Surgical treatment of aortic coarctation

Preparation and surgical approach

Surgical intervention requires careful selection of the approach and is performed under general anesthesia—specifically, endotracheal anesthesia.

As a standard surgical approach, surgeons use a left posterolateral thoracotomy. There are, however, age-related anatomical differences:

• In adults, the approach is generally widened by resection of the 4th rib.
• In children, the approach is more sparing, and the rib is usually not resected.

A key feature of thoracotomy for this pathology is the presence of a robust network of collateral circulation. Due to the coarctation, patients develop numerous large arterial collaterals. During the approach, the surgeon must carefully dissect and ligate these vessels to prevent massive hemorrhage.

Step 1: Mobilization of the aorta

The first step after entering the thoracic cavity is retraction of the left lung. This allows the surgeons to widely open the mediastinal pleura. The operating field (boundaries of the approach) extends from the origin of the left subclavian artery and continues inferiorly, encompassing a 5–7 cm segment below the aortic narrowing.

To ensure control over blood flow, vessel loops are passed around the aorta (proximal and distal to the coarctation site). Next, mobilization of the structures is performed:

1. Management of ligaments and the ductus. The surgeon divides the ligamentum arteriosum. If the patient has a patent ductus arteriosus (PDA), it is also divided, and the resulting ends are securely closed with sutures.
2. Vessel dissection. The aortic arch and left subclavian artery are dissected.
3. Ligation of branches. To make the aorta sufficiently mobile, 2–3 pairs of intercostal arteries are ligated. Without this step, adequate vascular mobilization is impossible.

During mediastinal manipulations, it is important to consider nerve syntopy: the vagus nerve (N. vagus) is gently retracted in a medial direction.

Step 2: Classical resection and anastomosis

The classical version of the operation involves complete excision of the pathological segment. After mobilization is complete, vascular clamps are applied to the aortic segments above and below the coarctation zone.

The stenotic segment is resected, after which the integrity of the major vessel is restored by creating an end-to-end vascular anastomosis. The suture placement technique is strictly regulated: the surgeon first forms the posterior lip of the anastomosis and only then proceeds to suture the ventral (anterior) wall of the vessel.

The final step is the restoration of blood flow—the clamps are removed, and vessel patency is restored.

Step 3: Alternative method (graft replacement)

Clinical situations arise where classical resection with a direct anastomosis is unfeasible. The primary indication for an alternative method is extended aortic narrowing.

When a long segment is excised, a significant diastase forms between the ends of the aorta. Under such conditions, approximating the ends for direct suturing is impossible. The solution is allograft replacement—a corrugated vascular graft is sewn into the resulting defect.

Briefly: answers to topical questions

Class and exam questions

What else to study on this topic

• Hemodynamic features in arterial collaterals during aortic coarctation.
• Topographic anatomy of the mediastinum and syntopy of the vagus nerve.
• Technique of vascular suturing in end-to-end anastomoses.
• Surgical tactics in concomitant patent ductus arteriosus.

Other topics in the section "Operations on the Chest Wall and Thoracic Organs"

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