Differential diagnosis of cerebral infarction using an algorithm combining atrial fibrillation and D-dimer level
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Published on: September 25, 2019
N Dougu1, S Takashima, E Sasahara
1Department of Neurology, Toyama University Hospital, Toyama, Japan.
Insights
An algorithm combining atrial fibrillation (AF) and D-dimer levels aids in diagnosing acute cerebral infarction (CI) subtypes. This method accurately differentiates cardioembolic from other CI types, improving diagnostic precision during the critical early stages.
Area of Science:
- Neurology
- Cardiology
- Hematology
Background:
- Accurate diagnosis of cerebral infarction (CI) subtypes is crucial for effective acute-stage treatment.
- Distinguishing between cardioembolic and atherothrombotic causes of CI is clinically significant.
- Current diagnostic methods may have limitations in rapidly identifying CI subtypes.
Purpose of the Study:
- To develop and validate an algorithm for diagnosing cerebral infarction subtypes.
- To integrate atrial fibrillation (AF) status and D-dimer levels for improved diagnostic accuracy.
- To differentiate cardioembolic infarction from other CI subtypes in the acute phase.
Main Methods:
- Retrospective analysis of 108 acute CI patients to develop the diagnostic algorithm.
- Prospective validation of the algorithm in 259 consecutive acute CI patients.
- Classification of CI into cardioembolic, atherothrombotic, lacunar, or other subtypes based on clinical data, AF history, and D-dimer levels.
Main Results:
- The algorithm identified cardioembolic infarction in 82% of patients with atrial fibrillation (AF).
- In non-AF patients, cardioembolic infarction was rare (<2%) with D-dimer <1.6 microg/ml, while atherothrombotic infarction was associated with elevated D-dimer (41%).
- Prospective validation demonstrated high sensitivity (89%) and negative predictive value (94%) for the algorithm.
Conclusions:
- Combining D-dimer levels with AF status provides a useful tool for distinguishing cerebral infarction subtypes.
- The developed algorithm offers a practical approach to acute CI subtype diagnosis.
- This diagnostic strategy can aid in guiding treatment decisions for acute cerebral infarction.
Abstract:
We created an algorithm for diagnosing subtypes of cerebral infarction (CI) during the acute stage by combining atrial fibrillation (AF) and D-dimer levels. One-hundred and eight patients hospitalized for acute CI were retrospectively analyzed. CI was classified into cardioembolic, atherothrombotic, lacunar infarction or others. Patients were classified in AF group if they had AF on admission or a prior history of AF. This group was diagnosed to suffer cardioembolic infarction. In non-AF group, cardioembolic infarction was diagnosed when D-dimer level exceeded the cutoff point determined using a receiver operating curve. Then, usefulness of the algorithm was validated prospectively in 259 consecutive patients with acute CI. For the retrospective group, cardioembolic infarction was found in 82% of the AF group. In non-AF group, cardioembolic infarction was found in only 2%, when D-dimer level was <1.6 microg/ml. However, 41% of non-AF group with atherothrombotic infarction had elevated D-dimer level (> or =1.6 microg/ml). Results for the validation group were similar to those for the retrospective group (sensitivity, 89%; specificity, 66%; positive predictive value, 50%; and negative predictive value, 94%). D-dimer level in combination with AF can be useful for distinguishing CI subtypes during the acute stage.
