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Cardiac function in total anomalous pulmonary venous return before and after surgery
Insights
This study examined cardiac function in infants with total anomalous pulmonary venous return (TAPVR). Findings show impaired left ventricular function and abnormal left atrial function, which normalize after surgical repair.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease
Background:
- Total anomalous pulmonary venous return (TAPVR) is a complex congenital heart defect.
- Understanding its impact on cardiac performance is crucial for surgical planning.
Purpose of the Study:
- To evaluate cardiac performance in infants with isolated TAPVR.
- To assess the role of pulmonary venous obstruction and left atrial size in TAPVR.
Main Methods:
- Echocardiographic assessment of ventricular volumes and ejection fractions.
- Comparison of cardiac parameters between infants with and without pulmonary venous obstruction.
Main Results:
- Infants with TAPVR exhibited increased right ventricular end-diastolic volume and reduced left ventricular ejection fraction.
- Abnormal left atrial function, with reduced reservoir capacity, was observed.
- Pulmonary venous obstruction correlated with smaller chamber volumes.
Conclusions:
- TAPVR significantly affects biventricular function and left atrial mechanics.
- Left atrial size is not a critical factor for surgical repair outcomes.
- Surgical correction of TAPVR effectively restores normal cardiac function.
Abstract:
Cardiac performance was evaluated in 12 infants with isolated total anomalous pulmonary venous return. Four had significant pulmonary venous obstruction and severe pulmonary hypertension (group A). Eight had no obvious venous obstruction, and the pulmonary pressures were lower (group B). In all subjects, right ventricular end-diastolic volume was increased (197% of predicted normal) and its ejection fraction was normal. Left ventricular volume was, generally speaking, still in the normal range (87% of predicted normal); however, its ejection fraction was reduced (0.57 vs normal of 0.73) and left ventricular output was low (3.08 L/min/m2 vs normal of 3.98). Left atrial volume was consistently small (53% of predicted normal) with an appendage of normal size. The infants in group A had smaller chamber volumes/m2 BSA than those in group B. Left atrial function was abnormal, characterized by reduced reservoir function and a greater role as "conduit" from right atrium to left ventricle. Left atrial size was not found to be critical in the surgical repair of TAPVR. Cardiac function is restored to normal following surgery.