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Arterial oxygen saturation at high altitude normal
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The relationship between air pressure and altitude:
In addition to the factors of pressure elevation, there are weather, season, temperature and latitude. The weather can change
Overnight change in air pressure 10mmHg, which is equivalent to between 3500m to 3658m, or 7925m to 8230m between the changes.
The relationship between altitude and air pressure is about the following mathematical formula:
Sea level = 760mmHg is set to standard conditions.
Accordingly,
M above sea level air pressure mmHg
1000670
2000591
3000520
4000460
5000404
6000356
7000314
8000277

P = 760 (e ^ - (a/7924));
P: pressure; e: natural logarithm; a: altitude, meters.
The composition of air from an altitude of approximately, 21% oxygen remained.
Here are some physiological terms:
PaO2: arterial partial pressure of oxygen, mmHg.
PaCO2: arterial carbon dioxide partial pressure, mmHg.
SaO2: arterial blood oxygen saturation,%.
(SvO2: venous blood oxygen saturation,%.)
O2 Content: blood oxygen content
O2 delivery: oxygen through the blood circulation is the amount of absorption and utilization of the organization
PaO2: by air pressure, PaCO2, and body temperature under the pressure of saturated water vapor.
PaCO2: speed controlled by the ventilation.
SaO2: by PaO2, pH, PaCO2, enzymes affected.
O2 Content: hemoglobin concentration and SaO2 (or SvO2) decision.
O2 delivery: (O2 Content artery by vein) multiplied by blood flow.
O2 delivery meets the needs of your organization is the organization's ultimate deciding factor hypoxia.
The following is adapted from a height of 20-40 year-old healthy people get good data:
Elevation and arterial gas analysis: mean (range)
Altitude (m) pressure (mmHg) PaO2 (mmHg) SaO2 (%) PaCO2 (mmHg)
1,646,630 73.0 (65.0-83.0) 95.1 (93.0-97.0) 35.6 (30.7-41.8)
2,810,543 60.0 (47.4-73.6) 91.0 (86.6-95.2) 33.9 (31.3-36.5)
3,660,489 47.6 (42.2-53.0) 84.5 (80.5-89.0) 29.5 (23.5-34.3)
4,700,429 44.6 (36.4-47.5) 78.0 (70.8-85.0) 27.1 (22.9-34.0)
5,340,401 43.1 (37.6-50.4) 76.2 (65.4-81.6) 25.7 (21.7-29.7)
6,140,356 35.0 (26.9-40.1) 65.6 (55.5-73.0) 22.0 (19.2-24.8)
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