PAPVR (RUPV-SVC) #2 Double Patch Technique

PAPVR with right upper pulmonary vein (RUPV) drainage to the SVC/upper RA is frequently associated with a superior sinus venosus ASD (SV-ASD). The surgical problem is not simply “closing an ASD,” but reconstructing two intersecting conduits at the SVC–RA junction:

1. Pulmonary venous pathway (RUPV → LA)
2. Systemic venous pathway (SVC → RA)

The double-patch technique addresses both by combining:

• Patch #1: an intracardiac baffle that routes anomalous PV flow to the LA via the SV-ASD, and
• Patch #2: SVC/cavo-atrial augmentation to prevent iatrogenic SVC narrowing.

1) Surgical objective (what “success” means)

A durable repair achieves three endpoint domains:

A. Pulmonary venous pathway (RUPV → LA)

• Wide, nonrestrictive baffle channel with low Doppler gradients and no pulmonary venous/baffle stenosis.
• Avoids “tubularization” of the PV orifice by tight baffle geometry.

B. Systemic venous pathway (SVC → RA)

• No cavo-atrial/SVC stenosis (no upper-body venous hypertension, no collateralization).
• SVC patency is a dominant determinant of reintervention risk across techniques. [1,3,7]

C. Rhythm preservation (sinus node integrity)

• Avoids injury to the SA node/SA nodal artery, and avoids excessive traction/suture burden near the superior cavo-atrial junction.
• Postoperative rhythm outcomes differ meaningfully by technique and by age. [1,2,5–7]

Clinical failure modes to prevent:

(i) SVC obstruction, (ii) pulmonary venous/baffle obstruction, and (iii) sinus node dysfunction/atrial arrhythmias. [1–3,5–7]

2) Why “double patch” (the logic)

Problem with single-patch / baffle-only approaches

A single patch that both closes the defect and redirects PV flow can create a tight “shared space” geometry at the SVC–RA junction, predisposing to:

• SVC narrowing, especially when the anomalous PV enters high near the SVC/RA junction, and/or
• Crowding of the pulmonary venous pathway (baffle/PV obstruction). [3,8]

What the second patch adds

The second patch enlarges the cavo-atrial junction/anterior SVC, effectively “buying space” to:

• reduce SVC stenosis risk, and
• reduce tension/distortion near the sinus node region. [3,8]

Comparative experiences show that a generous two-patch strategy can be technically reproducible with low venous obstruction when geometry is respected, but rhythm trade-offs must be anticipated. [1–3,5,8]

3) Operative sequence (double-patch technique)

Step 1 — Define the crossroads anatomy (mandatory precondition)

• Confirm RUPV(s) draining to upper RA/SVC and define the PV orifice relative to the SV-ASD and SVC entrance.
• Note: “How high” the PV inserts into the SVC is a key driver of whether a Warden-type strategy becomes preferable. [1,3,7]

Step 2 — Exposure: RA + anterior SVC incision, protecting sinus node territory

• Choose an incision that provides direct visualization of:
• the SV-ASD,
• the anomalous PV orifice, and
• the planned baffle landing zone.
• The incision should be planned with the assumption that the SA nodal artery course is variable, and that superior cavo-atrial manipulation increases rhythm risk—particularly in children. [6]

Step 3 — Patch #1 (intracardiac baffle): route RUPV → LA via SV-ASD

Construct a baffle that channels anomalous pulmonary venous return to the LA. The baffle must be:

• Non-restrictive: generous width; avoid “vein-sized” tunnels.
• Smooth/laminar: avoid sharp angulation (turbulence → gradients → late obstruction risk).
• Stable: anchored to reliable atrial tissue to prevent distortion.

Technical pearls

• Avoid “hugging” the PV orifice with tight bites.
• Think “atrium-sized curve,” not “shortest-distance tube.”

Step 4 — Patch #2 (SVC/cavo-atrial augmentation): preserve systemic venous caliber

• Augment the anterior SVC/cavo-atrial junction to prevent iatrogenic narrowing created by the baffle and closure geometry.
• This is the key maneuver to maintain low SVC gradients and reduce the need for later reintervention. [3,7,8]

4) Technique selection: Double-patch vs Warden (decision-making framework)

Both strategies can produce excellent anatomic repair; the selection is anatomy-driven and outcome-informed.

