosed DKA[1]
  • Bicarbonate administration is independently associated with cerebral edema (persists after correcting for DKA severity) — avoid bicarbonate in pediatric DKA[6]

Risk Factors

  • Age <5 years
  • New-onset diabetes (first DKA presentation)
  • Severe acidosis (pH <7.1, pCO₂ <20)
  • Higher BUN at presentation (marker of dehydration severity)[6]
  • Failure of corrected sodium to rise with treatment[6]
  • Severe hyperosmolality
  • Bicarbonate administration[6]
  • Late presentation for medical evaluation
  • Previous episodes of DKA
  • Overaggressive fluid resuscitation is NOT a proven risk factor — the PECARN FLUID trial (1,389 episodes) showed neither fluid rate nor sodium content significantly affected neurologic outcomes[5]


Clinical Features

  • Typically begins 4-12 hours after onset of therapy, but may occur before treatment or up to 48 hours later[1]
    • Many children appear to be improving from DKA before deteriorating from cerebral edema
    • Can occur at presentation in new-onset diabetes (including type 2)[1]

Warning Signs (use Muir Criteria for early detection)

Diagnostic criteria (any ONE is diagnostic):[4]

  • Abnormal motor or verbal response to pain
  • Decorticate or decerebrate posture
  • Cranial nerve palsy (especially III, IV, VI)
  • Abnormal neurogenic respiratory pattern (grunting, tachypnea, Cheyne-Stokes, apneusis)

Major criteria:[4]

  • Altered mentation / fluctuating level of consciousness
  • Sustained heart rate deceleration (>20 bpm decrease) not attributable to improved intravascular volume or sleep
  • Age-inappropriate incontinence

Minor criteria:[4]

  • Vomiting
  • Headache
  • Lethargy or difficulty arousing
  • Diastolic BP >90 mmHg
  • Age <5 years

Interpretation: 1 diagnostic criterion, OR 2 major criteria, OR 1 major + 2 minor criteria → 92% sensitivity and 96% specificity for cerebral edema[4]

  • GCS alone is not sensitive enough — use the Muir criteria above[4]
  • Perform a thorough baseline neurologic exam (including cranial nerves) at presentation and document it so colleagues can identify changes


Differential Diagnosis

Hyperglycemia

Diabetic Emergencies

Diabetes Mellitus (New or Known)

Medication/Drug-Induced

Physiologic Stress Response

  • Sepsis / critical illness (stress hyperglycemia — very common in the ED)
  • Trauma / major surgery / burns
  • Acute coronary syndrome / myocardial infarction
  • Stroke (especially hemorrhagic)
  • Pancreatitis (both a cause and consequence)
  • Shock (any etiology)
  • Pain (catecholamine surge)
  • Seizure (postictal)
  • Physiologic stress alone rarely causes glucose >200 mg/dL in non-diabetics; glucose >200 in a "stress response" should prompt evaluation for undiagnosed diabetes or prediabetes

Endocrine

Pancreatic

  • Pancreatitis (acute or chronic — destruction of islet cells)
  • Pancreatic malignancy (adenocarcinoma, neuroendocrine tumors)
  • Post-pancreatectomy
  • Cystic fibrosis-related diabetes
  • Hemochromatosis (iron deposition in pancreas — "bronze diabetes")

Toxic/Overdose

Other

  • Renal failure (chronic kidney disease, acute kidney injury — impaired insulin clearance AND insulin resistance)
  • Cirrhosis / hepatic failure (impaired glycogenolysis regulation)
  • Pregnancy (gestational diabetes, steroid administration for fetal lung maturity)
  • Parenteral nutrition (TPN, dextrose-containing fluids)
  • Post-transplant diabetes (immunosuppressants)

Complications of Diabetes (Not Causes of Hyperglycemia)

These are associated conditions that may be present alongside hyperglycemia but do not themselves cause elevated glucose:


Evaluation

  • Cerebral edema in DKA is a CLINICAL diagnosis — do NOT delay treatment for imaging[1][4]
  • Capillary glucose measurement immediately to rule out hypoglycemia as the cause of altered mental status
  • Head CT (non-contrast) — obtain after treatment has been initiated, NOT before[1]
    • CT may be normal early (sensitivity is limited); used primarily to rule out other pathology (hemorrhage, thrombosis)
    • CT may show diffuse cerebral edema, small ventricles, or loss of sulcal markings
  • Monitor corrected sodium during DKA treatment — failure of corrected sodium to rise as glucose falls suggests excess free water and increased risk[6][1]
    • Corrected Na = Measured Na + [1.6 × (glucose – 100) / 100]

Monitoring During DKA Treatment (Prevention)

