Which components make up oxygen delivery (DO2)?

Oxygen delivery (DO2) is a crucial concept in critical care, reflecting the amount of oxygen that is delivered to the tissues of the body. The main components that make up DO2 include cardiac output (CO), hemoglobin (hgb), and arterial oxygen saturation (SaO2).

In this case, hemoglobin is responsible for carrying oxygen in the blood, while SaO2 indicates the percentage of hemoglobin that is saturated with oxygen. The product of these components illustrates the efficiency of oxygen transportation within the circulatory system. Specifically, oxygen delivery can be quantitatively represented by the formula:

DO2 = CO × (hgb × 1.34 × SaO2 + PaO2 × 0.003)

This shows that the volume of oxygen delivered to tissues is directly related to these parameters. Thus, the correct choice references both SahO2 and hemoglobin along with the essential involvement of cardiac output, as they are directly proportional to the amount of oxygen that can be delivered to the body’s tissues.

Understanding these components illustrates the physiological importance of maintaining adequate hemoglobin levels and ensuring proper oxygen saturation for effective oxygen delivery and prevents tissue hypoxia in critically ill patients.