Abstract 13811: The Clinical Significance of End-diastolic Forward Flow on the Prognosis After Pulmonary Valve Replacement in Patients Late After Repair of Tetralogy of Fallot

Abstract

Introduction: Restrictive right ventricular physiology (r-RVP) is common in late after repair of tetralogy of Fallot (TOF) and reported to reflect diastolic dysfunction. Right ventricular (RV) diastolic dysfunction sometimes remains after pulmonary valve replacement (PVR) and is associated with arrhythmia. Pulmonary arterial end-diastolic forward flow (EDFF) is considered as a marker of r-RVP, and associated with RV volume, right atrial (RA) function, and the degree of pulmonary valve regurgitation (PR). The aim of this study is to evaluate the impact of EDFF before PVR on the clinical outcomes after PVR in patients with repaired TOF. Methods: This was a single-center, retrospective review of 46 patients who underwent PVR for moderate to severe PR between 2003 and 2019. Cases were examined EDFF before PVR and divided into two groups: with EDFF (EDFF+, n=23) and without EDFF (EDFF-, n=23). Patients with histories of atrial tachyarrhythmia underwent concomitant maze procedure. RV and RA volume were evaluated by magnetic resonance imaging. Post-PVR survival and the development of arrhythmia were assessed. Results: Age at PVR was 38±14 in EDFF+ and 35±10 years old in EDFF- (p=0.41), and the incidence of preoperative arrhythmia was not different (30% and 35%, p=1.0). RVESVI (102±24 and 86±26 ml/m 2 , p=0.048) and RAVI (84±19 and 70±20 ml/m 2 , p=0.025) before PVR, and RVEDVI (116±27 and 100±24 ml/m 2 , p=0.04) and RVESVI (71±23 and 55±16 ml/m 2 , p=0.01) at one year after PVR were greater in EDFF+. One patient in each group died due to non-cardiac disease. 5-year atrial tachyarrhythmia free rate was 62% in EDFF+ and 100% in EDFF- (Log-rank p=0.004). Multivariate Cox regression analysis revealed EDFF before PVR was a risk factor for atrial tachyarrhythmia after PVR (Hazard ratio 17 (95% CI, 2.2-406), p=0.025). Conclusions: EDFF before PVR was a significant risk factor for the development of postoperative atrial tachyarrhythmia. EDFF can complement the current indication for PVR.