What question did this study set out to answer?

To evaluate whether hyperoxic ventilation compensates for acute normovolemic hemodilution-induced anemia and identify the hemoglobin threshold at which its therapeutic benefits cease.

February 1, 1998Transfusion

Effects of hyperoxic ventilation on hemodilution‐induced changes in anesthetized dogs

View Full Paper

Ask AI

Bookmark

Authors

OHO. HäblerLinköping University MKM. KleenBMW (Germany)JHJ. HütterBMW (Germany)

Discussion

Member takes

Implication

Experimental study demonstrates that hyperoxic ventilation improves tissue oxygenation during acute normovolemic hemodilution in anesthetized dogs, suggesting delayed need for blood transfusion.

Key Points

To evaluate whether hyperoxic ventilation compensates for acute normovolemic hemodilution-induced anemia and identify the hemoglobin threshold at which its therapeutic benefits cease.
Anesthetized dogs (N=22) ventilated with room air underwent acute normovolemic hemodilution (ANH) to a target hemoglobin concentration of 7 g/dL, followed by hyperoxic ventilation (FiO2 1.0).
Systemic hemodynamics, left ventricular pressure-volume relationships, and tissue oxygenation in the liver and skeletal muscle were continuously recorded.
A subgroup of dogs (n=7) underwent additional progressive hemodilution under 100% oxygen to determine the critical hemoglobin concentration where hyperoxic benefits were abolished.
Hyperoxic ventilation fully reversed the hemodilution-induced increase in cardiac index (4.6 ± 0.7 vs. 3.8 ± 0.9 L/min/m2; p < 0.05) and partially restored systemic vascular resistance (1784 ± 329 vs. 2087 ± 524 dyn·s/cm5·m2; p < 0.05).
Tissue oxygenation increased significantly across mixed venous (40 ± 3 to 59 ± 7 torr; p < 0.05), coronary venous (30 ± 4 to 43 ± 6 torr; p < 0.05), liver (31 ± 11 to 39 ± 13 torr; p < 0.05), and skeletal muscle beds (30 ± 14 to 41 ± 22 torr; p < 0.05).
Physically dissolved plasma oxygen increased its contribution to whole-body oxygen consumption from 6 ± 1% to 47 ± 8% (p < 0.05) and myocardial consumption from 4.3 ± 0.9% to 31 ± 6% (p < 0.05), with protective effects lost below 5.6–5.8 g/dL hemoglobin.

Cite This Study

Häbler et al. (1998) studied this question.

synapsesocial.com/papers/6a7f4e3a0ae97466a48963cb https://doi.org/10.1046/j.1537-2995.1998.38298193095.x

View Full Paper

Ask AI

Bookmark

Implication

Experimental study demonstrates that hyperoxic ventilation improves tissue oxygenation during acute normovolemic hemodilution in anesthetized dogs, suggesting delayed need for blood transfusion.

Effects of hyperoxic ventilation on hemodilution‐induced changes in anesthetized dogs

Discussion

Member takes

Implication

Key Points

Cite This Study

Effects of hyperoxic ventilation on hemodilution‐induced changes in anesthetized dogs

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider