An intravenous anaesthetic agent that is associated with hemodynamic stability, maintenance of CVP with post operative nausea, vomiting and myoclonus –
First, the question lists several characteristics: hemodynamic stability, maintenance of CVP (central venous pressure), postoperative nausea and vomiting, and myoclonus. Let's break these down.
Hemodynamic stability suggests the drug doesn't cause significant changes in blood pressure or heart rate. Agents like propofol or etomidate might fit here. Propofol can cause hypotension, so maybe not. Etomidate has minimal effect on hemodynamics, which is a plus. Maintenance of CVP might be related to how the drug affects venous return. If CVP is maintained, perhaps the drug doesn't cause venodilation.
Postoperative nausea and vomiting (PONV) are common with opioids and some anesthetics. Ketamine is known to cause PONV. If the drug in question causes PONV, then maybe it's ketamine. Also, myoclonus is a known side effect of ketamine. So putting this together: ketamine is an intravenous anesthetic that can cause myoclonus and PONV, while maintaining hemodynamics and CVP. Let me check the options. The correct answer is probably ketamine. The other options would be drugs like propofol (causes hypotension), thiopental (no myoclonus), or etomidate (maybe, but etomidate doesn't cause myoclonus). So yes, ketamine fits the description best.
**Core Concept**
The question assesses knowledge of intravenous anesthetic agents, focusing on their hemodynamic effects, adverse reactions, and clinical profiles. Key factors include maintenance of central venous pressure (CVP), postoperative nausea/vomiting (PONV), and myoclonus, which are hallmark features of certain anesthetics.
**Why the Correct Answer is Right**
**Ketamine** is the correct answer. It is a dissociative anesthetic that maintains hemodynamic stability by stimulating sympathetic outflow, preserving cardiac output and CVP. However, it is notorious for causing PONV due to its action on the chemoreceptor trigger zone and sigma-1 receptors. Myoclonus occurs due to NMDA receptor antagonism and increased central nervous system excitability.
**Why Each Wrong Option is Incorrect**
**Option A:** Propofol causes hypotension via venodilation and negative inotropy, lowering CVP. It reduces PONV risk, making it incompatible with the question’s criteria.
**Option B:** Thiopental induces vasodilation, reducing CVP and causing hypotension, contradicting hemodynamic stability.
**Option C:** Etomidate preserves hemodynamics but does not cause myoclonus or PONV, making it inconsistent with the described side effects.
**Clinical Pearl / High-Yield Fact**
Ketamine is a "fight or flight" anesthetic—it maintains blood pressure but causes vivid dreams, PONV, and myoclonus. Use it cautiously in patients with increased intracranial pressure or hypertension. Remember: **Ketamine = Myoclonus + PONV + Hemodynamic stability**.
**Correct