  • Hourly neurologic assessments for the first 12 hours of DKA therapy (minimum), including cranial nerves[1]
    • Increase frequency to q30min in children <5 years or with pH <7.1
  • Avoid bicarbonate administration[6]
  • Follow corrected sodium — should trend upward during treatment[1]


Management[1][2]

Treat IMMEDIATELY when suspected — do not wait for imaging

Immediate Actions

  • Elevate head of bed to 30 degrees
  • Reduce IVF rate by one-third
  • Avoid intubation unless absolutely necessary (loss of hyperventilatory drive worsens cerebral edema)[1]
    • If intubation is required, maintain pCO₂ near pre-intubation level — avoid aggressive hyperventilation (associated with worse outcomes)[7]

Hyperosmolar Therapy

  • Give whichever agent is immediately available — do NOT delay treatment[8]
  • Mannitol 0.5-1 g/kg IV over 20 minutes[1]
    • May repeat in 30 min to 2 hours if inadequate response
    • Historically the most commonly used agent; best studied in this specific population
    • Disadvantage: causes osmotic diuresis (may worsen dehydration)
  • 3% Hypertonic saline 3-5 mL/kg (or 250 mL) IV over 15-30 minutes[1][8]
    • Increasingly used in pediatric ICU settings
    • One retrospective study (DeCourcey 2013) found hypertonic saline as sole agent was associated with higher mortality than mannitol alone (OR 2.71), though this had significant limitations[9]
  • If initial therapy is ineffective, give the other agent (i.e., if mannitol given first, try 3% saline; and vice versa)[1]

Additional Measures

  • Consult neurosurgery and PICU/ICU immediately
  • Treat noncardiogenic pulmonary edema if present
  • Hold insulin infusion during acute treatment of cerebral edema (the priority shifts to managing intracranial pressure)
  • Consider ICP monitoring in consultation with neurosurgery


Disposition

  • Admit PICU/ICU — all patients
  • Mortality remains high (21-24%) even with treatment; early recognition and treatment provides the best chance for good outcomes[1]


Pearls

  • Cerebral edema is a CLINICAL diagnosis — treat first, image after
  • Use the Muir criteria (not just GCS) for early detection — 92% Sn, 96% Sp
  • Perform and document a thorough neuro exam at the start of DKA treatment so changes can be identified
  • The old dogma that "rapid IVF causes cerebral edema" has been disproven by the PECARN FLUID trial[5]
  • Never give bicarbonate in pediatric DKA — it is an independent risk factor for cerebral edema[6]
  • Give whichever osmolar agent (mannitol or 3% saline) is immediately available — do not delay searching for one over the other
  • If you must intubate, match the pre-intubation pCO₂ — iatrogenic normalization of CO₂ worsens cerebral edema
  • A child improving from DKA who suddenly deteriorates = cerebral edema until proven otherwise


See Also


References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 Glaser N, Fritsch M, Priyambada L, et al. ISPAD Clinical Practice Consensus Guidelines 2022: Diabetic ketoacidosis and hyperglycemic hyperosmolar state. Pediatr Diabetes. 2022;23(7):835-856. doi:10.1111/pedi.13406
  2. ↑ 2.0 2.1 Cooke & Plotnick. Management of diabetic ketoacidosis in children and adolescents. Pediatr Rev. 2008 Dec;29(12):431-5
  3. ↑ 3.0 3.1 Glaser NS, Wootton-Gorges SL, Buonocore MH, Marcin JP, Rewers A, Strain J, et al. Frequency of subclinical cerebral edema in children with diabetic ketoacidosis. Pediatr Diabetes. Apr 2006;7(2):75-80.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Muir AB, 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.
  5. ↑ 5.0 5.1 5.2 Kuppermann N, Ghetti S, Schunk JE, et al. Clinical Trial of Fluid Infusion Rates for Pediatric Diabetic Ketoacidosis. N Engl J Med. 2018;378(24):2275-2287. doi:10.1056/NEJMoa1716816
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Glaser N, Barnett P, McCaslin I, et al. Risk factors for cerebral edema in children with diabetic ketoacidosis. N Engl J Med. 2001;344(4):264-269.
  7. ↑ Marcin JP, Glaser N, Barnett P, et al. Factors associated with adverse outcomes in children with diabetic ketoacidosis-related cerebral edema. J Pediatr. 2002;141(6):793-797.
  8. ↑ 8.0 8.1 BSPED Guideline for the Management of Children and Young People under the age of 18 years with Diabetic Ketoacidosis. 2021.
  9. ↑ DeCourcey DD, Steil GM, Wypij D, Agus MS. Increasing use of hypertonic saline over mannitol in the treatment of symptomatic cerebral edema in pediatric diabetic ketoacidosis: an 11-year retrospective analysis of mortality. Pediatr Crit Care Med. 2013;14(7):694-700.
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