Clinical MRI interpretation for outcome prediction in cardiac arrest
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Published on: April 14, 2023
David Greer1, Patricia Scripko, James Bartscher
1Department of Neurology, Yale University School of Medicine, LLCI 912, 15 York Street, New Haven, CT 06520, USA. david.greer@yale.edu
Background:
In clinical practice, magnetic resonance imaging (MRI) is commonly used to assess the severity of a cardiac arrest patient's cerebral injury, utilizing treating neurologists' imaging interpretation. We sought to determine whether clinical interpretation of diffusion-weighted imaging (DWI) helps to determine poor outcome in comatose cardiac arrest patients.
Methods:
We analyzed 80 consecutive MRIs from patients in coma following cardiac arrest. Each study was graded as "normal" or "abnormal restricted diffusion" in pre-specified brain regions by two blinded stroke neurologists. Poor outcome was defined as a modified Rankin Scale (mRS) score >4 at 3 months. Formal interpretations of neuroimaging by non-blinded neuroradiologists were compared with the blinded reviews by the stroke neurologists.
Results:
DWI abnormalities were highly sensitive (98.5 %) but only modestly specific (46.2 %) for predicting poor neurological outcome. Inter-observer reliability was moderate (kappa = 0.49 ± 0.32), with 91 % agreement between study observers, and no significant differences in study observers' interpretations (p = 0.125). There were, however, significant differences between the study observers and the clinical neuroradiologists in identifying studies showing evidence of global hypoxic-ischemic injury (p = 0.001).
Conclusions:
The qualitative evaluation of imaging abnormalities by stroke physicians in comatose cardiac arrest patients is a highly sensitive method of predicting poor outcome, but with limited specificity.
Insights
Diffusion-weighted imaging (DWI) interpretation by neurologists is highly sensitive for predicting poor outcomes in comatose cardiac arrest patients. However, its specificity is limited, requiring careful consideration in clinical practice.
Area of Science:
- Neurology
- Radiology
- Critical Care Medicine
Background:
- Magnetic resonance imaging (MRI) is crucial for assessing cerebral injury in cardiac arrest survivors.
- Clinical interpretation of MRI by neurologists is standard practice.
- The utility of diffusion-weighted imaging (DWI) in predicting outcomes needs further evaluation.
Purpose of the Study:
- To determine if clinical interpretation of DWI aids in predicting poor neurological outcomes in comatose cardiac arrest patients.
- To compare blinded DWI interpretations by neurologists with formal neuroradiologist interpretations.
Main Methods:
- Analysis of 80 MRIs from comatose cardiac arrest patients.
- Two blinded neurologists graded DWI for restricted diffusion in predefined brain regions.
- Poor outcome defined as modified Rankin Scale (mRS) score >4 at 3 months.
Main Results:
- DWI abnormalities showed high sensitivity (98.5%) but low specificity (46.2%) for poor neurological outcome.
- Moderate inter-observer reliability (kappa = 0.49) with 91% agreement.
- Significant differences noted between neurologists' and neuroradiologists' interpretations of hypoxic-ischemic injury.
Conclusions:
- Qualitative DWI assessment by neurologists is highly sensitive for predicting poor outcomes in comatose cardiac arrest patients.
- The specificity of this method is limited.
- Discrepancies exist between blinded neurologist and clinical neuroradiologist interpretations.
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