The half-life of infusion fluids An educational review
2016 (English)In: European Journal of Anaesthesiology, ISSN 0265-0215, E-ISSN 1365-2346, Vol. 33, no 7, 475-482 p.Article, review/survey (Refereed) PublishedText
An understanding of the half-life (T-1/2) of infused fluids can help prevent iatrogenic problems such as volume overload and postoperative interstitial oedema. Simulations show that a prolongation of the T-1/2 for crystalloid fluid increases the plasma volume and promotes accumulation of fluid in the interstitial fluid space. The T-1/2 for crystalloids is usually 20 to 40 min in conscious humans but might extend to 80 min or longer in the presence of preoperative stress, dehydration, blood loss of amp;lt;1 l or pregnancy. The longest T-1/2 measured amounts to between 3 and 8 h and occurs during surgery and general anaesthesia with mechanical ventilation. This situation lasts as long as the anaesthesia. The mechanisms for the long T-1/2 are only partly understood, but involve adrenergic receptors and increased renin and aldosterone release. In contrast, the T-1/2 during the postoperative period is usually short, about 15 to 20 min, at least in response to new fluid. The commonly used colloid fluids have an intravascular persistence T-1/2 of 2 to 3 h, which is shortened by inflammation. The fact that the elimination T-1/2 of the infused macromolecules is 2 to 6 times longer shows that they also reside outside the bloodstream. With a colloid, fluid volume is eliminated in line with its intravascular persistence, but there is insufficient data to know if this is the same in the clinical setting.
Place, publisher, year, edition, pages
LIPPINCOTT WILLIAMS & WILKINS , 2016. Vol. 33, no 7, 475-482 p.
Anesthesiology and Intensive Care
IdentifiersURN: urn:nbn:se:liu:diva-130398DOI: 10.1097/EJA.0000000000000436ISI: 000379343600002PubMedID: 27058509OAI: oai:DiVA.org:liu-130398DiVA: diva2:952705
Funding Agencies|Baxter Healthcare2016-08-152016-08-052016-08-15