TIA - Transient Ischemic Attack
Any sudden, transient neurological episode should be considered a TIA or stroke until proven otherwise. Do not wait for symptoms to resolve completely before calling for emergency help. Every minute counts: the risk of a full stroke is highest in the hours following a TIA.
Do not drive yourself to the emergency room. Do not take any medication, including aspirin, before your initial evaluation, without medical advice.
What is the difference between a TIA and a stroke?
| Features | Artificial Intelligence | AVC constituted |
|---|---|---|
| Symptom duration | Less than 24 hours, most often less than 60 minutes | Persists beyond 24 hours or leaves sequelae |
| Brain lesion visible on MRI | Absent by definition (no formed infarction) | Infarct or necrosis area visible |
| Mechanism | Transient arterial occlusion with rapid spontaneous recanalization | Prolonged arterial occlusion with irreversible neuronal death |
| Recovery | Complete, without neurological sequelae | Partial or absent depending on severity and speed of care |
| Emergency | Yes, absolutely: a powerful predictor of imminent stroke | Yes, absolutely: every minute lost equals neurons lost. |
How to recognize a TIA? FAST Method
The symptoms of a TIA are identical to those of an early stroke. They occur suddenly, reach their maximum intensity within seconds to minutes, and resolve spontaneously. The method VITE allows for quick recognition:
| Letter | Sign to look for | Description |
|---|---|---|
| Face | Facial asymmetry | One side of the face droops, the mouth is pulled to the side, ask the person to smile |
| I – Arm immobility | Weakness or paralysis of a limb | An arm or leg won't lift or falls, sudden unilateral weakness |
| Speech disorders | Aphasia or dysarthria | Incomprehensible speech, incorrect words, inability to find words or understand |
| E - Extreme Urgency | Call 911 immediately | Even if the symptoms recede, urgent medical evaluation is essential |
Other symptoms may accompany or replace FAST signs in the context of a TIA:
- Sudden visual trouble: transient monocular vision loss (amaurosis fugax, often described as a curtain descending over one eye), double vision, loss of vision on one side of the visual field (hemianopsia).
- Sudden coordination or balance problems: ataxia, unsteady gait, unexplained falls
- Severe, sudden onset vertigo associated with other neurological signs (nausea, double vision, slurred speech)
- Sudden numbness or loss of sensation on one side of the body, face, arm, or leg
- Sudden and intense headache, like lightning, with no obvious cause (suggests subarachnoid hemorrhage to rule out).
- Sudden confusion or abrupt disorientation
What are the mechanisms and causes of a TIA?
| Mechanism | Description and main causes |
|---|---|
| Cardiac thromboembolism | A clot forms in the heart (atrial fibrillation, valvular disease, post-infarction intraventricular thrombus, endocarditis) and migrates to a cerebral artery, temporarily obstructing it before dissolving or migrating elsewhere. |
| Atheroembolic | Rupture of an atherosclerotic plaque in a cervical or cerebral artery (internal carotid, vertebral, aorta), releasing microemboli that transiently obstruct a distal artery. Most frequent cause of TIA |
| Lacunar (small vessels) | Occlusion of a small penetrating intracerebral artery due to lipohyalinosis related to chronic hypertension or diabetes |
| Hemodynamics | Cerebral hypoperfusion due to a tight upstream arterial stenosis during sudden hypotension (dehydration, arrhythmia) |
| Rare causes | Arterial dissection (carotid or vertebral), coagulation disorders (antiphospholipid syndrome, polycythemia, thrombocytosis), vasculitis, cocaine or other vasoconstrictive toxins |
What are the risk factors?
- High blood pressure: the leading modifiable risk factor, present in more than 70% of cases of stroke and TIA
- Atrial fibrillation: responsible for approximately 20% of embolic strokes, often asymptomatic and undiagnosed
- Type 2 diabetes: accelerates atherosclerosis and promotes small vessel damage
- Dyslipidemia: hypercholesterolemia promoting the formation of atherosclerotic plaques in the carotid and cerebral arteries
- Smoking: Doubles to Triples Stroke Risk, Synergistic Effect with Other Factors
- Personal history of TIA or stroke: High risk of recurrence, especially in the first 48 hours
- Advanced age: risk doubles every decade after 55
- Sedentary lifestyle and abdominal obesity
- Excessive alcohol consumption
- Untreated obstructive sleep apnea
- Combined oral contraceptives, especially when combined with smoking or migraines with aura
What is the assessment performed in the emergency room after a TIA?
