Mixed Venous Blood Gas Values: Normal PO₂ and PCO₂
Mixed venous blood (sampled from pulmonary artery) reflects systemic oxygen extraction and CO₂ production.
| Parameter | Normal Value | Clinical Significance |
|---|---|---|
| PvO₂ (Mixed Venous PO₂) | 40 mmHg | Reflects balance between O₂ delivery and consumption. Low in shock, sepsis, anemia. |
| PvCO₂ (Mixed Venous PCO₂) | 46 mmHg | Typically 6 mmHg higher than PaCO₂. Widened gradient indicates low cardiac output. |
These values are measured via pulmonary artery catheter (Swan-Ganz) and used in critical care to assess tissue perfusion and guide resuscitation.
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