Mechanism of lowering of the tissue oxygen partial pressure during hyperoxia and criteria for hyperoxygenation dosage

1982 ◽  
Vol 94 (5) ◽  
pp. 1474-1477
Author(s):  
V. V. Matsynin
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Tissue Oxygen ◽  
Tissue Oxygen Partial Pressure

Tissue oxygen partial pressure in organs of chickens in the second half of embryogenesis and first days after hatching

2014 ◽  
Vol 45 (5) ◽  
pp. 273-279
Author(s):  
V. M. Belichenko ◽  
A. S. Turganbaeva ◽  
E. V. Khodyrev ◽  
L. P. Kislyakova ◽  
Yu. Ya. Kislyakov ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Tissue Oxygen ◽  
Tissue Oxygen Partial Pressure

Microcirculatory Perfusion during Volume Therapy

1995 ◽  
Vol 82 (4) ◽  
pp. 975-982. ◽  
Author(s):  
Wolfgang Funk ◽  
Verena Baldinger
Keyword(s):  
Heart Rate ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Central Venous Pressure ◽  
Venous Pressure ◽  
Tissue Perfusion ◽  
Volume Replacement ◽  
Surface Oxygen ◽  
Tissue Oxygen ◽  
Central Venous

Background Because of the passage of water and salt molecules into the interstitial space, volume replacement with crystalloid solutions requires an amount at least four times that of lost blood. The resulting tissue edema may interfere with nutritive capillary perfusion and oxygen delivery. To prove this hypothesis, the effects of isovolemic hemodilution (hematocrit 30%) with Ringer's lactate solution or dextran 60 on tissue perfusion and oxygenation were investigated in awake Syrian golden hamsters. Methods Experiments were performed by using a chronic dorsal skinfold window giving access to skeletal muscle tissue (musculus cutaneus) with in vivo microscopy, quantitative video image analysis, and surface oxygen partial pressure electrodes. Central venous and arterial pressures were measured by means of chronically implanted jugular venous and carotid catheters. Results Isovolemic exchange of blood with dextran caused no significant changes in arterial or central venous pressure, heart rate, capillary flow velocity, functional capillary density, or surface oxygen partial pressure during the 1-h observation period. A volume of Ringer's solution equal to four times of the amount of blood lost maintained arterial pressure and heart rate when central venous pressure was kept at predilution control values. However, tissue perfusion determined by counting perfused capillaries per terminal arteriole was reduced by 62%, and mean tissue oxygen partial pressure decreased from 19 to 8 mmHg. Conclusions In this model, volume replacement with artificial colloids yielded hemodynamic stability and adequate tissue oxygen supply, whereas administration of crystalloids alone jeopardized tissue perfusion and oxygenation.

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