Results: 174 patients were included, 69.9% females, with a mean age of 68 years old (IQR:24). 60% (N=105) had pre-capilary PH, 14% (N=25) isolated pos-capilary PH and 25% (N=44) combined pos-capilary PH. The ratio RA/LA was higher in patients with pre-capillary PH when compared to patients with combined PH and isolated pos-capillary PH (1.42±0.83 vs 1.18±0.92 vs 0.95±0.42, respectively; p=0,019). A ratio RA/LA of 1.31 allowed to differentiate with reasonable diagnostic accuracy (AUC:0.63, specificity:74%, sensibility:50%, NPV:92%, PPV:64%) the pre-capillary phenotype from others.
Conclusion: The ratio RA/LA assessed by TTE is a useful parameter to distinguish between pre-capillary and post-capillary PH.