MRI guides diagnostic approach for ischaemic stroke

Area of Science:

• Neurology
• Radiology
• Cardiology

Background:

• Accurate identification of ischaemic stroke subtype is crucial for effective treatment.
• Current diagnostic methods rely on clinical evaluation and various imaging studies.
• Diffusion-weighted MRI (DWI) patterns offer potential for improved etiological classification.

Purpose of the Study:

• To evaluate if specific DWI patterns on MRI can reliably guide the diagnostic work-up for acute ischaemic stroke.
• To compare the effectiveness of MRI-based versus CT-based classification schemas in determining stroke subtypes.
• To assess the potential of an MRI-based algorithm to streamline diagnostic procedures.

Main Methods:

• Prospective, observational study of 273 patients with acute ischaemic stroke symptoms.
• Sequential diagnostic work-up including ECG, CT, MRI, MRA, and transoesophageal echocardiography.
• Comparison of initial and final TOAST (Trial of Org 10172 in Acute Stroke Treatment) classifications and identification of principal determinants of diagnostic change.

Main Results:

• DWI patterns were more predictive of stroke aetiologies compared to conventional methods.
• Transoesophageal echocardiography was a significant determinant of diagnostic change in patients with thromboembolic DWI patterns (8.8%).
• An MRI-based scheme showed potential to reduce the need for echocardiography and secondary extracranial vascular imaging.

Conclusions:

• Specific DWI patterns on MRI can accurately predict stroke aetiologies.
• An MRI-based diagnostic algorithm can potentially obviate the need for echocardiography in one-third of stroke patients.
• This approach may limit secondary extracranial vascular imaging studies to approximately 10%.