How is PvO2 calculated?

How is PvO2 calculated?

PvO2 = 5.44D O2/VO2 + 18.16 (8) The relationship between S and PvO2 can be defined by substituting Equation 4 into Equation 1 and solving for PvO2 PvO2 = [21.76/(1-S)] + 18.16 (9) As an example, at a PvO2 of 28 torr (anaerobic threshold), S = -1.2.

What is SvO2 and PvO2?

Abstract. Mixed venous oxygen saturation of hemoglobin (SvO2) and mixed venous oxygen tension (PvO2) may reflect the overall balance between oxygen consumption and delivery.

What does a low pvo2 mean?

If SvO2 decreases, it indicates that the tissues are extracting a higher percentage of oxygen from the blood than normal. In otherwords, a decreased SvO2 indicates that the cardiac output is not high enough to meet tissue oxygen needs.

What causes low pvo2?

There are 4 fundamental causes for a drop in SvO2: The cardiac output is not high enough to meet tissue oxygen needs. The Hb is too low. The SaO2 is too low. Oxygen consumption has increased without an increase in oxgyen delivery.

What is ScvO2 used for?

An ScvO2 refers to a central venous sample. An ScvO2 measurement is a surrogate for the SvO2. It may be used to identify changes in a patient’s tissue oxygen extraction.

How do you measure CvO2?

Mixed venous oxygen content (CvO2) is the amount of oxygen bound to hemoglobin (1.34 * Hb * SvO2) plus the oxygen dissolved in plasma (0.0031 * PvO2). Mixed venous oxygen content equation: CvO2 = (1.34 * Hb * SvO2) + (0.0031 * PvO2).

What is CaO2 and CvO2?

CaO2 = arterial Oxygen Content (mL/dL) CvO2 = mixed venous Oxygen Content (mL/dL)

What is the difference of SaO2 and SpO2?

The mean difference between SpO2 and SaO2 was -0.02% and standard deviation of the differences was 2.1%. From one sample to another, the fluctuations in SpO2 to arterial saturation difference indicated that SaO2 could not be reliably predicted from SpO2 after a single ABG.

What is CvO2 in respiratory?

Mixed venous oxygen content (CvO2) is a fundamental factor to connect cardiac output (Q・ ) and oxygen uptake (V・O2)1-5). The other fundamental factor is arterial oxy- gen content (CaO2). Evaluations of CaO2 and CvO2 are important for the assessment of cardiac and respiratory functions.