Right ventricular dysfunction parameters at echocardiography in patients with acute pulmonary embolism: meta-analysis of individual participant data

Abstract Background & Aim Echocardiography has a crucial role for decision making on management of patient with acute pulmonary embolism (PE) according to current international guidelines. However, the definition of right ventricle dysfunction (RVD) at echocardiography requires standardization. We performed an Individual patient data meta-analysis (IPDMA) to assess the role of individual parameters of RVD and of combinations of parameters for the prediction of short-term all-cause mortality and PE-related death. Methods A systematic search was run to identify clinical studies reporting on RVD at echocardiography and on short-term clinical outcome in patients with acute PE. Individual patient data from the original studies were pooled to perform a meta-analysis (IPDMA). The study outcomes were short-term death defined as death occurring within 30 days from PE diagnosis and PE-related death. Multiple imputation was used for the management of missing data. The odds ratio for all cause and PE related mortality were calculated using generalized linear mixed effects model. Results Individual data from 9,233 patients with acute PE from 16 studies were pooled in a unique database. All cause short-term mortality occurred in 9% of patients (95% CI 0.06-0.13, I2 93%). The IPDMA was feasible for the following parameters: tricuspid anulus systolic excursion (TAPSE), estimated pulmonary artery pressure (PAP) >30mmHg, right to left ventricle diameter ratio (RV/LV)>1, hypokinesia, paradoxical septal motion, RV diameter>30 mm and McConnel sign. All these parameters, except for PAP>30mmHg and RV diameter>30 mm, were predictors of short-term all cause death in the overall population and in hemodynamically patients (table). All the assessed RV findings, except for the McConnell’s sign, were predictors of PE-related death (Table). The presence of one RVD parameter only was not associated with increased risk of all cause death (OR 1.22, 95% CI 0.97-1-54), while the presence of two parameters or ≥ three parameters were (OR 1.63, 95% CI 1.24-2.15; OR 2.07 95% CI 1.59-2.69, respectively). Conclusion In patients with acute PE, the majority of RVD parameter at echocardiography are predictors of short-term death and of PE-related death. The higher the number of RVD parameters the worst the prognosis. These results claim for standardization in RVD definition to guide decision making for patient management.