MSK: Acute Limb Ischemia: Free MSRA Podcast

🎧 MSRA Deep Dive: Acute Limb Ischaemia — Every Second CountsToday we’re tackling Acute Limb Ischaemia (ALI) — a vascular emergency where time is tissue. Left untreated, ALI can lead to amputation or death within hours. This episode covers causes, clinical signs, key mnemonics, and urgent management — exactly what you need for the MSRA.🚨 What is ALI?ALI = sudden, severe ↓ in arterial limb perfusion, usually due to:• Thrombus (on atherosclerotic plaque)• Embolus (e.g. from atrial fibrillation)• Trauma or external compression🆘 A surgical emergency. Irreversible damage = ~6 hours.Compare with Critical Limb Ischaemia (chronic → ulcers, rest pain, gangrene).🧠 Causes — Mnemonic: AFAT• Atrial fibrillation• Faulty valves (prosthetic, endocarditis)• Aneurysms• Tumours/thrombi🧬 Also: Trauma, vasculitis, dissection, compartment syndrome📌 Risk FactorsAge >60 • AF • PAD • Diabetes • Smoking • Hypertension • Previous MI or stroke📉 PathophysiologyArterial occlusion → ↓ oxygen → tissue death🧬 Reperfusion can worsen injury (e.g. hyperkalaemia, acidosis, myoglobin)🩺 Clinical Features — Mnemonic: 6 P’sPain (sudden, severe)PulselessnessPallorPoikilothermia (cold limb)ParesthesiaParalysis (late, ominous)‼️ Paralysis or mottling = likely irreversible damage → amputation risk🧾 Differentials• DVT• Compartment syndrome• Nerve compression• Gout or cellulitis• MSK trauma🔍 Investigations• Doppler ultrasound – bedside pulses• CT angiography – occlusion site• ECG – look for AF• Bloods – FBC, U&Es, CK, glucose, clotting• Echo – search for embolic source🛠️ Management — Mnemonic: DR BOLT• Diagnose quickly• Refer to vascular surgery• Blood thinner – IV heparin immediately• Oxygen + analgesia• Limb viability assessment (Rutherford)• Treatment: – Thrombolysis (catheter-based) – Embolectomy (Fogarty catheter) – Bypass or angioplasty✂️ Non-viable limb ➝ Primary amputation📊 Rutherford Classification (Simplified)1️⃣ Viable — no threat2️⃣ Threatened — urgent intervention3️⃣ Irreversible — sensory/motor loss → amputation📈 Prognosis• Time critical: ⏱️ = outcome• Amputation rate: ~15–30%• 30-day mortality: ~20–25%• Cochrane: Surgery vs thrombolysis = similar 1-year outcome, but ↑ stroke risk with thrombolysis⚠️ Complications• Limb loss• Chronic ischaemia• Reperfusion injury → hyperkalaemia, AKI• Wound infection• Death🧠 MSRA Tips & Mnemonics• 6 P’s = core signs• AFAT = embolic causes• DR BOLT = management steps• Always check for AF, diabetes, trauma• Red, cold, pulseless = emergency🧪 Sample MSRA Q&A🟠 Cold, painful, pulseless leg in AF patient? → Arterial embolus🟠 No sensation/movement in pale leg? → Class III (irreversible) → Amputation likely📚 MSRA Resources on ALI📝 Revision Notes🃏 Flashcards📖 Accordion Q&A🎯 Rapid Quiz🧠 Practice Quiz🌐 More:www.PassTheMSRA.comwww.FreeMSRA.com🏁 Core TakeawaySudden limb pain + pulselessness = emergency.Think: 6 P’s, AFAT, DR BOLT.Act fast – every second matters.#MSRA #AcuteLimbIschaemia #VascularEmergency #6Ps #AFAT #DRBOLT #PassTheMSRA #FreeMSRA #MSRAQuiz #MSRAFlashcards #MedicalRevision #GPTraining