Invasive haemodynamics and advanced echocardiography to define the diagnostic and prognostic value of left atrial function in advanced heart failure
V Nuzzi, P Manca, C Madaudo, L Fazzini, S Cannata, F Fortuni, L Pagano, G M Raffa, M Mule', M G Cipriani, R LorussoAbstract
Background
Advanced heart failure (AdHF) presents challenges for haemodynamic assessment and carries a poor prognosis. Left atrial (LA) function by strain imaging is a promising non-invasive marker, but its relationship with invasive haemodynamics and its prognostic role in AdHF is poorly understood.
Methods
Consecutive patients referred for AdHF were prospectively enrolled. Patients underwent advanced transthoracic echocardiography and right heart catheterisation (RHC). The diagnostic outcome was elevated pulmonary artery wedge pressure (PAWP) (>15 mmHg) at RHC. The prognostic outcome was a composite of death/heart transplant/left ventricular assist device/heart failure hospitalisation.
Results
A total of 155 patients were included. Median age was 55 years (IQR 48-61), median peak left atrial strain (PALS) was 11% (7-17), and mean PAWP was 14 mmHg (8-20). Patients with lower PALS showed features of more severe disease. PALS correlated significantly and linearly with PAWP (r=-0.53, p<0.001) and with all other invasive haemodynamic parameters. PALS showed the best performance for identifying increased PAWP (AUC 0.78, p<0.001), outperforming guideline-based assessment, LA volume, and E/E’. Spline analysis demonstrated a non-linear association between PALS and the prognostic outcome, with steeper risk increases at lower PALS values, confirmed after multivariable adjustment (p=0.014). Adding PALS to models including clinical variables, echocardiography, and invasive haemodynamics further improved prognostic accuracy for 1-year risk of events (Harrel C-index 0.840).
Conclusions
In AdHF, PALS is a robust marker closely related to invasively measured PAWP and identifies patients who require urgent advanced therapies. Routine incorporation of LA strain into the evaluation of AdHF may substantially improve prognostic stratification.