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Hyperoxic ventilation at the critical haematocrit.

Abstract：

OBJECTIVE:During normovolaemic haemodilution arterial O(2)-content decreases exponentially. Nevertheless, tissue oxygenation is first maintained initially by increased organ perfusion and O(2)-extraction. As soon as these compensatory mechanisms are exhausted, myocardial ischaemia and tissue hypoxia occur at an individual 'critical' haematocrit (Hct) value. This study was conducted in order to assess whether tissue hypoxia at the critical Hct is reversed by hyperoxic ventilation with 100% O(2). METHOD:Eighteen anaesthetized pigs were ventilated with room air and were hemodiluted by 1:1 exchange of blood with 6% pentastarch to their individual critical Hct (onset of myocardial ischaemia; significant ECG changes). At the critical Hct, hyperoxic ventilation was initiated. In nine complete datasets, global O(2) delivery and consumption, local tissue O(2) partial pressure (tpO(2)) (MDO-Electrode, Eschweiler, Kiel, Germany) and organ blood flow (microsphere method) in skeletal muscle were analyzed at baseline, after haemodilution to the critical Hct and after 15 min of hyperoxic ventilation. RESULTS:At the critical Hct (7.2+/-1.2%), tpO(2) was reduced from 23+/-3 to 10+/-2 Torr with 50% of all values in the hypoxic range (<10 Torr, all P<0.05). During hyperoxic ventilation, contribution of physically dissolved O(2) to the O(2) delivery and O(2) consumption increased by 400 and 563% (P<0.05) and instantly restored tpO(2) to 18+/-2 Torr, (hypoxic values 25%, P<0.05). CONCLUSION:Hyperoxic ventilation reversed tissue hypoxia at the critical Hct due to preferential utilization of plasma O(2) and allowed temporary preservation of tissue oxygenation. During haemodilution, hyperoxic ventilation might offer an effective bridge until red cells are ready for transfusion.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Kemming GI,Meisner FG,Kleen M,Meier JM,Tillmanns J,Hutter JW,Wojtczyk CJ,Packert KB,Bottino D,Habler OP

doi

10.1016/s0300-9572(02)00408-2

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

289-97

issue

3

eissn

0300-9572

issn

1873-1570

pii

S0300957202004082

journal_volume

56

pub_type

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