A patient has a reported SaO₂ of 90%, hemoglobin 15 g%, PaO₂ of 61 mmHg, cardiac output of 6 L/min, and CvO₂ of 14.2 vol%. What would the C(a-v) O₂ equal?

Question

Quizplus · Accepted Answer

C(a-v)O2, or the arterial-venous oxygen content difference, is calculated using the formula: C(a-v)O2 = CaO2 - CvO2, where CaO2 is the arterial oxygen content and CvO2 is the venous oxygen content. Given the information, we first need to calculate CaO2. CaO2 can be approximated using the formula: CaO2 = (Hb * 1.34 * SaO2) + (PaO2 * 0.003), where Hb is hemoglobin in g/dL, SaO2 is the arterial oxygen saturation, and PaO2 is the partial pressure of oxygen in arterial blood in mmHg. Substituting the given values (Hb = 15 g%, SaO2 = 90%, PaO2 = 61 mmHg) into the formula gives CaO2 ≈ (15 * 1.34 * 0.9) + (61 * 0.003) ≈ 18.27 vol%. Then, C(a-v)O2 = CaO2 - CvO2 = 18.27 - 14.2 = 4.07 vol%.

A Patient Has a Reported SaO2 of 90%, Hemoglobin 15

A Patient Has a Reported SaO₂ of 90%, Hemoglobin 15