Blood Factors Influencing O2 Transport at High Altitude

2015 ◽  
pp. 226-229
Author(s):  
Klaus D. J�rgens ◽  
Manfred Pietschmann ◽  
Heinz Bartels
Keyword(s):  
High Altitude ◽  
Factors Influencing ◽  
O2 Transport ◽  
Blood Factors

FACTORS INFLUENCING THE INDIVIDUAL EFFECTS OF BLOOD TRANSFUSIONS ON O2 TRANSPORT AND O2 CONSUMPTION

1998 ◽  
Vol 89 (Supplement) ◽  
pp. 454A ◽  
Author(s):  
Mattias Casutt ◽  
Burkhardt Seifert ◽  
Thomas Pasch ◽  
Edith R. Schmid ◽  
Marko I. Turina ◽  
...  
Keyword(s):  
Blood Transfusions ◽  
O2 Consumption ◽  
Factors Influencing ◽  
O2 Transport ◽  
Individual Effects ◽  
The Individual

Internal carotid and vertebral arterial flow velocity in men at high altitude

1987 ◽  
Vol 63 (1) ◽  
pp. 395-400 ◽  
Author(s):  
S. Y. Huang ◽  
L. G. Moore ◽  
R. E. McCullough ◽  
R. G. McCullough ◽  
A. J. Micco ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
High Altitude ◽  
Flow Velocity ◽  
Sea Level ◽  
Internal Carotid ◽  
Hemoglobin Concentration ◽  
Subsequent Increase ◽  
O2 Transport ◽  
Flow Velocities

Cerebral blood flow increases at high altitude, but the mechanism of the increase and its role in adaptation to high altitude are unclear. We hypothesized that the hypoxemia at high altitude would increase cerebral blood flow, which would in turn defend O2 delivery to the brain. Noninvasive Doppler ultrasound was used to measure the flow velocities in the internal carotid and the vertebral arteries in six healthy male subjects. Within 2–4 h of arrival on Pikes Peak (4,300 m), velocities in both arteries were slightly and not significantly increased above sea-level values. By 18–44 h a peak increase of 20% was observed (combined P less than 0.025). Subsequently (days 4–12) velocities declined to values similar to those at sea level. At altitude the lowest arterial O2 saturation (SaO2) and the highest end-tidal PCO2 was observed on arrival. By day 4 and thereafter, when the flow velocities had returned toward sea-level values, hemoglobin concentration and SaO2 were increased over initial high-altitude values such that calculated O2 transport values were even higher than those at sea level. Although the cause of the failure for cerebral flow velocity to increase on arrival is not understood, the subsequent increase may act to defend brain O2 transport. With further increase in hemoglobin and SaO2 over time at high altitude, flow velocity returned to sea-level values.

ERYTHROCYTE REINFUSION ALTERS SYSTEMIC O2 TRANSPORT DURING EXERCISE AT HIGH ALTITUDE

1995 ◽  
Vol 27 (Supplement) ◽  
pp. S109
Author(s):  
A. J. Young ◽  
M. N. Sawka ◽  
R. Boushel ◽  
S. R. Muza ◽  
B. Freund ◽  
...  
Keyword(s):  
High Altitude ◽  
O2 Transport

Contrast of Filament Bright Rims

1994 ◽  
Vol 144 ◽  
pp. 365-367
Author(s):  
E. V. Kononovich ◽  
O. B. Smirnova ◽  
P. Heinzel ◽  
P. Kotrč
Keyword(s):  
High Altitude ◽  
Line Profile ◽  
Line Center ◽  
Magnetic Structures ◽  
The Mean

AbstractThe Hα filtergrams obtained at Tjan-Shan High Altitude Observatory near Alma-Ata (Moscow University Station) were measured in order to specify the bright rims contrast at different points along the line profile (0.0; ± 0.25; ± 0.5; ± 0.75 and ± 1.0 Å). The mean contrast value in the line center is about 25 percent. The bright rims interpretation as the bases of magnetic structures supporting the filaments is suggested.

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