Anatomical Left Superior Vena Cava Correction: An Option for Left Ventricular Recruitment?

Area of Science:

• Cardiology
• Pediatric Cardiac Surgery
• Congenital Heart Disease

Background:

• Left superior vena cava (LSVC) anomalies can obstruct mitral inflow, particularly in complex congenital heart defects like hypoplastic left heart complex.
• Dilated coronary sinus associated with LSVC can impede left ventricular filling.

Purpose of the Study:

• To evaluate the impact of establishing LSVC to right superior vena cava (RSVC) continuity on the growth of borderline hypoplastic left ventricular structures.
• To assess the effect of LSVC correction on left ventricular filling, aortic valve, and left ventricular outflow tract (LVOT) dimensions.

Main Methods:

• Retrospective review of clinical data for 28 patients with LSVC-related mitral inflow obstruction undergoing congenital heart defect correction.
• Surgical interventions included LSVC to RSVC anastomosis (n=22) or LSVC ligation/clip closure (n=6).
• Echocardiographic measurements of left ventricular end-diastolic diameters (LVEDD), aortic valve, and LVOT diameters were analyzed pre- and postoperatively.

Main Results:

• 90% survival rate at 3.3 years post-intervention.
• Significant improvement in mean LVEDD Z-scores from -2.19 to -1.24 after repair (p<0.01).
• Postoperative increases observed in LVOT Z-scores (from -2.49 to -0.87) and aortic valve Z-scores (from -1.08 to 0.5).

Conclusions:

• Anatomical correction of LSVC obstruction can enhance left ventricular filling and promote growth in borderline left ventricles.
• LSVC to RSVC continuity may serve as a valuable recruitment strategy in managing complex pediatric cardiac anomalies.
• Surgical intervention is associated with improved cardiac structure dimensions and favorable long-term survival.