A patient presents with nephrotic syndrome and hypoalbuminemia. Protein binding of which drug is not affected –
## Core Concept
The patient's condition of nephrotic syndrome and hypoalbuminemia affects the protein binding of certain drugs. This is crucial because many drugs bind to plasma proteins, such as albumin. When albumin levels are low, the free fraction of these drugs increases, potentially altering their efficacy and toxicity.
## Why the Correct Answer is Right
The correct answer, , implies that its protein binding is not significantly affected by low albumin levels. Drugs that are primarily bound to other plasma proteins (like alpha-1 acid glycoprotein) or have a high lipid solubility (and thus distribute extensively into tissues) are less affected by changes in albumin levels.
## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because is highly bound to albumin. With decreased albumin levels, as seen in nephrotic syndrome and hypoalbuminemia, the free fraction of this drug would increase.
* **Option B:** - This option is incorrect for similar reasons as Option A; is also significantly bound to albumin, and its free fraction would increase with hypoalbuminemia.
* **Option D:** - This option is incorrect because is another drug that binds to albumin. Its pharmacokinetics and pharmacodynamics could be altered in the setting of hypoalbuminemia.
## Clinical Pearl / High-Yield Fact
A key point to remember is that in patients with hypoalbuminemia, doses of highly albumin-bound drugs (like warfarin, phenytoin) may need adjustment to prevent toxicity. Drugs with a narrow therapeutic index are particularly concerning in this context.
## Correct Answer: .