What is edema in the context of the cardiovascular system?

What is edema in the context of the cardiovascular system?

• A. The result of unequal pumping of blood, leading to excess fluid in the spaces between cells.
• B. An increase in blood flow to tissues causing redness.
• C. A narrowing of small blood vessels due to plaque.
• D. A collection of fluid within the pericardial sac.

Answer: (A)

Edema is swelling from excess fluid in the spaces between cells. In the cardiovascular context, it often happens when the heart isn’t pumping blood efficiently, so blood backs up in the venous system and capillary hydrostatic pressure rises. This pressure pushes fluid out of capillaries into the surrounding tissue, leading to fluid accumulation in the interstitial spaces. That’s why edema reflects unequal or inadequate pumping, with fluid leaking into tissues, especially in dependent areas. The other options describe different phenomena: redness from increased blood flow to tissue, narrowing of small vessels from plaque (ischemic changes), and a collection of fluid around the heart (pericardial effusion).

Edema is swelling from excess fluid in the spaces between cells. In the cardiovascular context, it often happens when the heart isn’t pumping blood efficiently, so blood backs up in the venous system and capillary hydrostatic pressure rises. This pressure pushes fluid out of capillaries into the surrounding tissue, leading to fluid accumulation in the interstitial spaces. That’s why edema reflects unequal or inadequate pumping, with fluid leaking into tissues, especially in dependent areas.

The other options describe different phenomena: redness from increased blood flow to tissue, narrowing of small vessels from plaque (ischemic changes), and a collection of fluid around the heart (pericardial effusion).