Right atrial function early after tetralogy of Fallot repair

Area of Science:

• Cardiology
• Pediatric Cardiac Surgery
• Echocardiography

Background:

• Diastolic dysfunction post-Tetralogy of Fallot (TOF) repair is linked to poor long-term outcomes.
• Right atrial (RA) mechanics as a proxy for right ventricular (RV) diastolic function post-TOF repair is understudied.
• Early post-operative assessment of RA and RV function is crucial for understanding outcomes.

Purpose of the Study:

• To evaluate RA and RV strain early after TOF repair before hospital discharge.
• To identify patient-specific factors influencing post-operative RA and RV strain using machine learning.
• To establish the clinical significance of early post-operative RA and RV strain changes.

Main Methods:

• Retrospective cohort study of 153 patients undergoing TOF surgical repair.
• Analysis of pre- and post-operative echocardiograms to assess RA strain parameters and global longitudinal RV strain.
• Gradient boosted machine (GBM) models employed to identify predictors of post-operative strain.

Main Results:

• Significant worsening observed in all RA parameters (peak strain, systolic/diastolic strain rate, emptying fraction) and RV global longitudinal strain from pre- to post-operation.
• GBM models identified key predictors of post-operative strain, including pulmonary valve/artery Z-scores, birth weight, gestational age, age at surgery, pre-operative RV function and oxygen saturation, outflow tract repair type, cardiopulmonary bypass duration, and post-operative oxygen levels.
• Multiple patient and surgical factors significantly influence early post-operative RA and RV strain.

Conclusions:

• Early post-operative repair of Tetralogy of Fallot leads to significant alterations in both right atrial and ventricular function, evidenced by worsening strain.
• Identified patient and operative factors can inform pre-operative risk stratification for TOF repair.
• Further research is warranted to explore the clinical utility and prognostic implications of RA strain and early post-operative functional changes.