PAPVR (RUPV-SVC) #3 Warden Procedure

1) Clinical problem (what must be corrected)

In the typical right-upper PAPVR phenotype, one or more right pulmonary veins—most commonly the right upper pulmonary vein (RUPV)—drain into the SVC or upper RA rather than the left atrium (LA). This is frequently associated with a superior sinus venosus ASD (SV-ASD), creating a pre-atrial left-to-right shunt in which oxygenated pulmonary venous blood re-enters the right heart. The consequence is RA/RV volume overload, increased pulmonary blood flow, and progressive right-sided remodeling.

Anatomic “decision hook”

When the anomalous pulmonary venous insertion is high in the SVC, conventional intracardiac patch repairs become vulnerable to sinus node/SA nodal artery disturbance and/or caval narrowing. This anatomic subset is the classic “home field” for the Warden approach [8].

2) Operative principle (why the Warden strategy works)

The Warden concept is to physically separate:

• Systemic venous return (SVC blood)

from

• The anomalous pulmonary venous entry site (RUPV→SVC/RA junction)

…and then reconstruct two unobstructed pathways:

1. Pulmonary venous rerouting to the LA
• Create an intra-atrial baffle (SV-ASD patch pathway) that directs RUPV flow → LA.
2. Unobstructed SVC drainage to the RA
• Transect the SVC above/at the anomalous entry and re-establish continuity by connecting the distal SVC → right atrial appendage (RAA), typically with augmentation to prevent stenosis.

Why this matters

This architecture is specifically designed to reduce two major failure modes seen with older strategies:

• Sinus node dysfunction / rhythm conversion from injury at the cavoatrial junction [7,9]
• Caval or pulmonary venous pathway obstruction (SVC stenosis; baffle/PV stenosis) [1–6]

3) Stepwise operative description (structure aligned to your figure)

Step 1 — Define the anatomy

• Confirm: RUPV drains to upper RA/SVC, often “high” on the SVC.

Step 2 — Intracardiac exposure and division planning

• Open the RA and identify the SV-ASD.
• Plan SVC division at the level that cleanly separates systemic venous return from the anomalous PV insertion.

Step 3 — Caval division and pulmonary venous rerouting

• Divide the SVC at/near the RUPV entry level (key Warden step).
• Close the proximal SVC stump (RA-side segment).
• Patch the SV-ASD to create a wide, smooth baffle directing RUPV → LA.

Step 4 — Systemic venous reconstruction (distal SVC → RAA)

• Open and mobilize the RAA; remove trabeculations to create a broad receiving chamber.
• Anastomose the posterior wall of the distal SVC to the RAA.

Step 5 — Augmentation to prevent obstruction

• Patch-augment the anterior aspect of the neo-cavoatrial connection to maximize caliber and reduce gradients.
• Close the RA and discontinue CPB.

4) Technical success criteria (what “good” looks like)

A. Pulmonary venous pathway (RUPV → LA baffle)

• Geometry: short, wide, non-angulated pathway; avoid “pinch points” at the SVC/RA junction.
• Physiology: no significant residual interatrial shunt (unless intentionally left in select scenarios).
• Intraoperative echo: laminar PV inflow; low/absent gradients.

B. Systemic venous pathway (distal SVC → RAA)

• Tension-free anastomosis is non-negotiable. A borderline reach is a setup for late narrowing.
• Default to augmentation when the SVC is short, division is high, or caliber is borderline [1,5,8].
• Acceptable gradient should be minimal on intraoperative assessment; persistent gradients warrant revision now, not later.

5) Outcomes and contemporary evidence (integrated summary)

Across modern series, the Warden procedure demonstrates excellent survival and low permanent rhythm-device burden, with late events dominated by SVC pathway issues rather than pulmonary venous obstruction:

• Survival: commonly reported as high at mid-to-late follow-up (e.g., ~94–99% at 5–10 years in large contemporary cohorts) [1,2].
• Reinterventions: typically low (roughly single-digit to low-teens % at 5–10 years), and frequently managed with catheter-based approaches when SVC obstruction occurs [1,2].
• Rhythm: compared with two-patch approaches, Warden-based strategies show lower rates of sinus rhythm conversion/sinus node dysfunction, consistent with avoidance of the cavoatrial junction injury zone [7,9].
• Pulmonary venous/baffle obstruction: generally rare, but still demands meticulous baffle geometry and follow-up [1,3,5].
• Late SVC obstruction: remains the signature late concern in specific anatomic subsets, often treatable with stenting depending on anatomy and patient size [1–6].

