ALCAPA #2 — Operative Technique: Direct LCA Reimplantation

Direct reimplantation of the left coronary artery (LCA) into the aorta is currently regarded as the preferred surgical strategy for most patients with anomalous left coronary artery from the pulmonary artery (ALCAPA). The fundamental objective is the anatomic and physiologic restoration of a two-coronary system, thereby re-establishing durable myocardial perfusion under systemic pressure and eliminating coronary steal into the pulmonary circulation [1–3].

Long-term series consistently demonstrate excellent survival and progressive recovery of left ventricular (LV) function following successful reimplantation, supporting this approach as the contemporary standard when anatomy permits [1,4].

1. Surgical Principle

The operation corrects the classic “wrong-source” coronary physiology through three essential steps:

Disconnection of the LCA from the pulmonary artery (PA), eliminating low-pressure coronary runoff
Reimplantation of the LCA into the aorta in a tension-free, non-kinked, and non-torsional configuration
Reconstruction of the PA, restoring unobstructed pulmonary outflow and growth potential

This strategy most closely reproduces normal coronary anatomy and physiology and avoids the long-term complications associated with intrapulmonary tunnel techniques [2,5].

2. Operative Steps (Conceptual Framework)

Step 1. Coronary Button Excision and Mobilization

The LCA is excised from the main pulmonary artery with a generous coronary button, ensuring:

Adequate tissue for a secure, non-stenotic anastomosis
Preservation of the native ostial geometry

The proximal LCA is then carefully mobilized toward the aorta, with specific attention to:

Avoiding traction or intimal injury
Preserving adventitial integrity
Maintaining a natural, untwisted course

Key concept: Length is safety. Adequate mobilization is critical to achieving a tension-free reimplantation and minimizing the risk of late kinking or torsion [3].

Step 2. Aortic Implantation

A strategically positioned aortic incision is created, typically on the left-posterior or lateral aspect of the ascending aorta, selected to:

Match the native spatial orientation of the LCA
Avoid acute angulation or stretch after reimplantation

The coronary button is anastomosed to the aorta using fine, interrupted or continuous sutures, tailored to vessel size and tissue quality.

Technical objective:

A tension-free, non-kinked, non-twisted coronary transfer that permits unrestricted antegrade coronary flow under systemic pressure.

Step 3. Pulmonary Artery Reconstruction

The PA defect resulting from coronary excision is:

Enlarged as necessary to prevent supravalvar pulmonary stenosis
Reconstructed most commonly using an autologous pericardial patch

Patch geometry should respect the native curvature of the PA and accommodate future somatic growth.

3. Technical Pearls and Pitfalls

Technical Pearls

A generous coronary button reduces the risk of anastomotic narrowing
The final lie of the LCA should be assessed before committing sutures
Optimal implantation site selection is more important than geometric symmetry

Common Pitfalls

Inadequate mobilization → late kinking or torsion
High or anterior aortic implantation → unfavorable coronary angulation
Under-sized PA patch → supravalvar PA stenosis requiring reintervention

4. Adjunctive Considerations

Mitral Regurgitation

Mitral regurgitation (MR) is common preoperatively, primarily due to papillary muscle ischemia
In most patients, MR improves spontaneously after coronary revascularization alone, paralleling LV functional recovery [4,6]
Routine mitral valve repair at the initial operation is not universally indicated and is generally reserved for:

Severe MR
Structural leaflet or chordal abnormalities

Ventricular Dysfunction

Significant LV dysfunction is frequently present at diagnosis
Postoperative myocardial recovery is often gradual, particularly in infants, and may require:

Inotropic support
Afterload reduction
Temporary mechanical circulatory support in selected cases

Despite severe preoperative dysfunction, multiple series demonstrate substantial improvement in LV ejection fraction following reimplantation, often normalizing over time [1,4,7].

5. Outcomes and Contemporary Perspective

Long-term outcomes following direct LCA reimplantation are excellent:

Survival exceeding 95% at 15–20 years in large series [1,3]
Consistent recovery of LV systolic function
Acceptable freedom from coronary or PA reintervention

Compared with intrapulmonary tunnel (Takeuchi) repair:

Reimplantation avoids late PA stenosis and baffle-related complications
Coronary anatomy and flow patterns are more physiologic
Overall reintervention rates appear similar, though failure modes differ [2,5,7]

Current evidence suggests that patient age is less predictive of outcome than timely surgical correction, emphasizing early diagnosis and prompt repair whenever feasible [1,3].

References

[1] Naimo PS, Fricke TA, d’Udekem Y, et al. Surgical intervention for anomalous origin of the left coronary artery from the pulmonary artery in children: A long-term follow-up. J Thorac Cardiovasc Surg. 2016;152(3):791–799.

[2] Lange R, Vogt M, Hörer J, et al. Long-term results of repair of anomalous origin of the left coronary artery from the pulmonary artery. Ann Thorac Surg. 2018;106(5):1486–1493.

[3] Ling Y, Xu M, Li X, et al. Surgical repair of anomalous left coronary artery from the pulmonary artery: Early and mid-term outcomes. Eur J Cardiothorac Surg. 2016;50(5):831–836.

[4] Cabrera AG, Chen DW, Pignatelli RH, et al. Outcomes of anomalous left coronary artery from pulmonary artery repair: Beyond infancy. Ann Thorac Surg. 2015;100(2):582–589.

[5] Yuan X, Chen X, Wang Y, et al. Long-term outcomes of Takeuchi versus direct reimplantation repair for ALCAPA. Interact Cardiovasc Thorac Surg. 2018;27(5):727–733.

[6] Kudumula V, Mehta C, Stumper O, et al. Mid-term outcomes of mitral regurgitation after repair of anomalous left coronary artery from the pulmonary artery. J Thorac Cardiovasc Surg. 2014;148(6):2787–2792.

[7] Brown JW, Ruzmetov M, Huynh D, et al. Late results of surgical repair of anomalous origin of the left coronary artery from the pulmonary artery. Ann Thorac Surg. 2009;87(2):544–549.