Summary:
The objective of the work was to evaluate the results of sonographic examination of the diameter
of the vena cava inferior (VCI) as a parameter of hydratation of haemodialyzed patients.
In a group of 84 haemodialyzed patients, mean age 66.32 years, the collapsibility index of the IVC
was measure. The collapsibility index (CI) was calculated according to the formula:
CI (%)= IVCexp - IVCinsp/IVCexp x100,
where IVCexp = the maximum diameter of the IVC in maximum inspiration. Values of the index
within the range from 40-75% corresponded to normal hydratation. The results were compared
with ultrafiltration (total and expressed as % of body weight after haemodialyzation), „dry“ body
weight and with changes of BP during haemodialysis.
The mean value of CI was 63.24 ± 18.54. In 54 instances it was within the normal range (62.26 ±
11.4), in 10 it was lower (27.7 ± 6.02; possible sign of inadequate ultrafiltration during dialysis) and
in 20 instances it was higher (84.9 ± 7.53; risk of excessive ultrafiltration).
Clinically assessed „dry“ weight was adequate in 64 % cases. In 24 % UF was excessive. With this
corresponded also the incidence of hypotension (40 %) and in these patients the „dry“ weight was
subsequently elevated. The predictive importance of low values of CI for inadequate UF is how-
ever not unequivocal. Some of these patients were hypotensive even in case of low UF and did not
tolerate its increase.
Key words:
Haemodialysis - Ultrafiltration in haemodialysis - Optimal „dry“ weight- Vena cava
inferior - Collapsability index
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