Limitations
Our study has the following limitations. First, a limited number of cases included in the study were a main limitation. Thus, multi-centre studies with large cohort of subjects are needed to confirm our study results. The anohter limitation was that there were no patients diagnosed with PoPH. Therefore, it is necessary to examine the predictive value of PAS in cirrhotic patients with PoPH. Finally, the average follow-up time of cirrhotic cases included in the study was relatively short. Because this period was not sufficient to demonstrate some transitions in the pulmonary vascular region, studies involving a longer study cohort are necessary.