Statistical Analysis
All statistical analyses were performed using SPSS 25 Categoric
variables were summarized as frequencies and percentages and compared
among groups using χ2 or Fisher’s exact test.
Continuous variables were summarized as the mean ± standard deviation.
Differences between groups were assessed using the Mann-Whitney test for
unpaired samples and the Wilcoxon’s test for paired samples. All P
values for statistical analysis were two-tailed, and a P value less than
.05 was considered to indicate a statistically significant difference.
COX multiple regression analysis was used to identify risk factors for
RVF after LVAD implantation. Hemodynamic data obtained during a ramp
test for speed optimization were included as factors for this analysis.
Initially, a univariate analysis was performed; factors with a P value
less than 0.10 were then considered as candidates for a multiple
regression model to identify the risk factors. We used the
receiver-operating characteristic (ROC) curve with the area under the
curve (AUC) analysis to calculate the best cutoff point for Hemodynamic
Index association with RHF. The RVF rate after discharge was estimated
using COX survival analysis.