Ep 207 – Transient ischaemic attack

In this episode, Dr Roger Henderson looks at one of the most time-sensitive diagnoses in general practice: the transient ischaemic attack, or TIA. Often underestimated because symptoms resolve quickly, a TIA is in fact a powerful warning sign of an impending ischaemic stroke. For GPs, recognising and responding to this brief neurological event can make the difference between prevention and long-term disability. Here we break down the modern tissue-based definition of TIA, highlighting how it differs from older time-based concepts and why that matters in our clinical practice. We also explore the importance of sudden focal symptoms and discuss why the first 48 hours carry the greatest risk. We also look at key causes and outline practical approaches to urgent evaluation, risk stratification and management.

Key take-home points

• A TIA is a brief episode of neurological dysfunction caused by ischaemia without permanent tissue injury.
• The definition of TIA is now tissue-based rather than time-based, reflecting the absence of infarction rather than symptom duration.
• TIAs usually last minutes and rarely exceed 1 hour, but even very short episodes are clinically significant.
• TIA is a medical emergency because it signals a high risk of imminent ischaemic stroke, especially within the first 48 hours.
• Up to 10% of patients may develop a stroke within 3 months, and about half of these occur within the first 2 days. Early recognition and intervention are therefore critical.
• Symptoms are sudden in onset and focal, commonly involving weakness, speech disturbance or visual loss.
• Differentiating TIA from mimics like migraine with aura or seizures is essential, as TIA typically causes negative (loss of function) symptoms.
• Hypertension is the most important modifiable risk factor, followed by diabetes, smoking and sedentary lifestyle.
• Common aetiologies include large artery disease, small vessel disease and cardioembolism, especially from atrial fibrillation.
• Evaluation should be urgent and comprehensive, including brain imaging, vascular studies, cardiac assessment and laboratory tests.
• MRI with diffusion-weighted imaging is more sensitive than computed tomography (CT) for detecting small infarcts and should be performed within 24 hours when possible.
• Immediate treatments include antiplatelet therapy, statins, blood pressure control and lifestyle modification, often in combination. Dual antiplatelet therapy may be used short term in selected patients.
• Early, aggressive and targeted management can reduce the risk of subsequent stroke by up to 80% or more.
• Identifying and treating the underlying cause is essential for long-term prevention.

Key references

1. NICE. 2022. https://www.nice.org.uk/guidance/ng128.
2. National Clinical Guideline for Stroke. 2023. https://www.strokeguideline.org/app/uploads/2023/04/National-Clinical-Guideline-for-Stroke-2023.pdf.
3. Amarenco P. N Engl J Med. 2020;382(20):1933-1941. doi: 10.1056/NEJMcp1908837.
4. Dawson J, et al. Eur Stroke J. 2022;7(3):I-II. doi: 10.1177/23969873221100032.
5. Khan F, et al. JAMA. 2025;333(17):1508-1519. doi: 10.1001/jama.2025.2033.