Effect of left atrial function on cardiovascular outcome in non-dilated left ventricular cardiomyopathy

Abstract

Abstract Background This study aimed to determine whether atrial function and strains can provide the greatest or joint incremental prognostic value in patients with non-dilated left ventricular cardiomyopathy (NDLVC) over a long follow-up period. Methods One hundred sixty-four NDLVC patients were included retrospectively. Comprehensive clinical evaluation and echocardiographic investigations were obtained, including measurements of strain derived left atrial (LA) reservoir, conduit, booster strain. All patients were followed up for adverse cardiac events (MACE) including all-cause mortality, hospitalization due to heart failure aggravation. The predictors of MACE were examined with univariable and multivariable Cox regression analysis. Subsequently, nested Cox regression models were built to evaluate the incremental prognostic value of strain parameters. Patient survival was illustrated by Kaplan–Meier curves and differences were evaluated by log-rank test. Results During a median follow-up of 3.8 years, MACEs were identified in 34 (21%) patients. Cox regression models showed that the predictive value of LA conduit strain was independent from and incremental to LAVi and baseline variables. Age, E/e', RASP and LA reservoir and conduit strain were univariably associated with the outcome (all P < 0.05). LA conduit strain was a stronger predictor of outcome compared with reservoir strain. LA conduit strain, age, RASP remained associated in the multivariable model (LA conduit strain HR: 2.14 [95% CI: 1.37-3.87; P < 0.007]; age HR: 1.05 [95% CI: 1.01-1.10; P = 0.020]; and RASP HR: 1.07 [95% CI: 1.01-1.14; P = 0.021]), whereas LVEF, LAVi were not. Adding LA conduit strain to other independent predictors (age and LAVi) improved the prediction of MACEs. (p < 0.05). Also, when a Kaplan Meier graph was obtained for the occurrence of MACE based on LA conduit strain 17%, a significant difference was shown between the two groups. Conclusion LA conduit strain provided the good prognostic value and added incremental value to conventional clinical predictors for patients with NDLVC.Incremental value of LA strainKM according to LA strain 17%