Perfusion Fixation for Rodent Brain Preservation

🩺 Allen Test | Clinical Pearl 1️⃣ Patient makes a tight fist ✊ 2️⃣ Compress both radial ulnar arteries 🫀 3️⃣ Patient opens hand ✋ (palm appears pale) 4️⃣ Release ONE artery 🔓 • Release ulnar → tests ulnar artery patency • Release radial → tests radial artery patency 5️⃣ Hand should return to pink within 5–10 seconds 👀 ✅ Normal = adequate collateral blood flow 🚨 Delayed or absent color return = poor perfusion of that artery Why it matters: Confirms adequate collateral circulation before radi