Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-11-14
pubmed:abstractText
Improvements in hemoglobin-based oxygen-carrying (HBOCs) solutions have overcome the toxicities that plagued earlier efforts. However, limitations of the efficacy of HBOCs are emerging. The potential limitations of an HBOC were studied in an ovine model (n = 6) of exchange transfusion. Hemodynamic, oxygen transport, and hemoglobin kinetic parameters were examined during isovolumic blood exchange to a final hematocrit of 3.2 +/- 0.7% and a plasma hemoglobin concentration of 8.1 +/- 0.4 g/dl while sheep were awake and breathing room air. However, the infusion of HBOC was associated with immediate increases in systemic and pulmonary arterial pressures. Despite hemodilution with HBOC, systemic and pulmonary vascular resistance increased 43.9% (P < 0.001) and 204.2% (P < 0.001), respectively, after HBOC infusion. After blood exchange, the plasma hemoglobin level exhibited a circulatory half-life of 52.7 +/- 18.0 h. The formation of methemoglobin was significant, accounting for 33.0 +/- 7.1% of the total circulating plasma hemoglobin at 24 h; the half-life of HBOC capable of carrying oxygen was 30.1 +/- 5.4 h. This relatively short period of oxygen-carrying efficacy and the observed vasoconstriction properties may constrain the potential applications of HBOC solutions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
8750-7587
pubmed:author
pubmed:issnType
Print
pubmed:volume
79
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
236-42
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Limitations of the efficacy of hemoglobin-based oxygen-carrying solutions.
pubmed:affiliation
Department of Surgery, Massachusetts General Hospital, Boston, USA.
pubmed:publicationType
Journal Article