What mechanism explains malabsorption after ileocecal valve resection?

What mechanism explains malabsorption after ileocecal valve resection?

• A. Increases transit time preventing absorption
• B. Decreases transit time and influx of nutrients into the large intestine causing malabsorption
• C. Increases gastric acid production
• D. No effect on absorption

Answer: (B)

Removing the ileocecal valve eliminates the barrier that normally slows flow from the ileum into the colon. Contents move more quickly into the large intestine, so the small intestine has less time to digest and absorb nutrients. This reduced contact time leads to less absorption and contributes to malabsorption. At the same time, more luminal content reaches the colon, which can alter bacterial activity and further worsen malabsorptive patterns. In short, faster transit through the small intestine with increased delivery to the colon explains the malabsorption seen after this resection. Slower transit, gastric acid changes, or no effect on absorption do not fit this mechanism.

Removing the ileocecal valve eliminates the barrier that normally slows flow from the ileum into the colon. Contents move more quickly into the large intestine, so the small intestine has less time to digest and absorb nutrients. This reduced contact time leads to less absorption and contributes to malabsorption. At the same time, more luminal content reaches the colon, which can alter bacterial activity and further worsen malabsorptive patterns. In short, faster transit through the small intestine with increased delivery to the colon explains the malabsorption seen after this resection. Slower transit, gastric acid changes, or no effect on absorption do not fit this mechanism.