Sequence-specific MR imaging findings that are useful in dating ischemic stroke

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Patients with ischemic stroke often present for care weeks after symptom onset, particularly the elderly or those in nursing homes.
• Accurate determination of stroke age is clinically significant for patient management, family understanding, and medical team planning.
• Perfusion imaging is not always performed, necessitating alternative methods for infarct dating.

Purpose of the Study:

• To explore the utility of pulse sequence-specific magnetic resonance (MR) imaging findings in determining the age of ischemic cerebral infarcts.
• To highlight the importance of accurate stroke dating for clinical decision-making, especially regarding time-sensitive treatments.

Main Methods:

• Analysis of MR imaging findings across various sequences, including apparent diffusion coefficient mapping, diffusion-weighted imaging, FLAIR, T1- and T2-weighted gradient-echo, and susceptibility-weighted imaging.
• Classification of cerebral infarcts into age categories: early hyperacute, late hyperacute, acute, subacute, and chronic.

Main Results:

• Specific MR imaging findings can help differentiate between various stages of ischemic stroke.
• Restricted diffusion with no FLAIR changes may indicate a stroke less than 6 hours old.
• Accurate dating is critical for adherence to treatment time windows for intravenous (4.5 hours) and intraarterial (6 hours) tissue plasminogen activator.

Conclusions:

• Pulse sequence-specific MR imaging findings offer valuable insights into the age of ischemic cerebral infarcts when perfusion imaging is unavailable.
• Precise infarct dating using MR imaging is essential for optimizing patient outcomes by ensuring timely administration of thrombolytic therapy within established time windows.