Oral hypoglycemic which should be stopped prior to surgery under GA:
**Core Concept**
The question tests the understanding of **oral hypoglycemic agents** and their management in the perioperative period, particularly under **general anesthesia (GA)**. It requires knowledge of the pharmacological properties of these agents and their potential interactions with anesthetic agents or surgical stress.
**Why the Correct Answer is Right**
The correct answer is related to the specific oral hypoglycemic agent that needs to be stopped before surgery due to its mechanism of action and potential risks. For instance, **metformin** is often stopped before surgery under GA due to the risk of **lactic acidosis**, especially in patients with renal impairment or when iodinated contrast agents are used.
**Why Each Wrong Option is Incorrect**
**Option A:** May not be the correct choice if it refers to a short-acting oral hypoglycemic that does not significantly increase the risk of hypoglycemia or other complications under GA.
**Option B:** Similarly, if this option refers to an agent like **glipizide**, which has a shorter duration of action, it might not be the primary concern for discontinuation before surgery.
**Option D:** Could be incorrect if it represents an oral hypoglycemic agent that is considered safe to continue in the perioperative period.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **metformin** should be withheld before surgery under GA, especially if there's a risk of acute kidney injury or the use of contrast media, to prevent lactic acidosis. This is a critical consideration for patient safety.
**Correct Answer:** D. Metformin.