Dynamics of vascular refilling in extended nocturnal hemodialysis.
absolute blood volume
hemodialysis
vascular refilling
volume management
Journal
Hemodialysis international. International Symposium on Home Hemodialysis
ISSN: 1542-4758
Titre abrégé: Hemodial Int
Pays: Canada
ID NLM: 101093910
Informations de publication
Date de publication:
10 2022
10 2022
Historique:
revised:
06
04
2022
received:
19
11
2021
accepted:
30
05
2022
pubmed:
18
6
2022
medline:
6
10
2022
entrez:
17
6
2022
Statut:
ppublish
Résumé
Long dialysis treatments are generally assumed to mitigate the ultrafiltration (UF) induced volume perturbation and to improve vascular refilling because of reduced UF rates and sufficient time for volume re-equilibration. The time course of vascular refilling was therefore examined during extended nocturnal dialysis. For each hour of dialysis, vascular refilling volume was calculated from the absolute blood volume changes and UF volume removed. Absolute blood volume was estimated by indicator dilution at the beginning of dialysis and then tracked with a relative blood volume monitor. The refilling fraction was defined as the ratio of refilling volume to UF volume. Ten stable chronic hemodialysis (HD) patients were studied during extended (7 h) nocturnal treatment sessions. Specific UF rate was 4.8 ± 1.8 ml/kg/h. In the 1 h, refilling volume amounted to only 23% of UF volume. Thereafter, refilling fraction steeply increased and reached maximum values in the 2, 3 and 4 h at about mean 90% (91.5%, 88.7%, and 91.1% respectively). From the 5 h on, refilling volume decreased (5 h 81.3%, 6 h 72.5%, 7 h 70.0% of UF volume). Cumulative refilling reached 73.6% of UF volume after 4 h of treatment time. This did not change during the further course of HD. Cumulative refilling volume showed a strong correlation (r = 0.94; p < 0.001) with UF volume. The ratio of blood volume to extracellular volume (R In spite of low-UF rates and extended treatment times, overall refilling fraction reached only 74% and was not different from the refilling fraction observed in regular HD. This value seems to represent a point where UF-induced volume perturbation is adequately compensated by physiologic control mechanisms.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
540-547Informations de copyright
© 2022 International Society for Hemodialysis.
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