- Brain MRI diffusion (DWI sequence): reference examination for detecting even a minor cerebral infarction, hemorrhage, or other lesion, ideally performed within the first few hours
- Doppler ultrasound of the carotid and vertebral arteries: search for atherosclerotic stenosis or arterial dissection as an embolic source
- 12-Lead Electrocardiogram (ECG): Detection of atrial fibrillation, block, or rhythmic anomaly
- Extended cardiac monitoring (24 to 72-hour ECG Holter, or even 4 weeks with an implantable sensor): detection of paroxysmal atrial fibrillation not identified on standard ECG
- Transthoracic or transesophageal echocardiogram: Search for embolic heart disease (thrombus, valvular disease, patent foramen ovale, vegetations)
- Biological workup: CBC, coagulation (PT, aPTT), blood glucose, HbA1c, complete lipid panel, creatinine, electrolytes, CRP, TSH
- Thrombophilia workup according to age and context: antiphospholipid antibodies, protein C and S, Factor V Leiden, particularly in young subjects without obvious cardiovascular risk factors
- ABCD2 Score: Clinical tool for short-term stroke risk assessment after TIA (Age, Blood Pressure, Clinical Features, Symptom Duration, Diabetes)
What is the treatment after a TIA?
| Treatment | Indication and purpose |
|---|---|
| Antiplatelets (aspirin, clopidogrel or combination) | First-line treatment for non-cardioembolic TIAs. Initiated urgently to reduce the risk of stroke within the first 48 hours. Dual antiplatelet therapy (aspirin + clopidogrel) is recommended in the acute phase for the first 21 days according to recent guidelines. |
| Oral anticoagulants (warfarin, dabigatran, rivaroxaban, apixaban) | Indicated in cases of atrial fibrillation or other identified embolic heart disease, as a replacement for antiplatelets. The timing of initiation depends on the size of the infarct and the risk of bleeding. |
| High-intensity statins | Reduction of the risk of recurrence by stabilizing atherosclerotic plaques and pleiotropic anti-inflammatory effect, independent of the initial LDL level |
| Antihypertensives | Strict blood pressure control, general target below 130/80 mmHg after the acute episode. Immediate blood pressure lowering in the acute phase is nuanced depending on the context. |
| Carotid endarterectomy or carotid stenting | Indicated for severe ipsilateral carotid stenosis (70–99% TPA). The procedure is ideally recommended within 2 weeks of a TIA to be effective in preventing stroke |
| Risk Factor Control | Smoking cessation imperative, optimal glycemic control (target HbA1c), sleep apnea treatment, gradually resumed adapted physical activity, Mediterranean diet |
What is the risk of stroke after a TIA?
The risk of stroke following a TIA is particularly high in the first few hours and days. Without urgent treatment, approximately 10 to 15% of patients who experience a TIA will have a stroke within the next 48 hours, and up to 20% within 90 days. This risk is significantly reduced through rapid and optimal care in a neurovascular unit, lowering mortality and disability by approximately 80% according to studies. A TIA should never be dismissed simply because symptoms have disappeared.
Consult at Clinique Omicron
If you have experienced a transient neurological episode and have already been evaluated at the emergency room, Clinique Omicron physicians, at their service points in Quebec, can provide post-TIA follow-up, coordinate further investigations, adjust your secondary prevention treatments, and refer you to a neurologist or vascular specialist if necessary. Preventing a stroke after a TIA relies on rigorous and sustained follow-up.
The content of this page is provided for informational purposes only and is not intended to replace the advice of a qualified healthcare professional. Consult a physician for any symptoms, questions or decisions you may have regarding your health.
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