If a patient has 3 g% Hb, an SaO₂ of 45%, and a PaO₂ of 525 mm Hg, approximately how much oxygen is being transported to the peripheral tissues in each 100 ml of blood? A) 1.66 vol% O₂ B) 2.31 vol% O₂ C) 3.37 vol% O₂ D) 4.78 vol% O₂ E) 5.43 vol% O₂

Question

Quizplus · Accepted Answer

To calculate the amount of oxygen being transported to the peripheral tissues in each 100 ml of blood, we need to use the formula:

Oxygen content = (Hb x SaO2 x 1.34) + (PaO2 x 0.003)

where Hb is the hemoglobin concentration in grams per 100 ml, SaO2 is the saturation of arterial blood with oxygen, and PaO2 is the arterial oxygen tension in mm Hg.

Plugging in the given values:

Oxygen content = (3 x 0.45 x 1.34) + (525 x 0.003) = 1.145 + 1.575 = 2.72 vol% O2

Therefore, the oxygen being transported to the peripheral tissues in each 100 ml of blood is approximately 2.72 vol% O2. The closest option is 3.37 vol% O2, which is option C.

If a Patient Has 3 G% Hb, an SaO2 of 45

If a Patient Has 3 G% Hb, an SaO₂ of 45