---

Bronchial Artery Embolization (BAE)

A Complete MD Examination Answer (15 Marks)

---

1. Introduction

"Bronchial artery embolization is considered a first-line definitive procedure for managing hemoptysis. Bronchial artery embolization may control brisk bleeding in 75–90% of patients, permitting the definitive surgical procedure to be done more safely if it is appropriate." — Harrison's Principles of Internal Medicine 22E (2025)

---

2. Anatomy of the Bronchial Arteries

---

3. Indications for BAE

• Massive hemoptysis: classically defined as >200–600 mL/24 hours (or any amount threatening life)
• Moderate hemoptysis (100–300 mL/24 hr) not responding to conservative management
• Recurrent hemoptysis preventing normal activity despite conservative measures
• First-line treatment before elective/semi-elective surgery

• Pulmonary tuberculosis (most common cause in developing countries)
• Bronchiectasis (including cystic fibrosis)
• Aspergilloma / invasive fungal infections
• Lung abscess
• Lung carcinoma (central tumors)
• Pulmonary arteriovenous malformations
• Rasmussen's aneurysm (mycotic pulmonary artery aneurysm in TB cavities)
• Dieulafoy disease (tortuous dysplastic submucosal artery)

• Allergy to contrast (relative — can premedicate)
• Severe coagulopathy (relative — correct first)
• Spinal artery arising from the target bronchial artery (requires superselective catheterization)
• Hemoptysis from pulmonary artery source (requires different approach)

---

4. Pre-Procedure Evaluation

• Airway stabilization is the absolute first priority
• Hemodynamic resuscitation (large-bore IV, blood products)
• Patient positioning: lateral decubitus with bleeding side down to protect contralateral lung

1. Chest X-ray: First test; localizes lesion but blood soiling may obscure pathology
2. Multidetector CT Angiography (MDCT-A): Preferred pre-procedure imaging
   • Identifies source of bleeding with high sensitivity
   • Delineates normal and abnormal bronchial/non-bronchial systemic arteries
   • Maps ectopic origins and determines laterality
   • Identifies Rasmussen's aneurysm, pseudoaneurysms, AV malformations
3. Flexible Bronchoscopy: Used to localize bleeding to a specific lobe/segment, guides the angiographer; must be performed with excellent suction prepared

---

5. Step-by-Step Procedure Technique

Step 1: Vascular Access

• Right common femoral artery is preferred access (5/6 Fr sheath over Seldinger technique)
• Brachial or radial access for ectopic bronchial arteries from subclavian branches (higher morbidity)
• Systemic heparin administered intra-arterially (2000–3000 units, weight-based)

Step 2: Aortography

• A 5 Fr catheter (Cobra, Simmons, or Judkins Right) is advanced to the descending thoracic aorta
• Preliminary aortogram at T5–T6 level to identify bronchial artery origins and ectopic vessels
• Identify all bronchial and non-bronchial systemic collateral arteries (internal mammary, intercostal, inferior phrenic)

Step 3: Selective Catheterization

• Selective catheterization of each bronchial artery
• Digital Subtraction Angiography (DSA) performed to identify:
  • Hypertrophy and tortuosity of arteries
  • Hypervascularity and neovascularity
  • Contrast extravasation (active bleeding — pathognomonic but seen in only 5–10%)
  • Bronchopulmonary shunting
  • Spinal artery branches (anterior spinal artery — must be excluded before embolization)

Step 4: Superselective Catheterization

• A 3 Fr coaxial microcatheter (e.g., Progreat) advanced beyond the origin of the spinal artery to reduce risk of spinal cord ischemia
• Critical safety step when the anterior spinal artery is identified sharing a trunk with the target vessel

Step 5: Embolization

• Embolic material injected slowly under fluoroscopic guidance until radiographic stasis (cessation of flow) is achieved
• Bilateral embolization performed if bleeding is bilateral or site not localized
• If bleeding persists after BAE, pulmonary angiography performed at the same setting to exclude pulmonary artery source

---

6. Embolic Agents

Important: Gelfoam as sole agent is associated with high recanalization and recurrence. Coils alone are discouraged proximally as they prevent re-access for re-embolization.

---

7. Angiographic Features of Abnormal Bronchial Arteries

• Hypertrophied, tortuous bronchial arteries (diameter >2 mm)
• Dense parenchymal blush/hypervascularity
• Neovascularity
• Bronchopulmonary vascular shunting
• Pulmonary artery filling via shunts
• Active contrast extravasation (seen in ~5–10% — direct evidence of bleeding)
• Aneurysm or pseudoaneurysm formation

---

8. Outcomes and Efficacy

1. Incomplete initial embolization (missed vessels)
2. Recanalization of embolized arteries
3. Recruitment of new collateral vessels
4. Progression of underlying disease
5. Non-bronchial systemic collateral arteries not embolized

• Aspergilloma (most prone)
• Non-bronchial systemic collaterals
• Bronchopulmonary shunting
• Cystic fibrosis
• Active TB reactivation / multidrug-resistant TB

"Recurrence after bronchial artery embolization is less common in the setting of malignancy and active tuberculosis but does occur and can ultimately result in patient death." — Schwartz's Principles of Surgery

---

9. Complications

Minor Complications (Transient, Self-limiting)

Major Complications (Serious, Rare)

---

10. Role in Management Algorithm

Massive Hemoptysis
       ↓
Airway control (ETT, bronchial blocker, double-lumen tube)
       ↓
Hemodynamic resuscitation
       ↓
MDCT Angiography (if stable) → Localize source
       ↓
BAE (First-line definitive treatment)
       ↓
    ┌──────────────────┬──────────────────┐
Success               Failure            Recurrence
(70–99%)          (pulmonary artery   → Repeat BAE
                    source → PA        → Consider surgery
                    angiography +
                    embolization)
                  → Surgery (salvage)

• Failure of embolization
• Aspergilloma (resection)
• Iatrogenic pulmonary artery injury
• Thoracic trauma
• Tracheoinnominate artery fistula

---

11. Special Situations

---

12. Post-Procedure Care

• Vital signs monitoring every 30 minutes
• Assess groin access site for hematoma; check dorsalis pedis pulse and lower limb power
• Bed rest for 4–6 hours
• Analgesia as needed
• Hemoptysis assessment at 24 hours, 2–3 weeks, 3 months, and 6 months post-BAE

---

13. Summary Table

---

Recent Evidence (2024–2025)

---