Outcomes of Adults With Unrepaired Partial Anomalous Pulmonary Venous Return and Intact Atrial Septum.

Background: The purpose of this study was to describe the correlates and outcomes in adults with unrepaired partial anomalous pulmonary venous return and intact atrial septum (PAPVR-IAS).
Methods and Results: We identified adults with PAPVR-IAS who received care at the Mayo Clinic, while those with unrepaired PAPVR-IAS comprised the reference group. Clinical indices (New York Heart Association class, peak oxygen consumption, and NT-proBNP [N-terminal pro-B-type natriuretic peptide]) and echo-derived right heart indices (right atrial [RA] volume, RA reservoir strain, right ventricular [RV] free wall strain, RV end-diastolic area, and RV systolic pressure) were assessed at baseline and 3-year and 5-year follow-up. There were 80 patients and 38 patients with unrepaired versus repaired PAPVR-IAS, respectively. The clinical predictors of surgical repair were the number of anomalous veins, RA volume, and RV end-diastolic area. The PAPVR-IAS risk score, derived from these clinical predictors, was associated with surgical repair (adjusted odds ratio, 1.37 [95% CI, 1.24-1.65] per unit increase in risk score; area under the curve, 0.742). Among patients with unrepaired PAPVR-IAS with 3-year (n=73) and 5-year follow-up (n=36), there was no temporal change in clinical indices (New York Heart Association class, predicted peak oxygen consumption, and NT-proBNP) and right heart indices (RA volume index, RA reservoir strain, RV end-diastolic area index, RV free wall strain, and RV systolic pressure).
Conclusions: The PAPVR-IAS risk score can be used to assess the odds of requiring surgical repair. Furthermore, there was no temporal deterioration in clinical and right heart indices during follow-up in adults with unrepaired PAPVR-IAS.