Influence of parenteral nutrition on blood rheology and platelet aggregation in vitro.

Abstract:

BACKGROUND:Parenteral nutrition (PN) is a hyperosmolar solution composed of glucose, amino acids and a lipid emulsion, which is often used despite well-known side effects and complications. OBJECTIVES:In this study the hypothesis was tested that PN could affect hemorheology. METHODS:The influence of increasing plasma concentrations (0, 4, 10 and 25%) of the 3-in-1-mixture of PN on various rheological parameters were studied in vitro. The influence of the individual components was studied with plasma concentrations of 10, 10 and 5%, respectively. Hematological and coagulation tests were performed. Blood viscosity and red blood cell (RBC) aggregation were measured and platelet aggregation in flowing blood was assessed with a PFA-100 instrument. RESULTS:It was found that PN induced RBC shrinkage, which was partially reversible. It reduced RBC aggregation measured by low shear viscosity or RBC sedimentation. Platelet aggregation was strongly inhibited. Coagulation tests were not affected. Investigations with the single components of PN showed that the RBC shrinkage was mainly caused by the amino acid solution and the inhibition of platelet aggregation by all 3 components. The lipid emulsion in higher plasma concentrations led to echinocytosis, indicating that the lipids interact with the outer half of the membrane lipid bilayer. CONCLUSIONS:High concentrations of PN affect blood rheology in several ways. The strongest effect was an inhibition of platelet aggregation, which may have a clinical relevance. Other effects such as RBC shrinkage and decreased RBC aggregation occurred only at high PN concentrations, which are reached in vivo at the infusion site.

journal_name

Biorheology

journal_title

Biorheology

authors

Compagnoni SC,Schulzki T,Thoeny S,Reinhart WH

doi

10.3233/BIR-140652

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

187-96

issue

2-3

eissn

0006-355X

issn

1878-5034

pii

P878UG3354888817

journal_volume

51

pub_type

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