6) Risk stratification (who needs the closest follow-up)

Key risk factors for SVC stenosis/obstruction

1. Small SVC caliber: SVC diameter <10 mm is an independent predictor of late SVC stenosis/obstruction in pediatric cohorts [4].
2. Younger age at repair: associated with higher reintervention risk (likely reflecting smaller vessels and growth-related mismatch) [2].
3. High division + tension: short distal SVC or high transection increases anastomotic tension and susceptibility to narrowing—favor augmentation/modifications rather than accepting a tight anastomosis [1,5,8].

7) Practical pearls (high-yield operative heuristics)

• Think “two lumens, two failure modes”: every step should protect both the baffle (PV→LA) and the neo-SVC (SVC→RAA).
• Baffle design: treat it like a flow conduit—wide + smooth + coaxial—because turbulence and shear invite late narrowing.
• Neo-SVC design: if you feel tension, you already have the answer—augment or modify the reconstruction now [1,5].
• Rhythm preservation: avoid unnecessary manipulation/incisions at the cavoatrial junction when possible; this is one rationale for preferring Warden in high-SVC insertion anatomy [7,9].

8) Follow-up focus (what to screen for)

1. SVC pathway patency
• Symptoms: upper-body venous congestion, facial/upper extremity swelling, venous collaterals.
• Imaging: echo Doppler trends; CT/MRI/cath when gradients or symptoms appear.
2. Pulmonary venous pathway / baffle patency
• Doppler PV flow profiles and gradients; assess segmental pulmonary venous obstruction physiology.
3. Rhythm surveillance
• Early junctional rhythm/sinus bradycardia can occur; persistent dysfunction is uncommon in modern series but should be monitored with ECG/Holter when clinically indicated [1,7,9].

References

[1] Griffeth EM, Dearani JA, Mathew J, Graham G, Connolly HM, King KS, Schaff HV, Stephens EH. Early and Late Outcomes of the Warden and Modified Warden Procedure. Ann Thorac Surg. 2022;114(5):1723-1729.

[2] Binsalamah ZM, Ibarra C, Edmunds EE, Qureshi AM, Adachi I, Caldarone CA, Imamura M, McKenzie ED, Heinle JS, Spigel ZA. Younger Age at Operation Is Associated With Reinterventions After the Warden Procedure. Ann Thorac Surg. 2021;111(6):2059-2065.

[3] Yong MS, Griffiths S, Robertson T, Brink J, d'Udekem Y, Brizard C, Konstantinov IE. Outcomes of the Warden procedure for partial anomalous pulmonary venous drainage in children. Interact Cardiovasc Thorac Surg. 2018;27(3):422-426.

[4] Lin H, Yan J, Wang Q, Li S, Sun H, Zhang Y, Zhang L, Liu W. Outcomes of the Warden Procedure for Partial Anomalous Pulmonary Venous Drainage. Pediatr Cardiol. 2020;41(1):134-140.

[5] Lim SC, Kwak JG, Cho S, Min J, Lee S, Kwon HW, Kim WH. Outcomes of the Warden Procedure for Anomalous Pulmonary Venous Return to the Superior Vena Cava: A 17-Year Experience. J Chest Surg. 2022;55(3):206-213.

[6] Park CS, Kwak JG, Lee C, Lee CH, Lee SY, Choi EY, Song JY, Kim SJ. Partial anomalous pulmonary venous connection to the superior vena cava: the outcome after the Warden procedure. Eur J Cardiothorac Surg. 2012;41(2):261-265.

[7] 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.

[8] Shahriari A, Rodefeld MD, Turrentine MW, Brown JW. Caval division technique for sinus venosus atrial septal defect with partial anomalous pulmonary venous connection. Ann Thorac Surg. 2006;81(1):224-229.

[9] Agarwal V, Okonta KE, Abubakar U, Gichuhi S. Impact of Warden's procedure on the sinus rhythm: our experience. Heart Lung Circ. 2011;20(11):718-721.

[10] Sojak V, Sagat M, Balazova E, Siman J. Outcomes after surgical repair of sinus venosus atrial septal defect in children. Bratisl Lek Listy. 2008;109(5):215-219.