Resection of 90% of the ileum and jejunum causes all the following except –
**Core Concept**
The question tests understanding of short bowel syndrome, a condition resulting from significant resection of the small intestine, including the **ileum** and **jejunum**. This syndrome leads to malabsorption due to reduced surface area for nutrient absorption. The small intestine plays a crucial role in absorbing nutrients, vitamins, and minerals.
**Why the Correct Answer is Right**
Since the correct answer options are not provided, let's discuss the general effects of resecting 90% of the ileum and jejunum. Such a resection would lead to severe malabsorption, including fat-soluble vitamins (**Vitamins A, D, E, K**), **bile salts**, and **essential nutrients**. The **ileum** is specifically important for the absorption of **vitamin B12** and **bile salts**.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, we can't directly address why it's incorrect, but generally, options related to malabsorption of specific nutrients or vitamins would be expected consequences.
**Option B:** Similarly, without specifics, we can infer that any option suggesting no impact on nutrient absorption would be incorrect.
**Option C:** This would likely be incorrect if it suggested no effect on fluid and electrolyte balance, as short bowel syndrome can lead to **diarrhea** and subsequent electrolyte imbalances.
**Option D:** If this option suggested no need for **parenteral nutrition**, it would be incorrect, as patients with significant small intestine resection often require supplemental nutrition.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **ileum** is crucial for **vitamin B12** absorption, and its resection can lead to **pernicious anemia** if not managed properly. Patients with short bowel syndrome require close monitoring and management of their nutritional status.
**Correct Answer:**