Why is third-spacing observed in pancreatitis?

Why is third-spacing observed in pancreatitis?

• A. Fluid leaks out of cells and collects in the interstitial space.
• B. Digestive enzyme production continues, but secretion is impaired.
• C. Increased blood pressure.
• D. Enhanced renal perfusion.

Answer: (A)

In pancreatitis, inflammation makes the capillaries more permeable, so plasma leaks from the vessels into the interstitial spaces of the pancreas and surrounding areas. This fluid shift into interstitial compartments is what we mean by third-spacing. Because fluid moves out of the vascular space, the circulating blood volume drops even though total body water may be unchanged, leading to edema in tissues and potential hypovolemia. This mechanism directly explains why third-spacing occurs in pancreatitis. The other ideas don’t address this fluid redistribution: continuing enzyme production isn’t about where fluid goes, a rise in blood pressure wouldn’t drive fluid into interstitial spaces, and increased renal perfusion would tend to move fluid out rather than into third spaces.

In pancreatitis, inflammation makes the capillaries more permeable, so plasma leaks from the vessels into the interstitial spaces of the pancreas and surrounding areas. This fluid shift into interstitial compartments is what we mean by third-spacing. Because fluid moves out of the vascular space, the circulating blood volume drops even though total body water may be unchanged, leading to edema in tissues and potential hypovolemia. This mechanism directly explains why third-spacing occurs in pancreatitis.

The other ideas don’t address this fluid redistribution: continuing enzyme production isn’t about where fluid goes, a rise in blood pressure wouldn’t drive fluid into interstitial spaces, and increased renal perfusion would tend to move fluid out rather than into third spaces.