Comatose After Cardiac Arrest
Patient remains unresponsive after ROSC
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NeurologyDiagnostic
Neuroprognostication After Cardiac Arrest
Neuroprognostication After Cardiac Arrest: Comatose After Cardiac Arrest → Post-Cardiac Arrest Care → Timing for Prognostication → ⚠️ Too Early → Clinic...
Pathway Overview
19 steps
Algorithm Steps
19 total
01Start 02Action Post-Cardiac Arrest Care
Optimize before prognostication
- Targeted temperature management (TTM)
- Hemodynamic optimization
- Treat seizures if present
- Continuous EEG monitoring
- Avoid premature WLST
03Decision Timing for Prognostication
When to assess?
- Wait ≥72 hours after ROSC
- Or ≥72 hours after rewarming if TTM used
- Ensure sedation cleared (5 half-lives)
- No residual paralytic effect
04Warning ⚠️ Too Early
Wait for appropriate timing
- Sedation confounds exam
- Early awakening still possible
- Do NOT withdraw support yet
- Continue supportive care
05Action Clinical Examination
Motor response and brainstem reflexes
- GCS Motor score (M1-M6)
- Pupillary light reflex (PLR)
- Corneal reflex
- Myoclonus/status myoclonus
- Best exam off sedation
06Decision Motor Response at 72h+
M ≤2 (extensor or absent)?
- M1: No response
- M2: Extensor posturing
- M3+: Better prognosis, continue observation
07Action Motor M3+ Present
More favorable sign
- Flexor or better response
- Continue observation
- May still have poor outcome
- But not reliable poor predictor
08Action Potentially Favorable
Good signs present
- Motor response improving
- Reactive EEG, sleep architecture
- Normal SSEP
- Continued supportive care
09Outcome Continue Care & Reassess
Daily neurological evaluation
10Action Motor M ≤2 at 72h+
Need multimodal assessment
- Single finding insufficient
- Proceed to additional testing
- Must have concordant findings
11Decision Pupillary Light Reflex
Bilateral absence at 72h+
- Absent PLR bilaterally: concerning
- FPR ~0% when combined with other findings
- Must exclude medications (opioids, etc.)
12Decision Integrate Multimodal Findings
≥2 concordant poor predictors?
- No single test sufficient
- Need multiple consistent findings
- Clinical exam + SSEP + EEG + imaging
- Biomarkers supportive
13Warning Poor Prognosis Likely
Multiple concordant poor predictors
- Absent PLR + absent SSEP N20 + malignant EEG
- Goals of care discussion indicated
- Involve family, palliative care
- Document thoroughly
14Outcome Goals of Care Discussion
Family meeting, ethics consult
15Action Indeterminate Prognosis
Conflicting or incomplete data
- Continue observation
- Repeat assessments over days-weeks
- Some patients awaken late
- Extended observation if any hope
- Path rejoins step 09Shared downstream outcome
- Path rejoins step 08Shared downstream outcome
16Action EEG Findings
Continuous EEG monitoring
- Highly malignant patterns:
- - Suppressed background
- - Suppression-burst (without sedation)
- - Status epilepticus (nonreactive)
- Benign patterns: reactivity, sleep architecture
17Action Serum Biomarkers
NSE levels
- Neuron-specific enolase (NSE)
- Check at 24h, 48h, 72h
- High levels (>60 µg/L) concerning
- Thresholds vary by assay
- Rising trend more concerning
- Path rejoins step 12Shared downstream outcome
18Action SSEP Testing
Somatosensory evoked potentials
- Bilateral absence of N20 cortical responses
- Very high specificity (FPR ~0-1%)
- Performed ≥24h post-ROSC
- Technical quality critical
- Most reliable single predictor
19Action Brain Imaging
CT or MRI findings
- CT: global cerebral edema (GWR)
- MRI DWI: extensive diffusion restriction
- Timing: CT early, MRI at 2-5 days
- Adjunctive to other findings
- Path rejoins step 12Shared downstream outcome
- Path rejoins step 05Shared downstream outcome
Guideline Source
Guidelines for Neuroprognostication in Comatose Adult Survivors of Cardiac Arrest - AAN/NCS
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Requires 72+ hours post-ROSC before prognostication
- Sedation must be cleared before exam
- Single predictor insufficient - multimodal required
- Pediatric cardiac arrest not covered
Contraindicated Populations
pediatric
Applicable Regions
USEUglobal
EU: ERC/ESICM 2021 algorithm similar
US: AAN/NCS 2023 guidelines
Version 1Next review: 2027-01-01
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Related Resources
Frequently Asked Questions
What is the Neuroprognostication After Cardiac Arrest?
The Neuroprognostication After Cardiac Arrest is a diagnostic clinical algorithm for Neurology. It provides a structured decision tree to guide clinical decision-making, based on Guidelines for Neuroprognostication in Comatose Adult Survivors of Cardiac Arrest - AAN/NCS.
What guideline is the Neuroprognostication After Cardiac Arrest based on?
This algorithm is based on Guidelines for Neuroprognostication in Comatose Adult Survivors of Cardiac Arrest - AAN/NCS (DOI: 10.1007/s12028-023-01688-3).
What are the limitations of the Neuroprognostication After Cardiac Arrest?
Known limitations include: Requires 72+ hours post-ROSC before prognostication; Sedation must be cleared before exam; Single predictor insufficient - multimodal required; Pediatric cardiac arrest not covered. Individual patient factors may require deviation from these recommendations.
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