Neuro: Anterior Spinal Artery Syndrome: Free MSRA Podcast

⚕️ FREE MSRA PODCAST – Anterior Spinal Artery Syndrome🎧 In this episode, we break down a rare but high-yield neurology topic: anterior spinal artery syndrome (ASAS) – a condition marked by sudden motor weakness, loss of pain and temperature sensation, but preserved proprioception. Designed for fast, focused MSRA revision.🧠 Key Learning Points📌 Definition• Anterior spinal artery syndrome (ASAS) is caused by ischaemia or infarction of the anterior two-thirds of the spinal cord.• Results in motor deficits and loss of pain & temperature sensation, but preservation of vibration and proprioception.• Classic example of a “sensory dissociation” pattern.📌 Causes & Risk Factors• Common causes include:Atherosclerosis (most common)Aortic dissection or aneurysmSpinal trauma or surgeryExternal compression (e.g. tumour, herniated disc)VasculitisHypotension or embolism• Risk factors:Advanced ageCardiovascular disease (e.g. hypertension, diabetes, AF)Smoking, hyperlipidaemiaPrevious spinal or vascular trauma📌 Pathophysiology• The anterior spinal artery supplies the spinothalamic tracts (pain/temp), corticospinal tracts (motor), and autonomic fibres.• Occlusion → ischaemia → infarction → sudden loss of function in these areas.• Posterior columns spared, explaining preserved vibration and position sense.📌 Symptoms• Sudden onset of symptoms (within minutes to hours)• Bilateral weakness/paralysis below lesion• Loss of pain and temperature sensation• Bladder/bowel dysfunction• Autonomic instability: hypotension, sweating issues• ⚠️ Proprioception and vibration preserved – crucial diagnostic clue• May be preceded by sudden back pain at level of infarction📌 Differential Diagnosis• Spinal cord compression (e.g. tumour, epidural abscess)• Transverse myelitis• Guillain-Barré syndrome (though it’s peripheral)• Spinal cord infarcts from other arterial sources• Use MRI to rule out compression or inflammatory conditions• Mnemonic: "STG" – Spinal compression, Transverse myelitis, Guillain-Barré📌 Diagnosis• Clinical exam + MRI spine = gold standard• Look for “Owl’s Eye” sign on T2 MRI – symmetrical hyperintensity in anterior cord• Additional tests:FBC, U&Es, clotting, autoimmune screenLumbar puncture (rule out infection/inflammation)Spinal angiography (rarely used)📌 Management• No way to reverse cord infarction directly – supportive care is key• Time-sensitive thrombolysis may be considered in select cases (<4.5 hours)• Medical options:Antiplatelets (e.g. aspirin)Anticoagulants (if embolic cause suspected)Fluids & vasopressors for hypotensionConsider steroids in inflammatory causes• Non-prescribing management:DVT prophylaxis, catheterisationIntense rehabilitation – physio, OT, possibly speech therapyRespiratory support if high cervical cord affectedMultidisciplinary input: neuro, rehab, nursing, psychology📌 Prognosis & Complications• Guarded prognosis – complete recovery rare• Complications:Permanent motor/sensory deficitsBladder, bowel, and sexual dysfunctionOrthostatic hypotensionPressure sores, DVT/PE, chronic painPsychological impact: depression, anxiety• Early rehab = better long-term outcomes📎 More MSRA Resources for Anterior Spinal Artery Syndrome📝 Revision Notes: https://www.passthemsra.com/topic/anterior-spinal-artery-syndrome-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/anterior-spinal-artery-syndrome-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/anterior-spinal-artery-syndrome-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/anterior-spinal-artery-syndrome-rapid-quiz/🎓 Full Neurology Course: https://www.passthemsra.com/courses/neurology-for-the-msra/Hashtags#MSRA #AnteriorSpinalArterySyndrome #MSRARevision #MSRAQuiz #MSRAFlashcards #MSRATextbook #MSRAQandANotes #MSRAAccordions #NeurologyMSRA #MSRAOnlineRevision #MultiSpecialtyRecruitmentAssessment