Transfusion thresholds may be higher in which scenario?

• A. Active cardiovascular disease
• B. Mild dehydration
• C. Young healthy adults
• D. No anemia

Answer: (A)

The main idea is that transfusion thresholds depend on how well the body's tissues can tolerate reduced oxygen delivery. In active cardiovascular disease, the heart may already be struggling to meet oxygen demand. Anemia lowers the blood’s oxygen content, so the heart must work harder to supply enough oxygen to the myocardium. Because the risk of myocardial ischemia is higher in these patients, clinicians often transfuse at a higher hemoglobin level to maintain adequate oxygen delivery and prevent ischemic injury.

In contrast, dehydration alone doesn't create the same need for higher oxygen-carrying capacity, and young healthy adults have good cardiovascular reserve and tolerate lower hemoglobin better. No anemia means there’s no transfusion need.