Which drug of anesthetics causes delirium & hallucination
**Core Concept**
Delirium and hallucinations are severe psychiatric symptoms that can occur as side effects of certain anesthetic agents. This phenomenon is often associated with the use of intravenous anesthetics that affect the central nervous system.
**Why the Correct Answer is Right**
The intravenous anesthetic agent most commonly linked to delirium and hallucinations is ketamine. Ketamine acts as an N-methyl-D-aspartate (NMDA) receptor antagonist, which can lead to dissociative effects and alterations in perception. This is because NMDA receptors play a crucial role in regulating consciousness, memory, and learning. When these receptors are blocked, patients may experience a range of symptoms including confusion, disorientation, and hallucinations.
**Why Each Wrong Option is Incorrect**
* **Option A:** Propofol is a widely used anesthetic agent but is not typically associated with delirium and hallucinations. Instead, it is known for its anti-emetic effects and rapid onset of action. Propofol works by enhancing the activity of gamma-aminobutyric acid (GABA) in the brain, which has a sedative effect.
* **Option B:** Midazolam is a benzodiazepine anxiolytic agent that can cause sedation and amnesia but is not commonly linked to delirium and hallucinations. Midazolam acts by enhancing the activity of GABA, leading to a decrease in neuronal excitability.
* **Option C:** Fentanyl is a potent opioid analgesic that can cause respiratory depression and sedation but is not typically associated with delirium and hallucinations. Fentanyl works by activating opioid receptors in the brain, which can lead to analgesia and euphoria.
**Clinical Pearl / High-Yield Fact**
Ketamine's dissociative effects can be mitigated by co-administering anesthetic agents that enhance its sedative properties, such as propofol or midazolam. However, this should be done with caution, as it can increase the risk of respiratory depression.
**Correct Answer:** C. Ketamine