Which of the following is NOT TRUE regarding PROPOFOL?
**Core Concept**
Propofol is a short-acting sedative-hypnotic agent used for inducing and maintaining general anesthesia. It is a non-barbiturate, non-benzodiazepine hypnotic that acts on the central nervous system to produce sedation and hypnosis.
**Why the Correct Answer is Right**
Propofol works by enhancing the activity of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA_A receptor, leading to a decrease in neuronal excitability and sedation. Propofol is metabolized by the liver, primarily by the CYP2B6 enzyme, and its active metabolites are excreted in the urine. Propofol has a rapid onset of action and a short duration of action, making it suitable for use in general anesthesia.
**Why Each Wrong Option is Incorrect**
**Option A:** Propofol is not a barbiturate, but it is often used in combination with barbiturates in anesthesia. This statement might be misleading, but it is not entirely false. However, it is not the best answer choice.
**Option B:** Propofol can cause hypotension, particularly with rapid administration or in patients with cardiovascular disease. This statement is true, but it is not the correct answer.
**Option C:** Propofol is NOT a direct inhibitor of the enzyme CYP3A4. In fact, Propofol is primarily metabolized by the CYP2B6 enzyme. This makes option C the correct answer.
**Clinical Pearl / High-Yield Fact**
When using Propofol, it is essential to monitor vital signs closely, especially blood pressure, as it can cause significant hypotension. Additionally, Propofol should be administered slowly and in a controlled manner to minimize the risk of adverse effects.
**Correct Answer:** C. Propofol is NOT a direct inhibitor of the enzyme CYP3A4.