💉External Ventricular Drain (EVD)

💉 External Ventricular Drain (EVD) – Key Points

Definition:
A temporary catheter placed into the lateral ventricle to drain cerebrospinal fluid (CSF) 💧 or monitor intracranial pressure (ICP 📊).

🔹 Placement Site & Technique 🏥

1️⃣ Typical Entry:

• Through a burr hole in the frontal region 🧠
• Most common anatomical point: Kocher’s Point 📍

2️⃣ Kocher’s Point Location:

• ~2–3 cm lateral to midline ↔
• ~11 cm posterior to nasion 🦴
• Anterior to coronal suture

3️⃣ Why Frontal Placement?

• Direct access to frontal horn of lateral ventricle 🧠
• Minimizes risk to eloquent cortex ⚡
• Easier to secure and maintain 🔧

🔹 Summary of Procedure ✨

1. Burr hole 🛠️ created at Kocher’s point
2. Catheter advancement ➡️ into lateral ventricle
3. Used for:
   • CSF drainage 💧
   • ICP monitoring 📊

💡 Clinical Pearls

• Usually done at bedside or OR 🏥
• Requires neurosurgeon or trained neurocritical care team 👨‍⚕️👩‍⚕️
• Correct placement confirmed by CT scan 🖥️ or ventricular CSF flow