A new technique for the detection of dry weight in hemodialysis patients: Estimated pulmonary capillary wedge pressure. A tissue Doppler imaging study

Background and objective: Fluid overload is an important factor of morbidity and mortality in hemodialysis patients. Today correct determination of dry weight (DW) remains an important issue of hemodialysis practice. Within this context, it is subjected to new method searching. The objective of this study was to calculate estimated pulmonary capillary wedge pressure (ePCWP) with Tissue Doppler Imaging (TDI) in hemodialysis patients and to evaluate its correlation with the other volume markers and to evaluate whether it can be a new method for detection of DW. Materials and methods: Echocardiographic, hemodynamic, and biochemical volume markers of 41 hemodialysis patients were evaluated in the pre- and post-dialysis periods. Patients were divided into two groups based on ePCWP values (Group 1 ePCWP <20 mmHg, Group 2 ePCWP> 20 mmHg). Results: In the pre-dialysis period; parameters related to volume load including ePCWP, systolic blood pressure, mean arterial pressure, pulse pressure, left atrial diameter, left atrial volume, E/e, ratio and E/V-p ratio were statistically significantly higher in Gmup2 compared to Group1. On the other hand, strong correlations were found between pre-dialysis ePCWP and systolic blood pressure, mean arterial pressure, pulse pressure, NT-ProBNP, left atrial diameter, E/e ratio and E/V-p ratio. Conclusions: Strong correlations found between ePCWP which was calculated with TDI and the other volume markers both in pre-dialysis and post-dialysis periods. These findings can provide a significant contribution to routine evaluating of DW in hemodialysis patients. From this aspect, the prediction of ePCWP with TDI can be a new practical and reproducible method for the determination of DW. (C) 2021 Sociedad Espanola de Nefrologia. Published by Elsevier Espana, S.L.U.

Automated summary

This study aimed to evaluate pulmonary capillary wedge pressure (ePCWP) using Tissue Doppler Imaging (TDI) as a potential indicator of dry weight (DW) in hemodialysis patients. The results showed strong correlations between ePCWP and other volume markers in both pre- and post-dialysis periods, suggesting that predicting ePCWP with TDI could be a new practical and reproducible method for determining DW.