When double-patch is typically attractive

• Moderate/high concern for cavo-atrial narrowing with a baffle-only approach, where augmentation can safely create a wide SVC channel.
• Need to prioritize systemic venous caliber while maintaining a simple intracardiac route. [3,8]

When Warden-type strategies are often preferred

• Very high PV insertion into the SVC, or anatomy in which intracardiac baffling would compromise the SVC or place extensive suture lines at the superior cavo-atrial junction. [1,7]
• Many cohorts report better postoperative sinus rhythm prevalence with strategies that reduce superior cavo-atrial manipulation compared with historical two-patch cohorts. [1,2,5,6]

Outcome trade-offs to communicate in planning

• Rhythm: Two-patch repair has been associated with higher sinus node dysfunction/ectopic atrial rhythms in several experiences, whereas Warden-based approaches often demonstrate more favorable sinus rhythm profiles. [1,2,5,6]
• Obstruction/reintervention: Any technique can fail by stenosis at a reconstructed venous pathway; younger age increases reintervention risk irrespective of technique in supracardiac PAPVR cohorts. [7]

5) Complications and surveillance

Early

• SVC obstruction: facial/upper-extremity edema, elevated SVC gradients, collateralization; consider early echo/TEE-driven assessment. [1–3,7]
• Rhythm disturbances: junctional rhythm, ectopic atrial rhythm, bradycardia; risk is amplified in pediatric patients, plausibly due to proximity of the sinus node to the superior cavo-atrial incision zone. [6]

Late

• Systemic venous pathway stenosis: echo ± cross-sectional imaging if symptoms/gradients appear. [3,7]
• Pulmonary venous/baffle stenosis: Doppler gradients, PV flow patterns, right heart remodeling; intervene early if obstruction is progressive. [3,8]

6) Practical “upgrade” concepts (high-yield refinement)

• Geometry-first planning: decide the pathway shapes before placing sutures—your “final lumen” must be visualized at the start. [3,8]
• Generous augmentation is not optional: the second patch should be sized to prevent any sense of tension or narrowing at the cavo-atrial junction. [3,7,8]
• Age matters: rhythm vulnerability is higher in children regardless of patch strategy; minimize superior cavo-atrial manipulation whenever anatomy allows. [6,7]

References

[1] Stewart RD, Bailliard F, Kelle AM, Backer CL, Young L, Mavroudis C. Evolving surgical strategy for sinus venosus atrial septal defect: effect on sinus node function and late venous obstruction. Ann Thorac Surg. 2007;84(5):1651-1655.

[2] Soják V, Šimek P, Škovránek J, et al. Outcomes after surgical repair of sinus venosus atrial septal defect in children. Eur J Cardiothorac Surg. 2008;34(4):855-860.

[3] Said SM, Burkhart HM, Schaff HV, et al. Single-patch, 2-patch, and caval division techniques for repair of partial anomalous pulmonary venous connections: does it matter? J Thorac Cardiovasc Surg. 2012;143(4):896-903.

[4] Elzein C, Abdulkarim M, Abbas U, Vricella L, Ilbawi M. Repair of Superior Sinus Venosus Atrial Septal Defect Using a Modified Two-Patch Technique. Ann Thorac Surg. 2020;111(3):980-986.

[5] Stephens EH, Mongé MC, Eltayeb O, et al. Evolution and current results of a unified strategy for sinus venosus surgery. Ann Thorac Surg. 2021;111(3):980-986.

[6] Ait-Ali L, Marino D, De Lucia V, et al. The different surgical impact of the superior cavoatrial incision in children and adults. Cardiol Young. 2021;31(3):455-461.

[7] Binsalamah ZM, Said SM, Burkhart HM, et al. Younger Age at Operation Is Associated With Increased Risk for Reintervention After Repair of Supracardiac Partial Anomalous Pulmonary Venous Connection. Ann Thorac Surg. 2021;112(1):236-243.

[8] Iyer AP, Soman R, Parelkar S, et al. Comparative study of single- and double-patch techniques for sinus venosus atrial septal defect with partial anomalous pulmonary venous connection. J Thorac Cardiovasc Surg. 2007;133(3):656-659.