Study limitations
Since the current study was cross-sectional, no matching was performed
on the subjects; therefore, the heterogeneity in the findings resulted
in the use of non-parametric tests. Thus, small number of subjects in
each study group could be considered as a limitation of the current
study. The overall effect size for one-way ANOVA test ranged from 0.59
to 0.71 and ranged from 0.29 to 0.79 for Kruskal-Wallis test. The effect
size indicates that there is a high possibility that the comparison of A
velocity and S/D between groups differ if the sample size is increased.
It is suggested that further studies include larger samples of patients
with any of the conditions. The strength of the current study was the
assessment of hepatic venous systolic filling fraction in PHT patients
with and without significant RV dysfunction and also remove patients
with severe TR and arrhythmia in our study.