Define ischemia.

Define ischemia.

• A. Oxygen deprivation to cells (hypoxia) due to decreased arterial circulation to the area.
• B. Excess oxygen delivery to tissues.
• C. Inflammation due to infection.
• D. Cell swelling due to electrolyte imbalance.

Answer: (A)

Ischemia is about insufficient blood flow to a tissue, leading to inadequate oxygen delivery to the cells. It happens when arterial circulation to the area is reduced, so even though oxygen may be present in the blood, the tissue isn’t getting enough to meet its metabolic needs. This reduced perfusion can cause hypoxia at the cellular level and, if prolonged, can lead to cellular injury or death. Excess oxygen delivery isn’t ischemia, though it describes a different situation. Inflammation from infection is a distinct process driven by the immune response. Cell swelling from electrolyte imbalance describes edema or cellular swelling, not a failure of blood flow to supply oxygen.

Ischemia is about insufficient blood flow to a tissue, leading to inadequate oxygen delivery to the cells. It happens when arterial circulation to the area is reduced, so even though oxygen may be present in the blood, the tissue isn’t getting enough to meet its metabolic needs. This reduced perfusion can cause hypoxia at the cellular level and, if prolonged, can lead to cellular injury or death.

Excess oxygen delivery isn’t ischemia, though it describes a different situation. Inflammation from infection is a distinct process driven by the immune response. Cell swelling from electrolyte imbalance describes edema or cellular swelling, not a failure of blood flow to supply oxygen.