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Performance of the ABCD2 Score in a US Emergency Department Observation Unit.

Salvatore Lumia1, Wesley Iobst1, Zohayr Khan1

  • 1From the Department of Emergency Medicine, Wake Forest University School of Medicine, Winston-Salem, NC.

Critical Pathways in Cardiology
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Summary

The ABCD2 score is not reliable for ruling out stroke in emergency department observation units, as nearly 20% of low-risk patients experienced a stroke. This highlights the need for improved stroke risk assessment in these settings.

Keywords:
TIAemergency department observation unitrisk stratification

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Area of Science:

  • Neurology
  • Emergency Medicine
  • Cardiovascular Research

Background:

  • The ABCD2 score is a standard tool for assessing short-term stroke risk in transient ischemic attack (TIA) patients.
  • Its utility in emergency department observation units (EDOU) remains under-investigated.
  • This study evaluates the ABCD2 score's performance in a US EDOU cohort.

Purpose of the Study:

  • To determine the safety and efficacy of the ABCD2 score in predicting stroke risk within 48 hours for patients in a US EDOU.
  • To assess the ABCD2 score's accuracy in stratifying patients with suspected TIA.

Main Methods:

  • An observational cohort study was conducted on 340 patients evaluated for TIA in an EDOU.
  • Patients were risk-stratified using the ABCD2 score (low, moderate, high risk).
  • Primary safety outcome was index encounter stroke; efficacy assessed by proportion of low-risk patients.

Main Results:

  • 21.8% of patients were diagnosed with acute stroke during their index visit.
  • The ABCD2 score classified 45.0% as low-risk, but 17.7% of these experienced an index stroke.
  • The score demonstrated a low negative predictive value (63.5%) and a high rate of missed strokes in the low-risk group.

Conclusions:

  • The ABCD2 score is not suitable for ruling out acute stroke in EDOU patients.
  • A significant proportion of patients classified as low-risk had an acute stroke, indicating potential for missed diagnoses.
  • Current risk stratification may lead to under-triage and delayed treatment for TIA patients in EDOU settings.