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Thalamic Strokes
Related Subjects: |Acute Stroke Assessment (ROSIER&NIHSS) |Atrial Fibrillation |Atrial Myxoma |Causes of Stroke |Ischaemic Stroke |Cancer and Stroke |Cardioembolic stroke |CT Basics for Stroke |Endocarditis and Stroke |Haemorrhagic Stroke |Stroke Thrombolysis |Hyperacute Stroke Care
A thalamic stroke occurs when blood flow to the thalamus is interrupted. This deep brain structure is a relay hub for sensory, motor, visual, and cognitive signals. Although relatively rare, thalamic strokes cause a wide spectrum of clinical deficits - from hemianesthesia to cognitive and behavioural syndromes. They can be either ischaemic (most often small vessel disease) or haemorrhagic.
🩸 Anatomy & Vascular Supply
The thalamus is supplied by small perforating arteries from the PCA & PComA:
- Paramedian Arteries: P1 PCA, sometimes via Artery of Percheron → bilateral infarcts.
- Thalamogeniculate Arteries: From PCA → lateral thalamus.
- Posterior Choroidal Arteries: Posterior thalamus & choroid plexus.
- Tuberothalamic (Polar) Artery: From PComA → anterior thalamus.
⚠️ Etiology
- Ischaemic: Small vessel lipohyalinosis (HTN/DM), artery-to-artery or cardioembolism, artery of Percheron occlusion.
- Haemorrhagic: Hypertensive bleed, amyloid angiopathy, AVMs, cavernomas, haemorrhagic transformation.
- Other: Deep venous thrombosis, neoplasm infiltration.
🩺 Clinical Features
Depends on arterial territory - think “thalamic strokes = sensory + extras”:
- 🖐 Sensory loss: Contralateral hemianesthesia of all modalities.
- 💪 Motor weakness: If internal capsule fibres are compressed.
- 🔥 Thalamic pain (Dejerine–Roussy): Neuropathic pain weeks later.
- 👁 Visual field loss: Contralateral hemianopia/quadrantanopia.
- ⚖️ Ataxia & tremor: Limb incoordination, intention tremor.
- 👀 Oculomotor signs: Vertical gaze palsy, pupillary changes.
- 🛌 Consciousness changes: Drowsiness, coma (bilateral lesions).
- 🧩 Cognitive/behavioural: Memory loss, apathy, language disturbance (anterior thalamus).
📷 Imaging
- 🖥 Non-contrast CT: Exclude bleed; hyperdense thalamus = ICH.
- 🧲 MRI (DWI): Most sensitive for small infarcts, artery of Percheron lesions.
- 🩻 CTA / MRA: Vessel anatomy & occlusion detection.
- 📡 DSA: For suspected AVM/cavernoma.
🔍 Investigations
- 🧪 Bloods: CBC, U&E, glucose, lipid, coagulation.
- ❤️ Cardiac work-up: ECG (AF), echo (thrombus, PFO).
- 🩺 Vascular studies: Carotid Doppler if extracranial source suspected.
- 📊 Risk profiling: BP, HbA1c, cholesterol.
🚑 Management
Acute
- 🩹 Ischaemic: IV tPA (≤4.5 h), thrombectomy if large vessel, aspirin if no bleed.
- 🩸 Haemorrhagic: BP control, ICP management, ICU monitoring, rare surgical evacuation.
Secondary Prevention
- 💊 Antithrombotics: Antiplatelets or anticoagulants (if AF).
- 💊 Statins: LDL lowering, plaque stabilisation.
- 🩺 Risk factor control: HTN, DM, smoking, lifestyle change.
Rehabilitation
- 🏃 Physio: Motor retraining, gait recovery.
- 🖐 OT: ADL independence, adaptation.
- 🗣 Speech & swallow therapy when indicated.
- 🔥 Pain management: TCAs, gabapentinoids for central pain.
- 🧑🤝🧑 Psych support: Depression, anxiety screening.
📈 Prognosis
- ✅ Many unilateral strokes recover well with rehab.
- ⚠️ Persistent sensory loss, pain, cognitive change common.
- ☠️ Mortality higher in haemorrhagic forms or large bilateral infarcts.
📚 References
- Schmahmann JD. Vascular syndromes of the thalamus. Stroke. 2003.
- Kumral E, et al. Thalamic infarcts: findings, etiology, prognosis. Neurology. 1995.
- Guenego A, et al. Artery of Percheron infarct patterns. Neuroradiology. 2015.
- AHA/ASA Acute Stroke Guidelines. Stroke. 2019.