Relative blood volume changes during haemodialysis estimated from haemoconcentration markers.

Abstract:

:Relative blood volume (RBV) monitoring is frequently used in haemodialysis patients to help guide fluid management and improve cardiovascular stability. RBV changes are typically estimated based on online measurements of certain haemoconcentration markers, such as haematocrit (HCT), haemoglobin (HGB) or total blood protein concentration (TBP). The beginning of a haemodialysis procedure, i.e. filling the extracorporeal circuit with the patient's blood (with the priming saline being infused to the patient or discarded) may be associated with relatively dynamic changes in the circulation, and hence the observed RBV changes may depend on the exact moment of starting the measurements. The aim of this study was to use a mathematical model to assess this issue quantitatively. The model-based simulations indicate that when the priming saline is not discarded but infused to the patient, a few-minute difference in the moment of starting RBV tracking through measurements of HCT, HGB or TBP may substantially affect the RBV changes observed throughout the dialysis session, especially with large priming volumes. A possible overestimation of the actual RBV changes is the highest when the measurements are started within a couple of minutes after the infusion of priming saline is completed.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pstras L,Waniewski J,Wojcik-Zaluska A,Zaluska W

doi

10.1038/s41598-020-71830-0

subject

Has Abstract

pub_date

2020-09-09 00:00:00

pages

14809

issue

1

issn

2045-2322

pii

10.1038/s41598-020-71830-0

journal_volume

10

pub_type

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