Association between the TAPSE to PASP ratio and short-term outcome in patients with light-chain cardiac amyloidosis

BACKGROUND: Amyloid light-chain cardiac amyloidosis (AL-CA) patients experiencing RV failure have a poorer prognosis. The echocardiographic ratio of tricuspid annular plane systolic excursion (TAPSE) to pulmonary arterial systolic pressure (PASP) serves as a non-invasive proxy for evaluating the coupling between the right ventricle (RV) and pulmonary circulation. The aim of this study was to assess the association between the TAPSE/PASP ratio and short-term outcome in patients with AL-CA. METHODS: Seventy-one patients diagnosed with AL-CA were enrolled in this retrospective cohort study.Short-term outcome was defined as 6-month all-cause mortality. Receiver operating characteristic (ROC), logistic regression, and Kaplan-Meier analysis were used in this study. RESULTS: Among seventy-one patients with AL-CA (mean age, 62 ± 8 years, 69% male), 17 (24%) died within the first 6 months (mean follow-up period 55 ± 48 days). Linear regression analysis indicated that the TAPSE/PASP ratio was correlated with RV global longitudinal strain (r = -0.655, p < 0.001), RV free wall thickness (r = -0.599, p < 0.001), and left atrial reservoir strain (r = 0.770, p < 0.001). The time-dependent ROC and the area under the curve (AUC) showed that the TAPSE/PASP ratio was a better predictor (AUC = 0.798; 95% confidence interval (CI): 0.677-0.929) of short-term outcome than TAPSE (AUC = 0.734; 95% CI: 0.585-0.882) and PASP (AUC: 0.730; 95% CI: 0.587-0.874). Multivariate logistic regression showed that patients with the worse TAPSE/PASP (< 0.47 mm/mmHg) and lower systolic blood pressure (< 100 mmHg) had the highest risk of dying. CONCLUSIONS: The TAPSE/PASP ratio is associated with the short-term outcome of patients with AL-CA. The combination of TAPSE/PASP ratio < 0.474 mmHg and SBP < 100 mmHg could identify the subgroup of patients with AL-CA at elevated risk of poor prognosis.