In:
The International Journal of Artificial Organs, SAGE Publications, Vol. 33, No. 8 ( 2010-08), p. 544-552
Abstract:
Hypoxemia and acidemia (hypoxemia/acidemia) are serious complications in the critically ill and often occur in unstable patients exposed to extracorporeal organ support. Still, little is known about the biocompatibility interactions of hypoxemia/acidemia with extracorporeal circuits (ECC). Existing animal models often include the release of mediator cascades (sepsis-, lung injury models) or are based on small laboratory animals. We established a porcine model of hypoxemia/acidemia without an underlying disease and further challenged the situation with an extracorporeal circuit (ECC). Methods Hypoxemia/acidemia were induced (3.5 h) and maintained (3 h) in anesthetized pigs (40 kg) by a stepwise reduction in oxygenation, infusion of 0.4 mol·l −1 lactic and hydrochloric acid and by low tidal volume ventilation, targeting an P a O 2 〈 70 mmHg, S v O 2 〈 65%, pH ~ 7.2. Venovenous hemofiltration (CVVH) operated in recirculation mode without volume exchange was chosen to prove the suitability of the model for studies on ECCs under clinical conditions (ECC group, n=6). Another 6 animals underwent the same protocol except for the CVVH (reference group, n=6). Results The median P a O 2 during hypoxemia/acidemia was 62 mmHg, the median S v O 2 was 38%, and the median pH was 7.22. Hypoxemia/acidemia was successfully induced and maintained for 6.5 h in all pigs. CVVH could be performed for 3 h with blood flow rates up to 300 ml·min −1 and filtrate rates up to 60 ml·min −1 . Conclusions Our model provides hypoxemia/acidemia with blood gas values comparable to critically ill adult patients for several hours, during which it is possible to perform CVVH. Thus, it enables research on the biocompatibility reactions of extracorporeal circuits under intensive care conditions.
Type of Medium:
Online Resource
ISSN:
0391-3988
,
1724-6040
DOI:
10.1177/039139881003300805
Language:
English
Publisher:
SAGE Publications
Publication Date:
2010
detail.hit.zdb_id:
1474999-3
