Which is the most common site of femoral artery puncture in the femoral triangle for vascular access?

Explanation

## Femoral Artery Puncture Site in the Femoral Triangle ### Anatomical Landmarks **Key Point:** The femoral artery lies within the femoral triangle, bounded by the inguinal ligament superiorly, medial border of adductor longus medially, and lateral border of sartorius laterally. ### Most Common Puncture Site **High-Yield:** The femoral artery is most reliably accessed **lateral to the femoral vein, at the level of the inguinal ligament**. This is the standard approach for: - Cardiac catheterization - Angiography - Femoral artery cannulation - Interventional procedures ### Why This Site? 1. **Superficial location** — The artery lies superficial at this point, making palpation easy 2. **Lateral to vein** — Reduces risk of venous puncture and arteriovenous fistula formation 3. **Inguinal ligament level** — Provides bony landmark for precise localization 4. **Avoids complications** — Puncture below the inguinal ligament risks retroperitoneal hemorrhage; above risks intra-abdominal bleeding ### Clinical Pearl **Mnemonic — NAVEL (from lateral to medial):** Nerve, Artery, Vein, Empty space, Lymphatics. The femoral artery is the second structure encountered when probing from lateral to medial in the femoral triangle. ### Anatomical Relationships | Structure | Position in Triangle | Clinical Significance | | --- | --- | --- | | Femoral nerve | Lateral | Avoid — causes femoral nerve palsy | | Femoral artery | Middle | Target for vascular access | | Femoral vein | Medial | Avoid — risk of thrombosis, fistula | | Inguinal ligament | Superior | Landmark for puncture site | [cite:Standring Anatomy 42e Ch 77]