Introduction
A transient ischaemic attack (TIA) is an acute episode of focal neurological dysfunction caused by temporary disruption of blood flow to the brain, spinal cord or retina, without evidence of acute infarction. Although symptoms resolve, a TIA is an important warning sign of potential future stroke and requires urgent assessment. [1]
Key Clinical Differences
An ischaemic stroke occurs when a blood vessel supplying the brain is blocked, resulting in brain tissue infarction. A haemorrhagic stroke occurs when a blood vessel ruptures and causes bleeding in or around the brain. In contrast, a TIA produces transient neurological symptoms without acute infarction.
Both TIA and stroke may present with sudden facial drooping, weakness or numbness on one side, speech difficulties, visual disturbances or loss of balance. Symptom resolution alone cannot reliably distinguish a TIA from a stroke; brain imaging is essential when clinically indicated. [1,2]
Why Early Assessment Matters
TIA should be treated as a medical emergency. The risk of subsequent stroke is particularly concerning in the hours and days following an episode. Clinical evaluation should include a detailed history, neurological examination, brain imaging and assessment of cerebral and cervical blood vessels. Cardiac evaluation, including screening for atrial fibrillation, may also help identify the underlying cause. MRI with diffusion-weighted imaging is particularly useful for detecting acute infarction when available. [1]
Prevention and Clinical Management
Management focuses on identifying the cause and reducing the risk of a subsequent stroke. Depending on the findings, interventions may include appropriate antithrombotic therapy, management of hypertension and diabetes, lipid-lowering treatment, smoking cessation and treatment of underlying cardiac or vascular conditions. Treatment should be individualised following clinical assessment and exclusion of contraindications. [1,3]
Key Takeaway
A TIA is not a condition to observe and ignore. Even when symptoms resolve completely, urgent assessment and timely secondary prevention are essential to reduce the risk of a subsequent stroke.
Educational content for healthcare professionals. Clinical decisions should be guided by current evidence and individual patient assessment.