Ver el código de «Cerebral edema in DKA»

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==Background==

*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>
*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===

*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
*Bicarbonate administration<ref name="Glaser2001"/>
*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<ref name="PECARN"/>


==Clinical Features==

*Typically begins 4-12 hours after onset of therapy, but may occur before treatment or up to 48 hours later<ref name="ISPAD2022"/>
**Many children appear to be improving from DKA before deteriorating from cerebral edema
**Can occur at presentation in new-onset diabetes (including type 2)<ref name="ISPAD2022"/>

===Warning Signs (use Muir Criteria for early detection)===

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==

{{Hyperglycemia DDX}}

*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"/>


==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


==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<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==

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


==References==
{{Reflist|2}}
[[Category:Endocrinology]]
[[Category:Neurology]]
[[Category:Critical Care]]
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