Determinants and prognostic implications of left atrial reverse remodelling after coarctation of aorta repair in adults

Aims Left atrial (LA) dysfunction and atrial fibrillation are also relatively common in adults with coarctation of aorta (COA), and the severity of LA dysfunction is associated with a higher risk of atrial fibrillation in this population. The purpose of this study was to determine whether LA function improved after COA repair (LA reverse remodelling), and the relationship between LA reverse remodelling and atrial fibrillation.Methods and results Retrospective cohort study of adults undergoing COA repair (2003-20). LA reservoir strain was assessed pre intervention and 12-24 months post intervention, using speckle tracking echocardiography. Incident atrial fibrillation was assessed from COA repair to last follow-up. Of 261 adults who underwent COA repair [age 37 & PLUSMN; 13 years; males 148 (57%)], 124 (47%) and 137 (53%) presented with native vs. recurrent COA, respectively. Of 261 patients, 231 (82%) and 48 (18%) underwent surgical and transcatheter COA repair, respectively. The LA reservoir strain increased from 32 & PLUSMN; 8% (pre intervention) to 39 & PLUSMN; 7% (post intervention), yielding a relative increase of 21 & PLUSMN; 5%. Older age [& beta; & PLUSMN; standard error (SE) -0.16 & PLUSMN; 0.09 per 5 years, P = 0.02], higher systolic blood pressure (& beta; & PLUSMN; SE -0.12 & PLUSMN; 0.04 per 5 mmHg, P = 0.005), and higher residual COA mean gradient (& beta; & PLUSMN; SE -0.17 & PLUSMN; 0.06 per 5 mmHg, P = 0.002) post intervention were associated with less LA reverse remodelling, after adjustment for sex, hypertension diagnosis, and left ventricular indices. LA reverse remodelling (hazard ratio 0.97, 95% confidence interval 0.96-0.98 per 1% increase from pre-intervention LA function, P = 0.006) was associated with a lower risk of atrial fibrillation after adjustment for age, sex, pre-intervention LA reservoir strain, and history of atrial fibrillation.Conclusion COA repair resulted in improved LA function and decreased risk for atrial fibrillation, especially in patients without residual hypertension or significant residual COA gradient.